SPARC Forum

Tech => Progress Reports => Topic started by: RevRobots on February 05, 2015, 07:51:40 pm

Title: Revelation Robotics
Post by: RevRobots on February 05, 2015, 07:51:40 pm
Hello All,
This is my plunge into the SPARC forum.
Here are my bots:
Sky Rocket
 (http://buildersdb.com/botpics/thumbs/9677.jpg)
Status: Complete, Record: 4-6, Weapon: Servo Lifter, Competitions: Bot Blast 2014 0-2, and Franklin Institute 2014 2-2, Motorama 2015 2-2, Upcoming Competitions: None
Cornerstone,
 (http://buildersdb.com/botpics/thumbs/9843.jpg)
Status: Complete, Record 17-8, Weapon: Wedge, Competitions Motorama 2015 2-2, Spring Fling 2015 3-2, Bot Blast 2015 3-2, Barn Battles 2015 5-0, Fall Brawl 2015 4-2. Upcoming Competitions: Motorama 2016 Titles: Motorama 2015 Antweight Rumble Champion, 3rd place at Spring Fling 2015, 2nd place at Fall Brawl 2015, And 1st Place at Barn Battles 2015.
The Ophidian,
(http://buildersdb.com/botpics/thumbs/9902.jpg)
Status: Complete, Record 5-8, Weapon: Spinning dado blade, Competitions: Motorama 2015 3-2, Bot Blast 2015 0-2, Fall Brawl 2015 1-2. Upcoming Competitions: Motorama 2016
Revelation,
(http://buildersdb.com/botpics/thumbs/9916.jpg)
Status: Building, Record 0-0, Weapon: FBS, Upcoming Competitions: none
Arrow,
(http://www.buildersdb.com/botpics/9937.jpg)
Status: Complete, Record 3-5, Weapon: Thwacker, Competitions: Spring Fling 2015 1-2, Barn Battles 2-3. Upcoming Competitions: none
Justice,
(http://www.buildersdb.com/botpics/10021.jpg)
Status: Complete, Record 6-3, Weapon: Overhead bar, Competitions: Bot Blast 2015 2-2, Barn Battles 2015 4-1. Upcoming Competitions: Motorama 2015?
Bulwark,
(http://www.buildersdb.com/botpics/10109.jpg)
Status: Complete, Record 2-3, Weapon: Brutte Force, Competitions: Barn Battles 2015 2-3, Fall Brawl 2015 1-2. Upcoming Competitions: None
Any questions?

Adam
Revelation Robotics
Title: Re: Revelation Robotics
Post by: Koolaid64 on February 05, 2015, 08:15:34 pm
(http://i.imgur.com/9ULzIZc.png)
Title: Re: Revelation Robotics
Post by: RevRobots on February 05, 2015, 08:44:07 pm
Thanks Kyle.

I will work on the pics right away.

Adam
Revelation Robotics
Title: Re: Revelation Robotics
Post by: RevRobots on February 06, 2015, 03:00:57 pm
I couldn't get it to work. Oh well here are the buildersdb pics:

Sky Rocket:

http://www.buildersdb.com/botdetails.asp?eventid=395&BotID=9677.jpg

Cornerstone:

http://www.buildersdb.com/botdetails.asp?eventid=395&BotID=9843.jpg

The Ophidian:

http://www.buildersdb.com/botdetails.asp?eventid=&BotID=9902.jpg

Revelation (shell):

http://www.buildersdb.com/botdetails.asp?eventid=&BotID=9916.jpg

Sorry for the bad pic of The Ophidian, I'll have a new one up soon.
Here is my old thread http://forums.delphiforums.com/cjrc/messages/?msg=3553.1, I think it will answer some of your questions.

Adam
Revelation Robotics
Title: Re: Revelation Robotics
Post by: Koolaid64 on February 06, 2015, 05:18:49 pm
use the link that takes you to only the picture http://www.buildersdb.com/botpics/9677.jpg
(http://www.buildersdb.com/botpics/9677.jpg)
Title: Re: Revelation Robotics
Post by: zacodonnell on February 06, 2015, 05:27:53 pm
That's a lot of bots to make in a short time.  How many are you expecting to actually run at Motorama this year?
Title: Re: Revelation Robotics
Post by: RevRobots on February 07, 2015, 06:09:33 pm
Hi Zac,

We are planing to run 3 robots: Sky Rocket, Cornerstone, and The Ophidian. And I am going to hopefully bring Revelation as a grudge bot.

All,

Here is a pic of Revelation. It uses servo drive, and a cake pan for a spinner.

(https://revelationrobotics.files.wordpress.com/2015/02/img_0009.jpg?w=300&h=225)

Any questions or coments?

Adam
Revelation Robotics
Title: Re: Revelation Robotics
Post by: RevRobots on February 10, 2015, 04:18:31 pm
Hello All,

Yesterday I got the BESC for Revelation. I tested it and with the brushless, and it works very nicely. The only problem is that I put the shell on and brought it outside to test it and the motor seems to be over-loaded. :(

I will have to test it out on different voltages. I may have to run it on a 9v battery. But overall I'm very happy with the first test, the drive system worked nicely and the shell looked very balanced. It is also only about 1oz. over-weight. Once I get it working I'll post a test video.

Adam
Revelation Robotics
Title: Re: Revelation Robotics
Post by: RevRobots on February 11, 2015, 03:27:47 pm
Hello All,

I am having more trouble with Revelation (shell spinner). When I power up the brushless motor with the shell attached, the shell spins very slowly.  But, when I remove the shell, the brushless gets up to speed easily.  I tried attaching my brother's 2 oz. dado blade instead of the 6 oz. shell spinner, but that didn't make any difference.  I tried leveling up the battery voltage from 7.4v, to a 9v, to two 9v. That didn't work. Then I tried taking the servo drive off of the full voltage. That didn't work either. :(

So I'm out of ideas, do you guys have any? Here are the specs. for the motor and ESC.
http://www.hobbyking.com/hobbyking/store/__18967__D2822_17_Brushless_Outrunner_1100kv.html
http://www.hobbyking.com/hobbyking/store/__2161__TURNIGY_Plush_12amp_2A_BEC_BESC.html

Adam
Revelation Robotics
Title: Re: Revelation Robotics
Post by: Koolaid64 on February 11, 2015, 03:38:50 pm
bump up to a  18 amp controller (http://www.hobbyking.com/hobbyking/store/__4312__TURNIGY_Plush_18amp_Speed_Controller.html) also try to belt drive it with about a 3:1 ratio just to make it easier on the motor to spin up.
Title: Re: Revelation Robotics
Post by: zacodonnell on February 11, 2015, 06:39:51 pm
When you say it doesn't work, what does it do? Does it fail to spin at all, spin slowly, get really hot, shoot flames out (I hope not!)?

If it is just spinning very slowly it could be your battery can't source the current you need. two 9v batteries together might be able to source enough for a little while but the 7.4v lipo is more likely to work.  Does any part of the system get hot?

-Zac
Title: Re: Revelation Robotics
Post by: RevRobots on February 13, 2015, 08:04:06 am
Zac,

The brushless motor spins very slowly, I mean Slice slow. No I don't think any part of the system gets hot.

@Kyle,
Thanks for the suggestion. I guess Revelation will be there for show & tell.

All,
This is my one year anniversary of building Combat Robots!:D
It all started out with Destructor.

(https://revelationrobotics.files.wordpress.com/2015/02/img_1157.jpg)

 I happened to be building him during Moto' last year without knowing it. And yes, he is made out of wood and cardboard, but it had servo switch control and some speedy gearboxes.
Thanks for all of the advice! :D

Adam
Revelation Robotics
Title: Re: Revelation Robotics
Post by: zacodonnell on February 13, 2015, 06:00:25 pm
Zac,

The brushless motor spins very slowly, I mean Slice slow. No I don't think any part of the system gets hot.


Could you possibly take a video of it spinning without the shell and with the shell using the 7.4v lipo? That should help us diagnose it. What you describe sounds like it might be a battery problem. What is the capacity (in mah) of your lipo pack?  Do you know the C rating? A link to the battery would work too.

-Zac
Title: Re: Revelation Robotics
Post by: RevRobots on February 15, 2015, 03:56:29 pm
Hi Zac,

Here are the specs. 7.4v Lipo, 460mAh, and 20c. Here is the link. http://www.fingertechrobotics.com/proddetail.php?prod=R-2S-mAh

Also here is a video:

https://vimeo.com/119694592

Any Last minute suggestions? Because I want to call a hobby shop that is (relatively) close to me to see if they have the 18 amp controller that Kyle mentioned.

Adam
Revelation Robotics
Title: Re: Revelation Robotics
Post by: Koolaid64 on February 15, 2015, 04:26:19 pm
It may just be to much load on the motor/controller. I had the turnigy 12amp in brisinger at franklin and the startup was awful so I switched back to the 18amp. I think its just a timing issue with the software. 
Title: Re: Revelation Robotics
Post by: zacodonnell on February 15, 2015, 05:13:08 pm
Here are the specs. 7.4v Lipo, 460mAh, and 20c. Here is the link. http://www.fingertechrobotics.com/proddetail.php?prod=R-2S-mAh

That battery can only support a 14A burst, so going from a 12A controller to a 18A controller isn't likely to help much. If nothing is getting warm then you're probably not stressing the battery or controller, meaning you aren't drawing too much current.

That sound you hear when it is trying to start up doesn't sound good. It sounds like the controller is unable to stay in sync with the motor. That either means the timing settings on the controller need to be adjusted or there is something preventing them from working together well. My best guess is that you have a bad solder joint between the motor and controller. I had this problem on a couple of my bots before I got better at soldering and it can manifest like this.

I originally thought you may just be asking more of that motor than it is capable of providing. Because it is 1100 RPM/v you're asking it to spin that 6 oz shell at around 8000 RPM, which I thought seemed a little high for a 100 watt peak motor and 6 ounce shell to me.  A quick guess at the dimensions of the shell and some time with the team cosmos KE calculator (http://www.teamcosmos.com/ke/ke.shtml) make me think that's about a 230 joule energy storage. 1 joule = 1 watt for 1 second, so 230 joules should be about 100 watts for 2.3 seconds. Assuming you'll have some losses because this is the real world, I'd still only expect 2-3 or maybe 4 seconds to spin up if you could actually put 100 watts into it for that long. Because of this, and the video you showed, I think that you are not getting the rated amount out of that motor. The motor or controller might be defective or the wiring in between. My bet is the wiring.

I'm planning to be at the competition friday morning to help set everything up. If you want, I might be able to help you with troubleshooting this bot in person. It'd likely be too late to actually enter it but we could try.  If you are hoping to enter it you'll have to get rid of that extra weight this week.

-Zac
Title: Re: Revelation Robotics
Post by: zacodonnell on February 15, 2015, 05:25:51 pm
I just threw a spare 40A brushless controller in that we can test with at the event if we need to. It'll likely be too heavy for your needs but probably ok if you end up doing a grudge match with the bot.

Make sure you practice turning the bot on and off, doing the safety inspection, and charging your batteries.  A mock safety inspection is an easy thing to do at home and will let you work on fixing any problems you run into without the pressure of running out of time. You already are watching your weight, which is a great start, but you need to make sure you do a failsafe test too now that many of your bots have active weapons. 

Also make sure you make a check list for all the parts and tools you need to bring with you so you don't forget anything. I've been building bots for a while but I still found a few things I forgot when I was packing today that my checklist reminded me of.

-Zac
Title: Re: Revelation Robotics
Post by: RevRobots on February 16, 2015, 05:09:03 pm
Thanks Zac, :)

The plan was to have him as a grudge bot anyway. It looks like there are a lot of grudge bots coming. Should I get another battery? I also just made a parts & tool list. FYI the brushless and ESC have gold bullet connectors on them. I will also bring a Multi-meter.

Adam
Revelation Robotics
Title: Re: Revelation Robotics
Post by: Koolaid64 on February 16, 2015, 05:42:41 pm
you can still enter him you will just have to pay the fee. the paperwork for builders is what has to be done way in advance.
-Kyle
Title: Re: Revelation Robotics
Post by: zacodonnell on February 16, 2015, 06:34:04 pm
did the controller and motor both come with the bullets already attached? If so, it probably isn't a problem with your soldering after all.  Does your multimeter let you measure current up to around 10A or is it one that only does very small current? Would be interesting if you could measure the current during spinup on any one of the three motor leads. Maybe put the shell on upside down so you can measure it and have the shell weight on.

-Zac
Title: Re: Revelation Robotics
Post by: Badnik96 on February 16, 2015, 06:38:47 pm
It could still be a faulty solder. I've had issues with the connectors on hobbyking motors before. try re-soldering them if you can.
Title: Re: Revelation Robotics
Post by: RevRobots on February 17, 2015, 06:29:46 pm
Kyle,

I don't want to enter Revelation into the real competition, he will probably get destroyed. Plus running 4 robots at Motorama will be a nightmare. Also a grudge bot is just fun. Are you bringing Ladybug?

Zac and Dylan,

The Motor came with connectors already but I soldered the ESC connectors on. I will try re-soldering them as soon as possible

All,

Here is a pre-Motorama update:

Sky Rocket

(https://revelationrobotics.files.wordpress.com/2015/02/img_0002.jpg)

I installed a FingerTech power switch, and made a full wedge from leftover titanium. But besides that it is unchanged from the last time it competed.

Cornerstone

(https://revelationrobotics.files.wordpress.com/2015/02/img_0604.jpg)

I also installed a FingerTech power switch in Cornerstone. My Mom also did the name on the front.

The Ophidian

(https://revelationrobotics.files.wordpress.com/2015/01/img_0089.jpg)

The first (real) spinner Revelation Robotics has entered into a competition. This should be fun.

And you all know where Revelation is at the moment.

Adam
Revelation Robotics
Title: Re: Revelation Robotics
Post by: Koolaid64 on February 17, 2015, 06:42:52 pm
I won't be bringing lady bug because I was trying to save some money on reg cost.
your pics are nice but they need some re-sizing

add width=800  to the first part of the img code like this
[img width=800]

-Kyle
Title: Re: Revelation Robotics
Post by: RevRobots on February 18, 2015, 07:04:43 pm
Hello All,

Mwahahahah! It works!

https://vimeo.com/119997411

I re-soldered the bullet connecters on the brushless and by golly, the darn thing works. :D
YAY!!!

Adam
Revelation Robotics
Title: Re: Revelation Robotics
Post by: Koolaid64 on February 18, 2015, 07:18:38 pm
Good to hear.
Title: Re: Revelation Robotics
Post by: zacodonnell on February 18, 2015, 07:52:11 pm
I re-soldered the bullet connecters on the brushless and by golly, the darn thing works. :D
YAY!!!

Way to go on getting it running! Your shell is more balanced than I expected.  It's still making sounds that I think are a little odd but it's a definite improvement.  If you want I will try to take a look at the solder joints again at the event to see if we can get it really screaming.  The feeling of successfully making that first custom weaponed bot is like nothing else I've ever experienced.

-Zac
Title: Re: Revelation Robotics
Post by: RevRobots on February 19, 2015, 12:53:41 pm
Hello All,

So I put Revelation together last night, and weighed him. He was 1.2oz. over-weight. :P I got him down to .6oz. over-weight by shortening the wires, and getting rid of the connecters. Is .6oz. over-weight ok for a grudge bot? If not, I'll weight (bad pun) for Zac tomorrow morning, to make sure I don't do anything stupid.

See everybody tomorrow!  8) :D

Adam
Revelation Robotics
Title: Re: Revelation Robotics
Post by: zacodonnell on February 19, 2015, 04:45:40 pm
I wouldn't think .6 oz over is going to be a problem for a grudge bot, even in that weight class.  The trick will be getting the other builder(s) to agree to fight you but that shouldn't be hard.

-Zac
Title: Re: Revelation Robotics
Post by: Badnik96 on February 19, 2015, 05:09:58 pm
I'll fight Revelation with FireArrow if it's still in shape after tomorrow's fighting.
Title: Re: Revelation Robotics
Post by: Infernaltank on February 19, 2015, 06:16:11 pm
wait is revolution supposed to be an ant?
Title: Re: Revelation Robotics
Post by: RevRobots on February 24, 2015, 04:56:04 pm
Hi All,

Here is my event report.

     Fight 1: Cornerstone vs. Eleos

The first 5 seconds decided the match. It turned out that I was lower then the viper lifter, and you can fill in the blank.
Cornerstone is 1-0 :)
https://www.youtube.com/watch?v=zjboyinX-Is&spfreload=10

     Fight 2: Sky Rocket vs. Gyroscopic
Darn, Sky Rocket's first match is against Gyroscopic. After two hits my power switch is hanging out. I tap out, but just before I do, Gyro. hits my wheel and breaks the motor shaft.
Sky Rocket is 0-1 :(
https://www.youtube.com/watch?v=KHiIccGYhsc&spfreload=10

     Fight 3: The Ophidian vs. Low Blow
Not only did Sky Rocket have to face Gyroscopic first, but Joe had to face Low Blow! The fight went better than expected though. I think the video can explain it better than I can.
The Ophidian is 0-1 :(
https://www.youtube.com/watch?v=CgmZlYpaVIY&spfreload=10

     Fight 4: Cornerstone vs. Low Blow
Man, now I have to face Low Blow. The Lexan "wheel guards" did exactly what I wanted them to, only for the first hit. As you can see in the video. After that, the fight went just the way expected.
Cornerstone is 1-1 :(
https://www.youtube.com/watch?v=CgmZlYpaVIY&spfreload=10

    Fight 5: Sky Rocket vs. Jazz
I knew I had this fight unless something went very wrong. I would use this fight to see if my servo horn was stripped, but there is always a catch. The wheels I used to replace the ones on Sky Rocket were a little bit smaller than the other ones. The end result was this.
Sky Rocket is 1-1 :)
https://www.youtube.com/watch?v=FdMZErilPXo&spfreload=10

     Fight 6: The Ophidian vs. Eleos
A two hit fight.
The Ophidian is 1-1 :)
https://www.youtube.com/watch?v=5VFso_4TEQg&spfreload=10

     Fight 7: Cornerstone vs. Slim Pickens
As with Eleos, The first 5 seconds decided the match. I knew he was a very good and low robot. But I decided for a head on assault.
Cornerstone is 2-1 :)

     Fight 8: Sky Rocket  vs. TPd
I had no idea if TPd was still able to spin. But I found out, (as did Dylan) that he is very hard to push around. But at the end I got the judge's nod.
Sky Rocket is 2-1 :)
https://www.youtube.com/watch?v=IAmvrVIIE0c&spfreload=10

     Fight 9: The Ophidian vs. Hercules
The Ophidian's first hit knocked one of Hercules' wheels off. But then, The Ophidian's bar came off. Pushy match from then on. Joe gets the judge's nod.
The Ophidian is 2-1 :)

     Fight 10: Cornerstone vs. Cyclone
Round 2, Ding, Ding, Ding! I charge, and pinned Cyclone against the wall. His first hit disables his weapon, and (unknown to me, and I didn't realize until on the way home) takes the setscrew part of the lite hub off. I thought that something was wrong with the motor. But in the end I lost on a judge's decision.
Cornerstone goes home with a 2-2 record! :D
https://www.youtube.com/watch?v=zYoXt6-M7Tc&spfreload=10

     Fight 11: Sky Rocket vs. The Ophidian
Now, I have to fight my little brother! It didn't turn out good for me.
Sky Rocket goes home with a 2-2 record. 4-6 overall.
The Ophidian is 3-1. :D

     Fight 12: The Ophidian vs. Antelope
After the first 30 seconds, the bar falls off.
The Ophidian goes home with a 3-2 record. :D
 
     The Antweight rumble: Cornerstone, The Ophidian, Poco Tambor, Firearrow, Puppy, and Kate the Rat.
The problem with the set screw being gone only hindered me a little bit (thankfully). But it scares me watching the video, how easily the wheel could have come off. Out of the six, there were three robots remaining. Cornerstone, Puppy and Poco Tambor. I was sure that Poco would win, but the judges let the builders decide, cheering style. Thanks to my Mom, the judges decided for Cornerstone! Yes, Cornerstone won Motorama's Antweight rumble! :D

I want to hand out a special thank you to Zac. He helped me and my Dad with countless things, plus giving advice though out the event. And thanks to NERC for putting on the show.

Right now I'm getting the bots back to normal, after that I'm thinking about a design for another antweight, a mix between Algos, and Nuff Said.

Adam
Revelation Robotics
Title: Re: Revelation Robotics
Post by: RevRobots on March 05, 2015, 05:57:45 pm
Hello All,

I am almost back to normal from post-Motorama depression. I partly over came it by building a new robot.

Introducing: Arrow (no rip off intended Dylan)

https://vimeo.com/121399322

I built this guy using spare parts, and Cubit's chassis which is made of 1/16" stainless steel. Arrow also has a lot of pushing power, and weighs 15.75oz. it also uses 22.2:1 FingerTech Silver Sparks.

Any Comments/Suggestions?

Adam
Revelation Robotics
Title: Re: Revelation Robotics
Post by: zacodonnell on March 05, 2015, 06:02:18 pm
Without a wedge and those big square corners you're going to be taking some big hits from any horizontal spinners you face.  Building robots usually makes me feel better too :)

-Zac
Title: Re: Revelation Robotics
Post by: Infernaltank on March 05, 2015, 06:08:12 pm
THE NEW CRJ WALLBANGER

someone tell charles
Title: Re: Revelation Robotics
Post by: Badnik96 on March 05, 2015, 06:38:36 pm
haha i'm cool with it :)

It's kinda slow for the kind of design it is, and I agree with Zac about the corners. Other than that it looks decent.
Title: Re: Revelation Robotics
Post by: RevRobots on March 07, 2015, 05:24:57 pm
Zac, and Dylan,

Thanks for the suggestions. Right now I only have enough weight for either the wedge, or the rounded edges. I decided to go with the wedge. But there is a lot of time between now and Bot Blast, so I'll probably get around to losing the weight and make rounded corners with some left-over UHMW. Also Dylan, that was not full speed for Arrow. I had to go slow to prevent hitting my mom's kitchen drawers. Any thoughts?

All,

I registered Arrow, Cornerstone, and The Ophidian for Bot Blast this year. Hope to see you guys there! I also may start a thread for an Autonomous NERF blaster, and a couple other projects.

Adam
Revelation Robotics
Title: Re: Revelation Robotics
Post by: zacodonnell on March 07, 2015, 05:44:29 pm
Not planning to enter Revelation? I didn't get to spend much time looking at it at Motorama but I bet the solder joints are still the biggest limiting factor in that bot.  A big (at least 40 watt) soldering iron with a big chisel tip will allow you to make better connections with the larger wires. What you have is fine for doing small work on circuit boards, but when you just need two big wires to be joined together and conduct a lot of electricity (like on your weapon motor) then hotter is often better.  The iron I was using was 80 watts. I use it to make battery packs too, but for your stuff 40w would be fine.

-Zac
Title: Re: Revelation Robotics
Post by: Infernaltank on March 07, 2015, 07:34:45 pm
Hey Adam, is Sky Rocket retired or just not at Bot Blast?
Title: Re: Revelation Robotics
Post by: RevRobots on March 08, 2015, 03:47:44 pm
Hi Zac,

For Bot Blast I am going to make an attempt to have Revelation face someone as a grudge bot. And I think he will stay that way unless I need to fill the brackets or something.

Nate,

No, Sky Rocket is not retired. I just thought that I'd give him a break.

All,

Today I sharpened the wedge on Arrow and it looks pretty good. It is so low that it makes a horrible screeching sound on my wood floor (which my mom just loves).
Also I should mention that the wedge is made out of Lexan.

Suggestions? Questions?

Adam
Revelation Robotics
Title: Re: Revelation Robotics
Post by: MikeNCR on March 08, 2015, 03:51:22 pm
Hi Zac,

For Bot Blast I am going to make an attempt to have Revelation face someone as a grudge bot. And I think he will stay that way unless I need to fill the brackets or something.

Nate,

No, Sky Rocket is not retired. I just thought that I'd give him a break.

All,

Today I sharpened the wedge on Arrow and it looks pretty good. It is so low that it makes a horrible screeching sound on my wood floor (which my mom just loves).
Also I should mention that the wedge is made out of Lexan.

Suggestions? Questions?

Adam
Revelation Robotics

If you've got the time and materials, making spare wedges would be a good idea. The lexan is nice and durable, but against heavier spinners it'll end up looking pretty rough by the end of a long fight so being able to swap in a fresh one for the next match will be handy.
Title: Re: Revelation Robotics
Post by: Infernaltank on March 08, 2015, 04:43:33 pm
hey adam i'm making an article on kits in the near future. can you take a group photo of sky rocket, cornerstone, and the ophidian? i'd love to use it for the article
Title: Re: Revelation Robotics
Post by: RevRobots on March 08, 2015, 08:09:59 pm
Nate,

I'd love to take a pic. of my bots for you. I'll take it as soon as possible. I also just found out that the 22.2:1 gear ratio of silver spark motors are going to be discontinued "because of unresolvable quality issues." Better find a sub. quickly. Just buy them while you can. Also keep in mind that Cornerstone was built from a servo article from FingerTech's website. http://www.fingertechrobotics.com/images/servo201210_build_an_antweight.pdf


Mike,

I will definitely make some more wedges for Arrow.

All,

I thread locked the screws holding Arrow together so vibrations won't un-screw them.

Adam
Revelation Robotics
Title: Re: Revelation Robotics
Post by: Infernaltank on March 08, 2015, 08:14:24 pm
wait really? theyre being discontinued?
Title: Re: Revelation Robotics
Post by: Badnik96 on March 08, 2015, 08:27:40 pm
I'm with Nate here. I was gonna order a bunch of them for FireArrow V2 soon, guess I'll have to do it fast before they get discontinued.
Title: Re: Revelation Robotics
Post by: FingerTech on March 09, 2015, 02:51:12 pm
The Silver 22.2:1's are the only ratio that has one internal gear loosen apart.  I estimate it has happened to 3~5% of them, but that's too high for bots that are meant for competition.  FingerTech has high standards, and that ratio doesn't meet them so it's gone.
Title: Re: Revelation Robotics
Post by: RevRobots on March 09, 2015, 03:40:05 pm
Well as soon as I think I get to sit back for a little bit, another competition is a month away! PennBots Spring Fling Registration is up.

http://www.buildersdb.com/eventdetail.asp?eventID=405

But it's Robot Fighting!

I think I'm going to make the switch for Cornerstone from 22.2:1 to 11.1:1, Keep Arrow the same as long as possible, and move Sky Rocket to 33.3:1. Also this event will be a great test for Arrow.

More Robot Fighting Nate.

Adam
Revelation Robotics
Title: Re: Revelation Robotics
Post by: Badnik96 on March 09, 2015, 03:41:16 pm
I'd love to go to Pennbots but it's the weekend before Rage in the Cage and I'd probably only be able to bring Nocturne.
Title: Re: Revelation Robotics
Post by: RevRobots on March 10, 2015, 03:44:51 pm
Hello All,

Yesterday I put locktite on all of the screws that hold the chassis together, but I didn't put locktite on screws on the top Lexan because locktite ruins Lexan. I found that out on the old NERC forum.

Here is a run down on the bots I hope to bring to Spring Fling:

Cornerstone

Revelation (maybe)

Arrow

The Ophidian

The Sheep That Follows the Good Shepherd (line follower)

and Lazarus (maze solver).

I don't know if I have mentioned this before, but I made some UHMW wheel guards for Cornerstone.

Adam
Revelation Robotics
Title: Re: Revelation Robotics
Post by: RevRobots on March 12, 2015, 03:17:31 pm
Hello All,

Whilst looking through ye olde Servo Mag. from January, I saw this product http://www.operativerc.com/products-miniduo.html. A Dual ESC for drive motors. Is this a good product for combat robots? The article says that it is. Any input?
 

Nate,

I will take a pic. of the bots you wanted as soon as Sky Rocket and The Ophidian look half decent.

Adam
Revelation Robotics
Title: Re: Revelation Robotics
Post by: Lucas Grell on March 12, 2015, 03:35:16 pm
It looks nice, I'd just make sure to wrap it or coat it or something, that's a lot of exposed leads. I prefer mixing on my transmitter, I've got a nice setup on a 9Xr that works well and doesn't add any weight to my bots, but that looks like a decent alternative since it's also the speed controllers.
Title: Re: Revelation Robotics
Post by: seangcxq on March 12, 2015, 10:23:30 pm
Lightweight and small, looks good for an antweight. As Lucas said you'd obviously want to heat shrink it.
Title: Re: Revelation Robotics
Post by: RevRobots on March 18, 2015, 04:49:07 pm
This morning I was writing a build report on Arrow for school (I'm homeschooled), when I realized how flat Arrow's chassis is. I thought back to last summer when I read the whole RioBots tutorial telling about the nut and bolt they used to keep Toro from landing on his side. I can do the same thing with Arrow.  Instead of using a nut and bolt, I would turn the rivets holding the motor mounts in side out to create the same effect. Any input?

Adam
Revelation Robotics
Title: Re: Revelation Robotics
Post by: Lucas Grell on March 18, 2015, 04:52:08 pm
Well, does Arrow get stuck on it's sides/front/back? If it does, you can certainly give it a go. Why do you use rivets, though? Bolts would be better for pretty much anything, you could use a small button head one to help it roll if you need it.
Title: Re: Revelation Robotics
Post by: teamsandman on March 18, 2015, 04:53:18 pm
Doing the idea with rivets or with a nut/bolt sounds like a good idea based on how square all the sides are. The length they have to stick out of the frame though in order to cause it to fall back down is what your testing can help you find out. My advice would be to put them near the middles of the sides, if another robot bent the bolt or rivet, you wouldn't want the end of it to hit the ground (think of a vertical spinner bending it upwards and flipping you over so you don't want to rest on the bolt in that case).
Title: Re: Revelation Robotics
Post by: RevRobots on March 19, 2015, 03:26:28 pm
The reason why I am using rivets instead of bolts, is because using bolts would Arrow over weight. And yes he can get stuck on his side.

All,

I got an order from FingerTech today, which is a couple of speed controllers, 2 33.3:1 motors (for my brother's birthday), hubs, and wheels. I'm going to need them with Dark Pounder registered. :P

Adam
Revelation Robotics
Title: Re: Revelation Robotics
Post by: zacodonnell on March 19, 2015, 10:06:52 pm
I've had success using zipties to prevent losing to "steve judd's law of dynamic stability" in the past.  Just make the end stick out the side of the bot closer to the top than the bottom and you should flip back over. They're plastic so they weigh very little and if they get broken you just put another one on.  Cheap too :)

-Zac
Title: Re: Revelation Robotics
Post by: Infernaltank on March 21, 2015, 04:55:37 pm
Hey what happened in the fight between Sky Rocket and The Ophidian? Did you guys lose a tooth or something, since your bot was gyro dancing from the start?
Title: Re: Revelation Robotics
Post by: Badnik96 on March 21, 2015, 05:23:31 pm
I noticed that they had lost the two "bits" at the very tip of the chipper blade by the end of the competition. It was probably one of those that had come off.
Title: Re: Revelation Robotics
Post by: RevRobots on March 28, 2015, 09:23:31 am
Hello All,

My Mom wants me to make a CAD design for a robot chassis for my Birthday. What CAD program would you guys suggest for a beginner?

Adam
Revelation Robotics
Title: Re: Revelation Robotics
Post by: Lucas Grell on March 28, 2015, 10:53:44 am
Solidworks or Inventor. I prefer solidworks but both are good programs. You can probably get a copy of either free if you dig a bit.
Title: Re: Revelation Robotics
Post by: Don Doerfler on March 28, 2015, 01:11:37 pm
emachineshop its a free downloadable software its like a dumb downed version of solidworks without assembly
Title: Re: Revelation Robotics
Post by: Harry Hills on March 28, 2015, 02:41:39 pm
+1 for Inventor. Its a bit clunky in some ways and some of the interface was designed by a misanthrope but its fantastic and fairly simple. Free copies for students. OFC everything is free on the internet but thats a legit way of doing it.
Title: Re: Revelation Robotics
Post by: teamsandman on March 30, 2015, 08:22:03 am
I like Inventor. Free download for students here: http://www.autodesk.com/education/free-software/inventor-professional . Since you are homeschooled and don't have a email ending in .edu, you might have to contact them, but worth it for software normally going for $7000...
Title: Re: Revelation Robotics
Post by: zacodonnell on April 01, 2015, 08:25:02 pm
Its a bit clunky in some ways and some of the interface was designed by a misanthrope but its fantastic and fairly simple.

I've only used the (full-featured) trial of inventor for a couple of hours to look at somebody else's design, but my experience was that it was very clunky compared to Alibre Design or SolidWorks, both of which I've used in the past.  Is there an easy way to get the weight of an assembly or do you really have to go to the bill of materials and manually add it all up?

Take advantage of free software for educational purposes - you won't regret it later.  Getting into CAD was a big part of what made my bots go from "overweight wrecks that barely functioned" to fairly successful machines that look like engineering was actually involved in creating them.  I still use emachineshop for all my layouts because it is SUPER FAST AND EASY. It is a bit buggy, and it doesn't do assemblies or anything like that, but man, to lay out a baseplate I can do it super, super fast with very intuitive keyboard shortcuts and very easy mirroring / rotation transforms for symmetrical part layouts (which are pretty common for two-sided tank style bots). I do all my 3D stuff with Alibre, but it still starts as 2D in emachine and I export/import for the complex geometries.

-Zac
Title: Re: Revelation Robotics
Post by: teamsandman on April 01, 2015, 09:34:08 pm
TO get the weight in Inventor, use the iProperties feature. Each item needs to have a material assigned to it though.
Title: Re: Revelation Robotics
Post by: Lucas Grell on April 01, 2015, 09:43:03 pm
Same in solidworks, just more easily placed, IMO. I couldn't get used to the way you panned and tilted in Inventor. It was so weird.
Title: Re: Revelation Robotics
Post by: zacodonnell on April 01, 2015, 09:59:40 pm
I got iProperties to work for individual pieces, but on multiselect it didn't appear as an option.

I was looking at somebody else's assembly though, not sure all the parts had materials

-Zac
Title: Re: Revelation Robotics
Post by: TeamAstroBot on April 02, 2015, 08:21:53 am
Being professionally trained to use, Inventor (I am Certified Professional), Solidworks, & ProEngineer, my favorite is a toss up between Inventor & solidworks. They both work very similarly to each other and both have their pros & cons.

Solidworks has a much cheaper cost per license (which really helps out schools), while Inventor is over the top expensive and is priced for the manufacturing/engineering firms, but they make good on that by offering the free student version.

If you're patient, and good with software you will be able to teach yourself the basics of either solidworks or inventor. There are tons of youtube videos out there that will help also, and endless textbooks.
Title: Re: Revelation Robotics
Post by: RevRobots on April 03, 2015, 03:54:44 pm
Hello All,

Almost everything is set for Spring Fling this year. Cornerstone and Arrow are up and driving, but The Ophidian is just driving. All I need is some more Lexan, and to test the weapon to make sure that it is all right. Also thanks to all of you who suggested all of the CAD software.

3 weeks 1 day and counting until Spring Fling.

Adam
Revelation Robotics
Title: Re: Revelation Robotics
Post by: RevRobots on April 07, 2015, 06:09:22 pm
Hello All,

I thought that I would do something over Easter break. I made Titanium versions of the wheel protectors seen here:

(http://forums.delphiforums.com/dir-docs/cjrc/58785635-D9F1-4DE0-8C96-4CB18A78785D/image.jpg)

I will post a pic. later. I think that instead of bars grabbing hold of the Lexan, the bars will just glance off. So, what I'm hoping for to happen is exactly what happened in my fight with Low Blow, except the guard will stay on.

https://www.youtube.com/watch?v=6C9dEncRIbY&spfreload=10

Adam
Revelation Robotics
Title: Re: Revelation Robotics
Post by: RevRobots on April 21, 2015, 05:10:39 pm
Hello All,

Here is a pre-Spring Fling update,

The Ophidian is all back together. I had to replace the front panel, and re-Locktite the setscrews on the blade hub. Also I found out that the chassis was a bent a little bit, my Dad took a hammer to it and straitened it out.


(http://www.buildersdb.com/botpics/9902.jpg)

I made Arrow two side wedges to go along with the middle one, other then that nothing else has happened.

(https://revelationrobotics.files.wordpress.com/2015/04/img_0680.jpg)

I had my Mom re-write Cornerstone on Cornerstone, here is a pic. of the new Titanium wheel protectors:


(https://revelationrobotics.files.wordpress.com/2015/04/img_0682.jpg)


I ran failsafe test on all of the robots and they all worked.

3 1/2 days until Spring Fling... BRING IT ON!

Adam
Revelation Robotics
Title: Re: Revelation Robotics
Post by: RevRobots on April 25, 2015, 07:58:58 pm
Hello All,

I had a great time at Spring Fling. Here is a rundown of the day:

The Ophidian,

Fight 1 vs. Snapping Turtle,

Joe got some nice hits in before he pulled a Nocturne and hit himself into the pit.

Fight 2 vs. P.I.T.A.,

Joe's next fight was against the only other spinner there. After a couple hits though the top of P.I.T.A. came off, and Joe pushed him into the pit.

Fight 3 vs. CrocBot,

CrocBot was a servo lifter that Joe was really afraid of. After a few hits, Joe pulled another Nocturne when he tore the Titanium wedge off of CrocBot.

The Ophidian finished the day with a 1-2 record, 4-4 overall.

Arrow,

Fight 1 vs. P.I.T.A.

P.I.T.A. put a nice gouge in the stainless steel. But his top came off, and I eventually pushed him into the pit.

Fight 2 vs. Snapping Turtle

Snapping Turtle could get under me. He flipped me over and I lost control and drove into the pit.

Fight 3 vs. Cornerstone

Yes Arrow faced Cornerstone which I knew we would at some point. For this match Joe drove Arrow. Cornerstone got under Arrow and disposed of him into the pit. I finally beat my little brother

Arrow Is 1-2.

Cornerstone,

Fight 1 vs. Spare Parts

Spare Parts ended up being the Antweight champion. I got some good drives in and all most pushed him into the pit, but he clamped me and drove me into the pit.

Fight 2 vs. Empire

This fight was no contest. I got under his wedge and drove him into the pit.

Fight 3 vs. Arrow

The winner of this fight would go on to face Crocbot in the losers semi-final. I won.

Fight 4 vs. CrocBot

OK, this is the big one. The winner would be in the top three, and the loser would get absolutely nothing (except for the "one that got away" story). I was scared, but when I could see the space in-between CrocBot's wedge and the floor, I knew I had a good chance unless I made a stupid mistake. Well I didn't and I moved on.

Fight 5 vs. Spare Parts (again)

Yay, I am in the top three out of eight bots! But that is where I ended, Spare Parts clamped me again and drove me into the pit. But, when he let go of me I drove forward which kept me on his ramp, forcing him to drive in. Well I went out fighting.

The Rumble,

Joe drove The Ophidian, I drove Cornerstone, and my Dad drove Arrow. I was out in the first five seconds because when I drove CrocBot into the pit, I went in to. Joe lasted for a little bit longer, enough time to flip over Dave Graham's Robot, and do some damage to Spare Parts before he got pushed into the pit. Arrow lasted the longest, he was one of the 4 robots left (out of eight) but Spare Parts pushed Arrow into the pit. Spare Parts won the rumble to.

Also, Joe's maze solver won it's competition, and my line follower won it's competition.

I had a great time at Spring Fling, this was definitely the least stressful event I have been to. I didn't need to do anything to the Robots except for tightening the setscrews on the blade hub. I didn't even need to charge the batteries! I also got a pair of copal motors for getting 3rd place, I do not know yet what gear ratio they are.

I am definitely looking forward to Bot Blast.

Revelation Robotics is 14-14.

Adam
Revelation Robotics
Title: Re: Revelation Robotics
Post by: Infernaltank on April 25, 2015, 08:54:04 pm
Great to hear you folks had a good time!
Title: Re: Revelation Robotics
Post by: Badnik96 on April 26, 2015, 02:45:12 pm
Good job on second dude! I was hoping you'd do well!

Who made Spare Parts? Also, who won the beetles and who came second in the antweights?


lol at "pulling a Nocturne" :)
Title: Re: Revelation Robotics
Post by: RevRobots on April 27, 2015, 04:30:27 pm
Dylan,

I am not sure who made Spare Parts, I know that he is a PennBots official but that is it. Box Jr. (rejuvenation of U.S.S. Monitor) won the Beetleweights, and Snapping Turtle came in second. Also how did you attach the FingerTech sumo wheels to the silver sparks? Because, I am thinking of using them in an overhead bar spinner I want to design in CAD and mill out for my birthday.

All,

This morning I fixed the wiring so that when I push the joystick forward it goes forward, rather then sideways. I will have to practice driving.
Title: Re: Revelation Robotics
Post by: Badnik96 on April 27, 2015, 04:42:05 pm
There is a setscrew hiding under the rubber that screws it to the shaft. I think it tells you where on the Fingertech site.
Title: Re: Revelation Robotics
Post by: Infernaltank on April 27, 2015, 05:01:43 pm
The sumo wheels have a setscrew in the wheel itself.

http://www.fingertechrobotics.com/proddetail.php?prod=ft-minisumo-wheels-1125
Title: Re: Revelation Robotics
Post by: RevRobots on April 30, 2015, 08:23:46 am
Hi Guys,

My Mom was able to get inventor for free! I am trying to figure out the width, not the diameter of this brushless motor I want to use in the robot I want to design in CAD. I have named him Justice. He is going to be an overhead bar spinner, loosely based on Buster http://www.halrucker.com/buster.html. Here is the link for the Brushless http://www.hobbyking.com/hobbyking/store/__66423__Multistar_V2_2206_2150KV_Motor_The_34_Baby_Beast_34_V2_.html

Pictures of my drawings will be up as soon as I decide what parts I am going to use.

Adam
Revelation Robotics
Title: Re: Revelation Robotics
Post by: Lucas Grell on April 30, 2015, 10:41:13 am
What do you mean by width? Like, the length or height of the motor? Otherwise, the width is the diameter. It says the can and face plate are 17mm long. What weight is this bot going to be? 1, 3?
Title: Re: Revelation Robotics
Post by: RevRobots on April 30, 2015, 11:00:19 am
Lucas,

Justice is going to be a 1lb. Antweight. As for the shaft, I'm trying to figure out the length of the shaft itself. My Dad said that there is no shaft, the nose cone just screws right on it. Would it be safe to put a bar were the propeller would go and screw the nose onto it? I have seen it done before.

Thanks,

Adam
Revelation Robotics
Title: Re: Revelation Robotics
Post by: Badnik96 on April 30, 2015, 11:36:05 am
It's not the ideal setup, but it's doable. Just make sure when you test it you do it safely so you don't get hurt if it accidentally unscrews itself.
Title: Re: Revelation Robotics
Post by: Lucas Grell on April 30, 2015, 12:53:38 pm
Ah I get what you're going for now. Yeah, that motor's shaft is completely internal. I'd definitely think mounting the blade right to the top will work fine. Make sure you locktite it and let it dry before testing it, and use all four of those holes. Countersunk screws are probably a good idea, too. I'd get some nice ones, I wouldn't trust the ones that came with it at all, they're usually pretty junky. Post some models and I'd be glad to take a look at it, sounds like it'll be a fun little bot.

The only thing I don't know is if that motor is powerful enough. I don't know too much about 1 pounders but 30g or so is a pretty light motor. Someone who's built little bots should probably pitch in here, I'm curious myself.
Title: Re: Revelation Robotics
Post by: RevRobots on April 30, 2015, 05:03:17 pm
@ Lucas,

Yes, that was what I was going for, but I was originally going to use the FingerTech Blade Hub. When you say countersunk screws do you mean like these? http://www.fingertechrobotics.com/proddetail.php?prod=screw440FH-25pcs

All,

Here are some drawings of Justice that I've been working on the past couple days using actual dementions of the parts I plan to use:

Here is the full body,

(https://revelationrobotics.files.wordpress.com/2015/04/img_02201.jpg?w=300&h=225)

If you would divide him into three pieces, and look at him from the side this is what you would see,

(https://revelationrobotics.files.wordpress.com/2015/04/img_02191.jpg?w=300&h=225)


And finally here are the bars I plan to make,

(https://revelationrobotics.files.wordpress.com/2015/04/img_02171.jpg)

The hooked one is going to be used against UHMW, and then the other one is your classic kinetic energy transferer.

Adam
Revelation Robotics
Title: Re: Revelation Robotics
Post by: Lucas Grell on April 30, 2015, 05:23:38 pm
Yeah, like that.
Looks nice. I'd round off the KE bar as well, it'll bite better that way.
I wouldn't try and use the blade hub on a motor like that. You'd have to bolt the hub down anyways, so it's probably more effective to just bolt the bar right on to the motor.

Is there any reason you want to have a squared off front on it? Buster has robot bits in it, but it looks like you aren't planning to use the full front area. If you aren't it'd probably be better to round or angle the front section. I'd also make sure you have a bulkhead of some sort between the motor and the electronics, to prevent it grabbing them.
Title: Re: Revelation Robotics
Post by: RevRobots on May 05, 2015, 05:29:45 pm
Hello All,

Last weekend I played around with Inventor, and I drew up Justice.

(https://revelationrobotics.files.wordpress.com/2015/05/screenshot-3.png)

(https://revelationrobotics.files.wordpress.com/2015/05/screenshot-4.png)

I just have to run it by my Dad, and then I can send it off to to a milling company. What company do you guys suggest? I also took a video of Justice's weapon spinning up which I will hopefully upload tomorrow. Right now, if I finish Justice pre-Bot Blast I am going to enter him in instead of Arrow.

Adam
Revelation Robotics
Title: Re: Revelation Robotics
Post by: Lucas Grell on May 05, 2015, 06:30:40 pm
Adam, what are the thin bulkheads inside for? Mounting the motors? Unfortunately, you probably won't be able to get holes in there unless they're drilled through the outside as well. Also, your frame there is uneven. Do you know how to mirror in a sketch? It's very useful, much easier than drawing from both sides, especially if you change the sizing later.
Title: Re: Revelation Robotics
Post by: Badnik96 on May 05, 2015, 10:03:51 pm
I'd recommend just getting the frame milled and making the wheelguards yourself with some thin UHMW.
Title: Re: Revelation Robotics
Post by: teamsandman on May 06, 2015, 02:33:31 pm
Interior corners must be radiused to allow the milling cutter into the frame. The size of radius and therefore size of cutter that will make your part can influence the cost of manufacture significantly.

I can advise you outside of the forum too if you need help with anything from CAD drawing to manufacturing.
Title: Re: Revelation Robotics
Post by: RevRobots on May 06, 2015, 03:53:19 pm
Hi Guys,

On Dylan's suggestion, I drew up Justice (using mirror) without the wheel guards.

(https://revelationrobotics.files.wordpress.com/2015/05/screenshot-5.png)

Interior corners must be radiused to allow the milling cutter into the frame. The size of radius and therefore size of cutter that will make your part can influence the cost of manufacture significantly.

When you mean radiused do you mean rounding of the corners inside instead of a ninety degree angle?

Here is the spin test: https://vimeo.com/127080472

Adam
Revelation Robotics
Title: Re: Revelation Robotics
Post by: Badnik96 on May 06, 2015, 04:21:13 pm
video not found

also that's exactly what he means. When you mill something out it's incredibly difficult to just get a 90-degree angle like how you have it modeled.
Title: Re: Revelation Robotics
Post by: Lucas Grell on May 06, 2015, 04:29:19 pm
It actually just went up, I refreshed it and it worked. Looks kind of wobbly, how is the blade hub attached on that? Yeah, inner 90 degree angles are not machinable from the top. End mills always leave a radius, and very small ones are fragile and not rigid. If you give it at least a 1/8" radius, so it could be milled with a 1/4" endmill, it would be fine. Also, what are the dimensions on the frame?
Title: Re: Revelation Robotics
Post by: seangcxq on May 07, 2015, 10:37:24 am
Quote
When you mean radiused do you mean rounding of the corners inside instead of a ninety degree angle?
The outer ones are ok, just the inside ones are impossible with milling alone. Best thing to do when designing it is think about how it's going to be milled out and it becomes obvious where you need to put a radius or where you don't.
Title: Re: Revelation Robotics
Post by: teamsandman on May 07, 2015, 12:57:54 pm
The attached image shows the 6 corners you need to provide a radius. As Lucas said, the smallest dimension on the radius would be 1/8" so you can use 1/4" endmill (or larger too). In reality, it is better to add slightly larger than the nominal you expect. For example, we said add 1/8" radius, which is .125". It would be better to make it a .13" radius. Same for a .1875" radius, I would make it .19". Just add a little bit extra to the nominal size to make it really easy for the endmill machining.

In Inventor, you can do this in two ways.
1. the easiest is in the general modeling environment, not in a sketch, you can use the Fillet tool to add a .125 radius (.13 is better). Just 1) Click Fillet button, 2) change dimension to .13 and 3) click on all internal corners (Click the vertical edges of the inside corners) (indicated in attached diagram).

2. You can also do it in sketch mode, if you had sketched out the internal profile of the robot. You can use the fillet tool by the same steps but just select the corners to radius in the sketch view.
Title: Re: Revelation Robotics
Post by: Lucas Grell on May 07, 2015, 01:33:49 pm
To be fair, the radius depends if it's going to be done on a manual or CNC mill. A larger radius will probably be just as easy on a CNC as the small one, but quite difficult on a manual mill, if not impossible without a properly sized tool.
Title: Re: Revelation Robotics
Post by: RevRobots on May 07, 2015, 03:38:03 pm
 Hello All,

I
radiused
the interior corners to .13 in. Anything else I need to do?

(https://revelationrobotics.files.wordpress.com/2015/05/screenshot-11.png)

Also what Milling company would you guys suggest?

Again thanks for all of the advice.

Adam
Revelation Robotics
Title: Re: Revelation Robotics
Post by: Lucas Grell on May 07, 2015, 03:40:48 pm
Well, I'd recommend adding holes for mounting the weapon motor as well.
Title: Re: Revelation Robotics
Post by: Harry Hills on May 07, 2015, 04:27:54 pm
And holes for any top armour you'd add.
Title: Re: Revelation Robotics
Post by: teamsandman on May 08, 2015, 09:12:35 am
To be fair, the radius depends if it's going to be done on a manual or CNC mill. A larger radius will probably be just as easy on a CNC as the small one, but quite difficult on a manual mill, if not impossible without a properly sized tool.

Ah very good point. I was thinking CNC when I recommended that, as the CNC does not like doing radii exactly the same as the cutter.
Title: Re: Revelation Robotics
Post by: Lucas Grell on May 08, 2015, 04:01:06 pm
Well, at that point you don't use a curve word. You just have it go right to where it needs to be instead.
Title: Re: Revelation Robotics
Post by: RevRobots on May 14, 2015, 05:40:58 pm
Hi Guys,

Sorry I haven't answered your questions, I was at a homeschooling conference at the same place as Moto. over the weekend.

OK, on to business.

@ Harry and Lucas,

I was not going to have the holes machined. Should I add them? I was going to drill the holes for the top armor with a 4-40 tap, also I was going to use the brushless mount that was in Revelation as a template for the holes in Justice (since I am using the same Brushless).

All,

I added a slight fillets on the two back edges of Justice, and made the fillets bigger on the front edges. For those who want to know, originally the front fillets were 4mm but I changed them to 7mm, and the two back ones are 2mm.

(https://revelationrobotics.files.wordpress.com/2015/05/screenshot-111.png)
Title: Re: Revelation Robotics
Post by: Harry Hills on May 14, 2015, 06:07:34 pm
I'd get any mounting holes, threaded or no etc machined in. Another couple of machine setups = few more $ but you get a totally functional part ready to go out at the end of it.

You can be 100% confident that your hole positions are going to be bang on to your drawing.
Title: Re: Revelation Robotics
Post by: Lucas Grell on May 14, 2015, 11:46:42 pm
Yeah, what Harry said. Accurate holes are important, especially in thin material. It'll also save you time, which is always good. I still think an angle on the front is better, it'd save weight that would be spent on empty space, according to your plan.
Title: Re: Revelation Robotics
Post by: RevRobots on May 19, 2015, 05:38:25 pm
@Lucas and Harry,

Do you know what thread size these screws are? http://www.fingertechrobotics.com/proddetail.php?prod=screw440BH-25pcs I need it because when you thread the holes in Inventor, it asks what thread size.

All,

My Dad had an idea, he as access to a 3D printer at the school he works at, so why not test the design with a 3D printer?

Adam

Revelation Robotics
Title: Re: Revelation Robotics
Post by: Lucas Grell on May 19, 2015, 06:40:52 pm
They're #4-40, it will be listed in inch threads. Sure, test it that way. It's a nice way to prototype, and this is a pretty small bot so it isn't a ton to print.
Title: Re: Revelation Robotics
Post by: RevRobots on June 02, 2015, 04:30:16 pm
Hi Guys,

I got the chassis 3D printed, I hot glued the brushless, BESC, some spare ESCs that I had, battery, and some 33.3:1 motors in to se if there is enough room, and I'm pretty sure there is. I still have to get the RX and Tx. I don't think it looks half bad.

(https://revelationrobotics.files.wordpress.com/2015/06/img_0691.jpg)

The model wedge is siding Al. the real thing is going to be Ti. Yes it does look like a mini Hazard.

Any comments/suggestions?

Adam
Revelation Robotics
Title: Re: Revelation Robotics
Post by: Lucas Grell on June 02, 2015, 04:48:55 pm
Cool, how thick is the wedge going to be?
Title: Re: Revelation Robotics
Post by: Harry Hills on June 02, 2015, 05:25:32 pm
Are you keeping the printed frame? Just curious not a criticism.

Overall shape is nice. Its not actually that hazard like in looks, you can tell it's your own design etc.

Those drive motor shafts are putting me on edge a bit looks like bend city waiting to happen, either add bearing supports on the other side or cut them down. Less gap between wheel and frame also. Hot glue is ok for pretendo bots but i'd get proper hubs for combat. Maybes some better wheels too, like fingertech foam ones. They're the bomb. I'd mention wheel guards but then i'd be a hypocrite.

Your weapon bar, while high looks like it could be pretty nasty. What material is it, it looks a bit aluminum? I'd change that for a legit grade of steel or better yet wearplate or tool steel.

I like the wedge shape. Nicely shaped ti and it will rock.
Title: Re: Revelation Robotics
Post by: zacodonnell on June 02, 2015, 08:31:01 pm
I really like it. That wedge looks like a great shape. It would probably hold up for a little while in a decent grade of aluminum like 2024 or even 6061 and you could make it (and spares) at home that way. If you do it out of ti it will be tougher to make yourself but would hold up a lot better. Ebay has some cheap ti cutoffs in that size range I'd bet.

Definitely should swap the weapon bar out for steel. Even a piece of 4130 from onlinemetals would be a huge improvement in strength and all you would have to drill would be the center hole. You could get spares in case you didn't get it quite right the first time - it's pretty cheap. Even un-heat treated it would be so-so but it would rock if it was heat treated. If you do end up going forward with the bot maybe fight the first time with the annealed or flame-hardened version and then switch to the heat treated one if you like it.

-Zac
Title: Re: Revelation Robotics
Post by: Badnik96 on June 02, 2015, 11:15:43 pm
That looks like Slice's bar from last year. If it is, it's aluminum. You should definitely swap it out for steel.

Shape looks excellent. Should do well at Bot Blast.
Title: Re: Revelation Robotics
Post by: RevRobots on June 03, 2015, 09:09:28 pm
@Lucas,

The wedge is .03 in. Titanium.

@Zac, Harry, and Dylan,

What grade and how thick would you suggest for the steel weapon? I am using the Fingertech blade hub so it can't be very thick. Also Harry, I am still going to go with the milled chassis.

All,

I made the wedge today. I can't get a pic. now, but I will post one tomorrow.

Adam
Revelation Robotics
Title: Re: Revelation Robotics
Post by: Jeff Gier on June 04, 2015, 09:51:23 am
Something like this http://www.lowes.com/pd_53219-442-490-105-M018_1z0wgas__?productId=50265887&pl=1 (http://www.lowes.com/pd_53219-442-490-105-M018_1z0wgas__?productId=50265887&pl=1) may be plug and play.  I'm not sure what it weighs, but it does have the right hub size.  You can cut them down to size with a hack saw and grind or file it into shape.  Edger blades come in many sizes, just go to your local hardware store and check it out.  The blade fingertech sells would probably work here too!

If you still want to build your own blade, steel is a good choice.  4130, 4140 are good grades that can be machined at home with a hacksaw (with a special blade).  I wasn't able to drill through any 4140 with standard HSS drill bits, but cobalt (not Kobalt) bits are usually available at a hardware store and they work.  I wouldn't use a blade thinner than 1/16" steel. 
Title: Re: Revelation Robotics
Post by: RevRobots on June 04, 2015, 07:54:53 pm
@Jeff

Thanks! I will check it out.

All,

As promised here is a pic. of the wedge.

(https://revelationrobotics.files.wordpress.com/2015/06/img_0694.jpg)

Let me know what you think.

Adam
Revelation Robotics
Title: Re: Revelation Robotics
Post by: teamsandman on June 09, 2015, 11:57:58 am
Looks nice, now that you have a hot glued mockup, make sure it can drive around nicely both regular and when upside down.
Title: Re: Revelation Robotics
Post by: RevRobots on June 13, 2015, 09:29:10 pm
OK guys, update.

I sent my design to Whyachi last night. Also I got the bar that Jeff was talking about, I drew it up in CAD to see how much I would have to cut off for Justice to make weight. I am also putting together a FingerTech order for the remaining parts I need for Justice. Like the Tx and Rx, ESCs, 11.1:1 motors and Titanium for the top. It looks like Justice is the first bot of mine to not be done a month before the event.

Its not much to report but that's all I got.

Adam
Revelation Robotics
Title: Re: Revelation Robotics
Post by: RevRobots on June 15, 2015, 02:40:58 pm
Hi Guys,

I put and order in at FingerTech for the stuff I needed, It should be here in a week or two. Also I got in touch with Whyachi and they said that they would start the milling very soon.

Adam
Revelation Robotics
Title: Re: Revelation Robotics
Post by: FingerTech on June 15, 2015, 04:45:16 pm
I think you chose DHL.  You'll have it in 2 days, not 2 weeks.  :)
Title: Re: Revelation Robotics
Post by: RevRobots on June 15, 2015, 05:19:33 pm
Oh, Yay!
Title: Re: Revelation Robotics
Post by: RevRobots on June 19, 2015, 05:04:56 pm
A couple things to report,

I got my FingerTech order a couple days ago and everything weighs a little more than 3oz. Which is good because the chassis is going to be 10.48 oz. And specking of the chassis, Whyachi said that the chassis is done! And they said that they would ship it today. It looks like I'll have Justice done sooner then I thought.

Adam
Revelation Robotics
Title: Re: Revelation Robotics
Post by: Harry Hills on June 19, 2015, 05:17:52 pm
Eagerly awaiting pictures when stuff arrives.
Title: Re: Revelation Robotics
Post by: RevRobots on July 02, 2015, 12:21:22 pm
Hi guys,

So I get home from vacation the other day, and look at what was waiting for me:

(https://revelationrobotics.files.wordpress.com/2015/07/img_0699.jpg)

I also soldered together the ESCs motors JST connector and switch. I also used a bigger soldering Iron (on Zac's suggestion) to solder on the switch, and it worked well.

Adam
Revelation Robotics
Title: Re: Revelation Robotics
Post by: Jeff Gier on July 02, 2015, 12:40:13 pm
That is a REALLY beefy looking frame.  Should be a tank with a Ti wedge too!
Title: Re: Revelation Robotics
Post by: Badnik96 on July 02, 2015, 03:40:08 pm
Now that is a thick frame. Thicker than FireArrow's chassis was even. Should hold up well.
Title: Re: Revelation Robotics
Post by: zacodonnell on July 04, 2015, 08:38:09 pm
Are you sure you're going to make weight with that frame? If you do, it probably won't be the weak link.  Make sure use are careful when you drill mounting holes in it because you won't get a do-over on something like that. I always like the look that a mill makes on aluminum. Like a maze.

-Zac
Title: Re: Revelation Robotics
Post by: RevRobots on July 05, 2015, 08:57:49 am
Hi guys,

Yes I am going to have to lose some weight, but I think it looks pretty darn good with top armor and a wedge:


(https://revelationrobotics.files.wordpress.com/2015/07/img_0331.jpg)

Adam
Revelation Robotics
Title: Re: Revelation Robotics
Post by: zacodonnell on July 05, 2015, 09:07:25 am
Are the motors actually bolted in too?  It looks great.  Although countersinking ti is tricky you may want to consider countersinking the bolts on top so the blade doesn't chop them off.

When you start to do weight reduction figure out how much you need and figure out in advance how much material you would have to remove from a specific part before drilling/cutting it.  On my first bot I was WAY overweight so I drilled a bunch of holes in the shell.. for two days... only to realize that it STILL didn't make weight and I had to change the batteries. In the end I didn't actually need to drill the holes out and I lost a fight because an opponent grabbed me by the holes and dragged me around.

It doesn't take too long to calculate how much weight you can save with a hole, and you should already know how much weight is in each part (or be able to weigh it). If you would have to dump 50% of a part then it probably isn't the right thing to do unless it is a very expendable part.

-Zac
Title: Re: Revelation Robotics
Post by: RevRobots on July 05, 2015, 09:23:07 am
Hi Zac,

Yes the motors are bolted the motors directly to the frame, I made the bulkheads the same width as FingerTech's bearing blocks, http://www.fingertechrobotics.com/proddetail.php?prod=ft-bearing-block

Also here is a pic. of Justice pre-crash diet:

(https://revelationrobotics.files.wordpress.com/2015/07/img_0332.jpg)

Adam
Revelation Robotics
Title: Re: Revelation Robotics
Post by: zacodonnell on July 05, 2015, 11:37:45 am
it looks totally awesome. Great job and I can't wait to see it in person.

-Zac
Title: Re: Revelation Robotics
Post by: Badnik96 on July 05, 2015, 02:25:40 pm
Looks excellent. Just be careful you only test the spinner with a top on it because otherwise it'll probably end up sucking wires into the path of the blade and self-destructing. Mike and Haz can tell you all about that.
Title: Re: Revelation Robotics
Post by: RevRobots on July 05, 2015, 04:43:55 pm
Hi Guys,

Here is a list of the parts I'm using, do you guys know of any parts that would be worthwhile swap to save weight?

2 Tiny ESCs

Rhino 2S 460mAh 20C 7.4v Lipo

Hobby King Rx

11.1:1 silver sparks

Turnigy 12A plush BESC

Any help with this would be appreciated!

Adam
Revelation Robotics
Title: Re: Revelation Robotics
Post by: Lucas Grell on July 05, 2015, 05:34:06 pm
How much weight do you need to lose? Would liteflite/lectralite wheels be lighter?
Also, you could take a bit of material off the ends of the blade at an angle, so that the two tips are the furthest out. It'll bite better.
Title: Re: Revelation Robotics
Post by: Koolaid64 on July 05, 2015, 06:32:52 pm
drill some holes in that frame.
-Kyle
Title: Re: Revelation Robotics
Post by: mathias on July 05, 2015, 06:52:57 pm
drill some holes in that frame.
-Kyle

The "battery box" sides forward of the drive motors looks particularly beefy, and you might be able to lose some weight there. But worth heeding the story of:

When you start to do weight reduction figure out how much you need and figure out in advance how much material you would have to remove from a specific part before drilling/cutting it.  On my first bot I was WAY overweight so I drilled a bunch of holes in the shell.. for two days... only to realize that it STILL didn't make weight and I had to change the batteries. In the end I didn't actually need to drill the holes out and I lost a fight because an opponent grabbed me by the holes and dragged me around.

It doesn't take too long to calculate how much weight you can save with a hole, and you should already know how much weight is in each part (or be able to weigh it). If you would have to dump 50% of a part then it probably isn't the right thing to do unless it is a very expendable part.

-Zac
Title: Re: Revelation Robotics
Post by: RevRobots on July 20, 2015, 03:59:53 pm
Hi Guys,

Bot Blast was a BLAST! I got Justice done 2 days before the event, sadly I was not able to use the milled chassis. But I did build another chassis that worked just as well.

Joe's bot Ophidian went 0-2, losing to FireArrow, and Dark Pounder.

Cornerstone went 3-2, winning against Petit Gateau, Mini-Boss, and Dark Blade. And losing to Slim Pickens, and Cyclone.

Justice went 2-2, winning against Mini-Boss, and Spinzilla. And losing to Gyroscopic, and Cyclone.

All bots preformed very well, Justice even got to chop a wheel off of Spinzilla, and don't even get me started on beating Dark Blade.

More info and post BB damage in the next post.

Adam
Revelation Robotics
Title: Re: Revelation Robotics
Post by: Infernaltank on July 20, 2015, 04:41:00 pm
Your match with Spinzilla was brutal. You were going full on Hazard mode!
Title: Re: Revelation Robotics
Post by: RevRobots on July 29, 2015, 03:26:17 pm
Hi Guys,

I made a new base plate for Cornerstone since it cracked at Bot Blast. Justice also needs a new top plate. Thought you guys might want to know that I'm working on a R/C car that uses an Arduino for the Tx and Rx. And uses a Wii Nunchuk as the joystick. I'm hoping to use these principles in another robot sometime.

Adam
Revelation Robotics
Title: Re: Revelation Robotics
Post by: Jeff Gier on July 29, 2015, 03:36:39 pm
I just saw the Justice vs Spinzilla video recently.  It kicked some bot!  How much did the blade end up weighing?
Title: Re: Revelation Robotics
Post by: RevRobots on July 29, 2015, 04:12:32 pm
Thanks! The bar ended up being 3.70 oz.

Adam
Revelation Robotics
Title: Re: Revelation Robotics
Post by: RevRobots on August 05, 2015, 03:14:09 pm
Hi All,

New Bot Alert: Bulwark!

(http://buildersdb.com/botpics/10109.jpg)

Well that is the bottom of Bulwark. The top is all out operation Swiss cheese:

(https://revelationrobotics.files.wordpress.com/2015/08/img_8909.jpg)

Also I couldn't help doing this, what movie did I get this v from?

(https://revelationrobotics.files.wordpress.com/2015/08/img_0377.jpg)

And yes it uses the original milled chassis that I got for Justice.

Questions/Comments?

Adam
Revelation Robotics
Title: Re: Revelation Robotics
Post by: Lucas Grell on August 05, 2015, 03:27:21 pm
Why aren't you going to run Justice any more?
Title: Re: Revelation Robotics
Post by: RevRobots on August 05, 2015, 03:31:21 pm
Oh no, I built a different chassis for Justice 3 days before the event. It worked out pretty well.

Adam
Revelation Robotics
Title: Re: Revelation Robotics
Post by: Badnik96 on August 05, 2015, 04:03:47 pm
Back thing is from Toy Story 2 :P

Looks great, as a pure brick it should hold up well. I'd consider running smaller wheels though. Right now you are going to lose to literally anything with a wedge.
Title: Re: Revelation Robotics
Post by: Lucas Grell on August 05, 2015, 07:09:54 pm
Ah, I missed that part in the earlier post. Do you have pictures of the frame that was on Justice?
Title: Re: Revelation Robotics
Post by: RevRobots on August 11, 2015, 04:12:49 pm
Hi All,

As you have probably heard or seen, Joe's robot Ophidian keeps having trouble keeping his bar on. He is using FingerTech blade hub. Do you guys have any suggestions on what to do?

Thanks in advance,

Adam
Revelation Robotics
Title: Re: Revelation Robotics
Post by: Coboxite on August 11, 2015, 04:43:39 pm
Hi All,

As you have probably heard or seen, Joe's robot Ophidian keeps having trouble keeping his bar on. He is using FingerTech blade hub. Do you guys have any suggestions on what to do?

Thanks in advance,

Adam
Revelation Robotics
What part is failing: the lock nut, the set screw, or the shaft of the motor?
Title: Re: Revelation Robotics
Post by: Jeff Gier on August 11, 2015, 04:49:15 pm
I've seen this on just about every Viper kit.  It's pretty awesome as long as there is lexan between you and the blade. 

First thing is to use Loctite and torque the bolts in hard.  I like red loctite, but that's often an unpopular opinion.  If this doesn't work, file a flat onto the shaft and put the set screw into it.  After that, you could try to re-drill and tap the hub for a larger set screw. 

Be safe in your testing!
Title: Re: Revelation Robotics
Post by: FingerTech on August 11, 2015, 05:00:59 pm
I replied to Joe's email, but since others might be having the same trouble, here is what I replied!

The biggest factor is getting the Blade Hub to stay on the shaft is to make sure the setscrew tightens onto a flat spot.  The motors don't have one normally, but I have ground one into the shaft for you with the Spinner Add-On.  Maybe take a look at it and make sure it is a shape that the set screw can grip well.  You want it to be flat or even cup-shaped so that the setscrew would have to loosen out for it to be able to come off.  If it isn't, you can use a dremel with a cut-off disc to make it better.  (A metal file also works.)

Medium strength Loctite (blue) is usually enough to hold a setscrew in place, but it needs at least one day to properly cure.  If you put it on just before a fight, it won't do anything.  :)

Lastly, if the setscrew still won't stay in place you could try using a longer one, or if you can't find a longer one you can use two setscrews with one stacked on top of the other.  This gives more surface area for the Loctite to hold onto.

Hope that helps!
Title: Re: Revelation Robotics
Post by: Lucas Grell on August 11, 2015, 05:04:03 pm
Two set screws stacked is usually better than a single longer one- they tend to kind of bite, and the one on the shaft can't really back out at all.
Title: Re: Revelation Robotics
Post by: mg4201 on August 13, 2015, 10:09:32 pm
make sure you are de greasing both parts of the fastener before applying loctite.  You can stake the screw with a sharp center punch. after that, is the motor shaft big enough to cut a key way in?. keyed motor shafts are very common in large electrical motor applications.
Title: Re: Revelation Robotics
Post by: RevRobots on August 31, 2015, 01:41:53 pm
Hi Guys,

Thanks for all of the help with the viper kit.

Updates:

I upgraded Cornerstone with a 3S Lipo, and some horns. Cornerstone is VERY fast now.

Arrow is now in the hands of my brother. I turned him from a derpy pusher into a thwack bot.

I got some new, smaller wheels for Bulwark.

Since The Ophidian is not going to Barn Battles, I convinced Joe to let me try his chipper blade on Justice. But every time since then, the brushless hasn't worked.  then I took the bar off and it worked great. Do you guys know whats going on?

Pics of Cornerstone, and Arrow will be up shortly.

Adam
Revelation Robotics
Title: Re: Revelation Robotics
Post by: Lucas Grell on August 31, 2015, 01:45:41 pm
Sounds like a loose connection. It should do SOMETHING, even if not well.
Title: Re: Revelation Robotics
Post by: RevRobots on August 31, 2015, 02:37:55 pm
I'm sorry Lucas I forgot to add that the bar is spinning at about the same speed as a servo motor.

Adam
Revelation Robotics
Title: Re: Revelation Robotics
Post by: Lucas Grell on August 31, 2015, 05:45:56 pm
Do you have another speed controller to try?
Title: Re: Revelation Robotics
Post by: zacodonnell on August 31, 2015, 06:38:42 pm
It may be a loose connection like Lucas said but usually I find it is a bad solder joint. Did you happen to clip the motor leads off and try to re-solder connectors in this bot? It might only manifest with the new bar on if the new bar causes more current draw than the old one did.  Is the new bar significantly heavier, longer, or with more weight at the ends?

You've tested that the motor works fine with no bar attached, and doesn't do anything with the new bar. Does it still spin the old bar ok?  Might be something else changed between the last use and now that you don't remember... worth a check.

-Zac
Title: Re: Revelation Robotics
Post by: Lucas Grell on August 31, 2015, 08:42:51 pm
To clarify I consider that a loose connection. Bad connection might have been a better way to put it :)
Title: Re: Revelation Robotics
Post by: RevRobots on September 03, 2015, 12:09:04 pm
https://vimeo.com/138214077 (https://vimeo.com/138214077)

I got Justice working! My Dad suggested that I try a 3s battery, and it worked. It is very terrifying.

Adam
Revelation Robotics
Title: Re: Revelation Robotics
Post by: Badnik96 on September 03, 2015, 12:34:04 pm
Says your video isn't found.

Have you fixed the weapon throwing problem yet? If it didn't have that Justice would be a real threat.

Good luck this weekend.
Title: Re: Revelation Robotics
Post by: MDBuswell on September 03, 2015, 01:05:35 pm
Video seemed to work fine for me. Looks good, though you can almost make it a walker with how much it was moving with that blade spinning!
Title: Re: Revelation Robotics
Post by: RevRobots on September 03, 2015, 01:43:24 pm
@Dylan,

Vimeo takes about 30 min. to upload a video. You probably looked at it when it was still loading. By weapon throwing, do you mean the bar coming off? If so I changed it so that it spins the other way now.

@Mirechath

Yeah, when it moved the most was when I turned the radio off to test the failsafe.

Thanks guys!

Adam
Revelation Robotics
Title: Re: Revelation Robotics
Post by: RevRobots on September 07, 2015, 09:48:14 am
Hi Guys,

Barn Battles was a Blast, a huge thanks to Kyle for putting it on.

Here's the lowdown

Bulwark went 2-3, Winning against: Spinzilla, and Brisinger. And losing to: Cornerstone, Justice, and Arrow. The Chassis held up beautifully against Brisingr. He ended up tying for 3rd.

Arrow went 2-3, Winning against: Spinzilla, and Bulwark. And losing to: Cornerstone, Justice, and Brisingr. Arrow did very nicely as a thwack bot, keeping the other robots at bay. He ended up tying for 3rd.

Justice went 4-1, Winning against: Brisinger, Bulwark, Spinzilla, and Arrow. And Losing to Cornerstone. This was not Justice's best performance. The spinner was elusive the whole event, And the threads that held the Brushless on, finally just gave out. Eventually my Dad and I are going to build a new version that has the weapon driven by a belt and pulleys. It still got second though!

Cornerstone went 5-0, Winning against: Justice, Brisinger, Bulwark, Spinzilla, and Arrow. Cornerstone gets First Place! I wasn't without some damage. At some point I'll take the Titanium wedge off and hammer out until it is (semi) flat.

Again thanks to Kyle again for the awesome event.

Adam
Revelation Robotics
Title: Re: Revelation Robotics
Post by: Green machines on September 07, 2015, 10:14:17 am
Congratulations! Hope to see you at Franklin.
Title: Re: Revelation Robotics
Post by: RevRobots on September 08, 2015, 01:08:30 pm
Hello Fellow Evil Geniuses,

My dad has sent me on a quest to make my robots better. So what do you guys use to mount silver sparks? As of right now, I use the FingerTech bering blocks with the 2-56 Button Head Screws. What would you guys suggest to replace/make this better?

Adam
Revelation Robotics
Title: Re: Revelation Robotics
Post by: Kaldonis on September 08, 2015, 03:35:08 pm
My dad has sent me on a quest to make my robots better. So what do you guys use to mount silver sparks? As of right now, I use the FingerTech bering blocks with the 2-56 Button Head Screws. What would you guys suggest to replace/make this better?

Are there any particular issues you're having with the FT bearing blocks? I've always found them to be pretty solid.
Title: Re: Revelation Robotics
Post by: RevRobots on September 08, 2015, 04:30:18 pm
Are there any particular issues you're having with the FT bearing blocks? I've always found them to be pretty solid.

The screws loosen after a fight or two, we're trying to find out a way to prevent that.

Adam
Revelation Robotics
Title: Re: Revelation Robotics
Post by: Lucas Grell on September 08, 2015, 08:06:27 pm
Are you using loctite?
Title: Re: Revelation Robotics
Post by: RevRobots on September 08, 2015, 08:24:11 pm
Yes I am.

Adam
Revelation Robotics
Title: Re: Revelation Robotics
Post by: Lucas Grell on September 08, 2015, 08:26:01 pm
Are you giving it time to cure before you use the bot? It takes a day or so to reach full strength.
Title: Re: Revelation Robotics
Post by: RevRobots on September 09, 2015, 08:44:07 pm
Yes I did While at Barn Battles I replaced one of the motors, and the mounting screws had some strange black crusty stuff on them.

Adam
Revelation Robotics
Title: Re: Revelation Robotics
Post by: Lucas Grell on September 09, 2015, 09:18:07 pm
So did you have the issues only after the replacement or before as well?
Title: Re: Revelation Robotics
Post by: RevRobots on September 10, 2015, 07:16:47 am
Yes there still was that problem. They were so lose in fact, that you could wiggle the motor about as much as you could up and down with the motor completely unscrewed at all.

Adam
Revelation Robotics
Title: Re: Revelation Robotics
Post by: TDS on September 10, 2015, 01:47:59 pm
are the FT bearing blocks anodized after being tapped? can you see the anoidzation in the holes?  It might prevent loctite from adhering properly
Title: Re: Revelation Robotics
Post by: RevRobots on September 10, 2015, 02:45:08 pm
Do you mean if the blocks are tapped? Because they aren't, just the motors mounting holes themselves are tapped. Either way I'm  pretty sure they are, you would have to ask Kurtis about that.

Adam
Revelation Robotics
Title: Re: Revelation Robotics
Post by: RevRobots on September 11, 2015, 02:02:53 pm
Hi Guys,

This question is pointed to the guys who make spinners. How would you guys build the weapon assembly for an Ant? And what Pulley/belt combo would you guys use? I'm asking this because I'm looking to make Justice's weapon belt driven.

Thanks for all you help.

Adam
Revelation Robotics
Title: Re: Revelation Robotics
Post by: Jeff Gier on September 11, 2015, 04:24:42 pm
I've always used round belts because I like that they can slip on impact.  1/8" round urethane from belting from mcmaster. 

Pulleys are usually custom.  I've taken an aluminum servo city hub and put a groove in it with a file before.  Works really well.
Title: Re: Revelation Robotics
Post by: Koolaid64 on September 11, 2015, 07:41:35 pm
 can make you something if you need.
-Kyle
Title: Re: Revelation Robotics
Post by: RevRobots on September 14, 2015, 03:39:07 pm
@Jeff

When you say "servo city hub" do you mean these: https://www.servocity.com/html/timing_pinion_pulleys.html (https://www.servocity.com/html/timing_pinion_pulleys.html), or these: https://www.servocity.com/html/smooth_hub_pulleys.html#.VfcgLOmLMcA (https://www.servocity.com/html/smooth_hub_pulleys.html#.VfcgLOmLMcA), and could I use the belts that they sell to go with them? Or can they stand up to the stress?

@Kyle

Thanks Kyle! I will have to see about that.

All,

I was thinking about how to mount the axle inside of Justice. I think that the type of axle to best suit my needs would be a live axle. How would you guys do this? Maybe these?https://www.servocity.com/html/1_4__ball_bearing_quad_pillow_.html#.VfchzOmLMcA (https://www.servocity.com/html/1_4__ball_bearing_quad_pillow_.html#.VfchzOmLMcA)

Adam
Revelation Robotics
Title: Re: Revelation Robotics
Post by: Lucas Grell on September 14, 2015, 09:26:11 pm
The pulleys servocity sells are XL pitch, they're rather large for a small robot like yours.
Those blocks would probably work well. You can likely use some Fingertech belts and pulleys to power the axle.
Title: Re: Revelation Robotics
Post by: Jeff Gier on September 15, 2015, 12:24:25 am
@Jeff

When you say "servo city hub" do you mean these: https://www.servocity.com/html/timing_pinion_pulleys.html (https://www.servocity.com/html/timing_pinion_pulleys.html), or these: https://www.servocity.com/html/smooth_hub_pulleys.html#.VfcgLOmLMcA (https://www.servocity.com/html/smooth_hub_pulleys.html#.VfcgLOmLMcA), and could I use the belts that they sell to go with them? Or can they stand up to the stress?


I don't see anything on servocity like what I had.  I may have gotten it from lynxmotion.  THey looked like these: http://www.lynxmotion.com/p-115-universal-hub-4mm-pair.aspx (http://www.lynxmotion.com/p-115-universal-hub-4mm-pair.aspx)

I clamped them on the motor and then spun it and put a groove in it with a round file.  Worked well.

I like dead shafts way more than live shafts.  They add rigidity in most cases and I think it is a lot easier to attach a pulley to a blade than to attach a blade to a shaft.
Title: Re: Revelation Robotics
Post by: RevRobots on September 17, 2015, 04:07:33 pm
@ Jeff and Lucas,

Thanks for the insight, I should be upgrading Justice very soon.

All,

Here is some C.A.D. of an upcoming Beetleweight: Son of Thunder

SOT is pictured here with a Anti-drum attachment:

(https://revelationrobotics.files.wordpress.com/2015/09/img_0449.jpg)

And here with a full wedge:

(https://revelationrobotics.files.wordpress.com/2015/09/img_0450.jpg)

The curved parts will be UHMW, the center motor mounts/center supports are 60-61 Al. and the front and back will be HDPE.

Tell me what you think.

Adam
Revelation Robotics
Title: Re: Revelation Robotics
Post by: Infernaltank on September 18, 2015, 10:54:40 am
4wd 1000rpm motors?
Title: Re: Revelation Robotics
Post by: RevRobots on September 19, 2015, 07:08:14 am
Yes. I won some 1000rpms at Barn Battles this year, so I though I'd save some money and use the motors.

Adam
Revelation Robotics
Title: Re: Revelation Robotics
Post by: RevRobots on September 22, 2015, 02:46:20 pm
Hi Guys,

For an overhead bar spinner like Justice, does it matter if the pulleys and belt are on top being exposed or would you guys suggest it being under the top plate. Also would using wood screws to mount HDPE together crack it?

Adam
Revelation Robotics
Title: Re: Revelation Robotics
Post by: Lucas Grell on September 22, 2015, 03:04:39 pm
You'll be fine with them above so long as there's not too little space between the belt and the bar.
Title: Re: Revelation Robotics
Post by: RevRobots on September 24, 2015, 03:01:40 pm
Hi Guys,

So I ask my dad to get some lexan from Lowe's...


(https://revelationrobotics.files.wordpress.com/2015/09/img_0746.jpg)

For comparison, that is a 3' piece of pvc pipe. Thought you guys would get a kick out of this.

Adam
Revelation Robotics
Title: Re: Revelation Robotics
Post by: zacodonnell on September 24, 2015, 09:12:38 pm
I have totally done that before... usually when I need a piece away which seems to happen to me too often...

-Zac
Title: Re: Revelation Robotics
Post by: RevRobots on September 30, 2015, 04:01:59 pm
Hi Guys,

What is lead free tip tinner? My Dad is teaching an electronics class at the H.S. he teaches at, and thought I could use it. But I have no idea what it is.

Adam
Revelation Robotics
Title: Re: Revelation Robotics
Post by: TeamAstroBot on October 01, 2015, 12:21:59 pm
https://www.youtube.com/watch?v=2kJ9ipTvXCg

This MAY help? (No idea, I didn't watch the video, just being honest!)
Title: Re: Revelation Robotics
Post by: RevRobots on October 10, 2015, 09:45:13 am
Hi guys,

I have to run it over with my Dad, but I think for Justice v2 I'm going to use a viper kit chassis. So for my question, for 11.1:1 motors what is the max. diameter wheels I could use without destroying the motors and ESCs?

Thanks again,

Adam
Revelation Robotics
Title: Re: Revelation Robotics
Post by: MikeNCR on October 10, 2015, 12:38:11 pm
Hi guys,

I have to run it over with my Dad, but I think for Justice v2 I'm going to use a viper kit chassis. So for my question, for 11.1:1 motors what is the max. diameter wheels I could use without destroying the motors and ESCs?

Thanks again,

Adam
Revelation Robotics

I run the 11:1's on 3s with ~1.4" wheels (turned down lite flites) on Algos and I wouldn't really go much larger than that.
Title: Re: Revelation Robotics
Post by: RevRobots on October 12, 2015, 03:51:36 pm
Thanks Mike.

All,

How would one use a flanged bearing in a horizontal spinner, are they even meant for high speeds? Should I use one or two? Do I just push the axle in, or should I use collars? I am very new at using axles and bearings, so forgive me if I screw something up.

Adam
Revelation Robotics
Title: Re: Revelation Robotics
Post by: RevRobots on October 13, 2015, 03:48:42 pm
As an addition to the last post ^. Could I use bearing blocks from Fingertech? And how do you use needle roller bearings? I plan to use those as a backup plan.

Adam
Revelation Robotics
Title: Re: Revelation Robotics
Post by: RevRobots on October 23, 2015, 03:18:36 pm
Hi guys,

I will be at Franklin Institute tomorrow, but I won't be competing. I have a football game at 10am. But I will be there to see you guys, since if I don't go I'll have to wait until Moto to see you guys. Also, I'm going to use a viper kit for Justice's v2 chassis. Any questions or concerns?

See you tomorrow!

Adam
Revelation Robotics
Title: Re: Revelation Robotics
Post by: RevRobots on November 03, 2015, 03:00:39 pm
Hi guys,

I just got all of the parts for Justice v2 today. I can finally start building. My hope is to have him done in time to compete at Pennbots' Fall Brawl in order to test him out before Moto.

Adam
Revelation Robotics
Title: Re: Revelation Robotics
Post by: RevRobots on November 23, 2015, 03:45:03 pm
Hi Guys,

I could't get Justice done in time for Fall Brawl, so I decided to bring Bulwark instead. One of the bearing blocks just fell apart because I was pushing a shaft in and out so often. so onto designing a new version of Justice.

So post Pennbots report:

Bulwark went 1-2, beating Spare Parts, and losing to Little Wedge and Cornerstone.

Ophidian went 1-2 also, beating Cornerstone, and losing to Ant n'at, and Spare Parts.

Cornerstone went 4-2 to get 2nd place, beating Trivial Jr., Bulwark, Little Wedge, and Spare Parts, and losing to Ophidian, and Ant n'at in the finals. Cornerstone is also Ranked 6th on Botrank.

Well that a rap for now,
Adam,
Revelation Robotics
Title: Re: Revelation Robotics
Post by: RevRobots on November 26, 2015, 09:26:19 pm
Happy Thanksgiving everybody!

Adam
Revelation Robotics
Title: Re: Revelation Robotics
Post by: Infernaltank on December 01, 2015, 11:25:08 pm
Are you guys going to Motorama 2016?
Title: Re: Revelation Robotics
Post by: RevRobots on December 07, 2015, 07:36:00 am
Yes, I plan to bring some ants, and maybe a beetle... will be posting designs soon!

Adam
Revelation Robotics
Title: Re: Revelation Robotics
Post by: Infernaltank on December 07, 2015, 05:54:21 pm
Yes, I plan to bring some ants, and maybe a beetle... will be posting designs soon!

Adam
Revelation Robotics

That's great! I was worried you guys wouldn't be showing up.
Title: Re: Revelation Robotics
Post by: RevRobots on December 18, 2015, 04:02:10 pm
Hi Guys,

I Just looked back on my robot's records:

Cornerstone 17-8 (Ranked 6),

Justice 6-3 (Ranked 36),

Ophidian 5-8,

Arrow 3-5,

And Bulwark 3-5

Not to shabby. I will be posting drawings of my upcoming 3 pounder, Son of Thunder very soon.

Adam
Revelation Robotics
Title: Re: Revelation Robotics
Post by: RevRobots on December 29, 2015, 02:49:12 pm
Hi Guys,

It’s been a while since I’ve updated this page. So here is what has happened since:

Joe 3D printed a maker bot like Make’s mascot,

(https://revelationrobotics.files.wordpress.com/2015/12/img_0021.jpg?w=614)

For Christmas I got some 1000rpm gearmotors for the upcoming beetleweight: Son of Thunder.

Me and my brother also made DIY gammer kits,

(https://revelationrobotics.files.wordpress.com/2015/12/img_0025.jpg?w=614)

My Dad made an ornament of Ophidian for Joe,

(https://revelationrobotics.files.wordpress.com/2015/12/img_0024.jpg?w=614)

And I also made a cell phone controlled sentry gun.

(https://revelationrobotics.files.wordpress.com/2015/12/img_0010.jpg?w=614)

Merry Christmas and a Happy New year of robot building!

Adam

Revelation Robotics
Title: Re: Revelation Robotics
Post by: Infernaltank on December 31, 2015, 01:17:28 am
It looks like you folks aren't going to be at Motorama. We'll all miss you!
Title: Re: Revelation Robotics
Post by: RevRobots on January 04, 2016, 07:36:12 pm
Hi Guys,

I have a couple questions for my Beetleweight:

1:  Would the shaft of a Kitbots 1000rpm motor be long enough for the 4mm Snap hubs when mounted to a 1/8" piece off Al. with button head 4-40 bolts? If not what about a piece off 1/16" Al.?

2: How would one attach interchangeable wedges to a 1/2" piece of HDPE?

3: What would be better: 2 MiniDUO ESCs http://www.operativerc.com/products-miniduo.html (http://www.operativerc.com/products-miniduo.html), or 4 Tiny ESCs?a

Thanks as always.

Adam
Revelation Robotics
Title: Re: Revelation Robotics
Post by: zacodonnell on January 04, 2016, 09:49:05 pm
That MiniDuo looks slick!  It's cheaper than a pair of fingertech TinyESCs but you won't have spares available at the event if you blow one up. It also isn't likely to be as combat tested. Just some things to consider. I think both would work well for you.

I think the shaft would be long enough when face mounted to 1/16" AL for sure, probably .125" also but that is awfully thick for an inner support on a little robot. I thought I was the only one who did that!

I usually make little plastic clamp mounts for my 1000 RPM motors, which allow me to support the front and back of the motor and adjust the front-to-back alignment of it within the bot easily. It's also easy to swap the motors out if the mounts are two C shaped pieces that pop apart. They can easily be made with a holesaw, some 3/8" UHMW, and a drill press. You could do it with a hand drill but it would be tougher. They do take up a little more space than a face mount though.

-Zac
Title: Re: Revelation Robotics
Post by: AmbientChaos on January 05, 2016, 08:44:38 am
If you haven't ordered them yet, I might hold off on getting the Kitbots motors, they gave me some issues when I tried to use them in my bot (http://sparc.tools/forum/index.php?topic=189.msg2811#msg2811).  Apparently the brushes in them are very electrically noisy and cause ESCs to spaz out even with capacitors to cut down on the noise, but when I switched to a different motor the issue went away.  Both Pololu (https://www.pololu.com/product/3202) and ServoCity (https://www.servocity.com/html/970_rpm_econ_gearmotor__638358.html) now have motors that have a nearly identical form factor to the Kitbots motors.  I can personally attest that the Pololu motors didn't give me the problems of the Kitbots motors, but the new ServoCity motors are intriguing since they are nearly the same price as the Kitbots ones.
Title: Re: Revelation Robotics
Post by: psynnr on January 06, 2016, 05:46:38 am
I currently run the Mini Duo in my Ant bot Bit Vicious with 50:1 pololu motors on 3s battery and have had no issues with them. Even ran 4s on then, but issue with weapon esc not the Mini Duo. Have used them in oven 10 events, 40+ matches on same esc. No calibration issues. Another esc to try is the Scorpion Mini Speed Control from ROVPARTS(http://www.shop.rovparts.com/Scorpion-Mini-Speed-Control-00040.htm). The D2 beetles run 4 B-16's at 3s and 4s, and is $35.
Title: Re: Revelation Robotics
Post by: RevRobots on January 06, 2016, 07:15:02 am
Thanks to Zac, Ambient Chaos, and psynnr for the help,

Would the Scorpion Mini Speed Controller run 4 motors? Has anyone tried this and it not go well?

I also just cut the HDPE front and back bumpers for Son of Thunder and I'm in the processes of cutting the Al. supports/motor mounts. Really, I will post pics. today.

Adam
Revelation Robotics
Title: Re: Revelation Robotics
Post by: AmbientChaos on January 06, 2016, 07:05:53 pm
Looking purely at the numbers for the stall current on the two motors I linked before I might say that it could run four of the ServoCity motors but the Pololu motors might be pushing your luck, and the Kitbots motors don't have much in the way of stats to compare.  Having said all of that, my first design iteration had four of the Kitbots motors hooked up to two Scorpion Wasp (http://www.robotmarketplace.com/products/0-WASP.html) controllers, and it ran them just fine if you don't count the stuttering problem from the brush noise.
Title: Re: Revelation Robotics
Post by: RevRobots on January 06, 2016, 09:21:03 pm
@AmbientChaos,

Just an FYI the motors i have are the kitbots 1000rpm motors. Thanks for the info. though!

All,

Ok, here are some pics. of what I have of Son of Thunder's chassis:

(https://revelationrobotics.files.wordpress.com/2016/01/img_0037.jpg?w=614)
and here:
(https://revelationrobotics.files.wordpress.com/2016/01/img_0036.jpg?w=614)

Tell me what you think.

Adam
Revelation Robotics
Title: Re: Revelation Robotics
Post by: zacodonnell on January 06, 2016, 09:28:53 pm
Looks nice and square.  What are the aluminum braces that go across made of? It looks like they have ribbing at the bottom. That will add a lot of rigidity without adding much weight, which is definitely a good thing.

-Zac
Title: Re: Revelation Robotics
Post by: tomchaps on January 07, 2016, 02:56:17 pm
Is that half-inch UHMW, or 3/8ths? I just ordered my first bar of the stuff, and the 1/2" was heavier than I expected, but I was worried I might not be able to screw into 3/8ths...
Title: Re: Revelation Robotics
Post by: RevRobots on January 08, 2016, 07:25:08 am
@ Zac,

I actually got that Al. from an Al. window frame that my Dad took out during his construction side job. :)

@ tomchaps,

This is 1/2 HDPE, I'm sorry if this caused you to mess up an order or plans you had.

Adam
Revelation Robotics
Title: Re: Revelation Robotics
Post by: RevRobots on January 08, 2016, 01:58:14 pm
Hi Guys,

I have a question, on ROVparts.com under the scorpion speed controller it says: "6.5A continuous (8A peak) current on each channel". I looked at the motor stats for the Servocity and Pololu motors that AmbientChaos suggested, and for the Servocity said that it had 3.8A stall current, and the pololu motor had a 5500 mA stall current. If the Kitbot motors had something near those motors, would i be able to run 4 motors on that speed controller.

I'm sorry if this is confusing.

Adam
Revelation Robotics
Title: Re: Revelation Robotics
Post by: emancarrillo on January 08, 2016, 04:34:30 pm
The ROVParts D2 kits runs 4 of their motors on it and they have a listed stall current of 4.9amps. I'd figure you could run 4 kitbots motors on that board.
Title: Re: Revelation Robotics
Post by: RevRobots on January 12, 2016, 02:47:08 pm
Ok thanks!

Adam
Revelation Robotics
Title: Re: Revelation Robotics
Post by: RevRobots on January 12, 2016, 02:56:02 pm
Hi Guys,

I've made some more progress on Son of Thunder's Chassis:

(https://revelationrobotics.files.wordpress.com/2016/01/img_0039.jpg?w=614)

and,

(https://revelationrobotics.files.wordpress.com/2016/01/img_00421.jpg?w=614)

Sorry of the blurry pic. :P

I sculpted some foam to fit most of the interior components:

(https://revelationrobotics.files.wordpress.com/2016/01/img_00451.jpg?w=614)

The little cardboard things are the dementions of the Battery, and ESC.

Also, my Dad and I also made an anti-drum wedge:

(https://revelationrobotics.files.wordpress.com/2016/01/img_0040.jpg?w=614)

Adam
Revelation Robotics
Title: Re: Revelation Robotics
Post by: RevRobots on January 18, 2016, 05:12:54 pm
Hi Guys,

I just got the ESC the other day, and I just wired it up.

(https://revelationrobotics.files.wordpress.com/2016/01/img_0079.jpg?w=614)

Adam
Revelation Robotics
Title: Re: Revelation Robotics
Post by: zacodonnell on January 18, 2016, 08:49:50 pm
That wiring looks about 800% better than the first wiring you did.  We all get better over time :)

-Zac
Title: Re: Revelation Robotics
Post by: TeamTiki on January 21, 2016, 01:21:18 am
is that solid core wire?  its hard to tell from the pictures?
Title: Re: Revelation Robotics
Post by: RevRobots on January 22, 2016, 02:48:54 pm
@Zac,

Thanks!  :)

@TeamTiki,

Yes that is Solid core wire. It is a lot easier to solder into the motors etc.

All,

A got my Fingertech package the other day. I think I speak for all robot builders when I say that robot goodies makes me happy. :)

Included were:

11.1v 950mAh battery
Medium nutstrip (to mount the attachments)
1mm thick Titanium
and Snap hubs and wheels

Hopefully the JST connectors come tomorrow (but with the blizzard on the way It may not come  :-\) If they do, then I can Have S.O.T. operational by the end of the weekend. :) Also I'm getting started on making the scoop, ram, and anti-drum wedge. Everything right now weighs a little more then 2 lbs.

I also just looked at Dylan's pictures from Moto. and saw Cornerstone. He was so shiny then.

Adam
Revelation Robotics
Title: Re: Revelation Robotics
Post by: RevRobots on January 24, 2016, 06:12:21 pm
Hi Guys,

:D LOTS OF PROGRESS!

(https://revelationrobotics.files.wordpress.com/2016/01/img_0085.jpg?w=614)

Here is the Rammer attachment:

(https://revelationrobotics.files.wordpress.com/2016/01/img_0090.jpg?w=614)

And last but not least, the Scoop attachment:

(https://revelationrobotics.files.wordpress.com/2016/01/img_0089.jpg?w=614)

Tell me what you think.

Adam
Revelation Robotics
Title: Re: Revelation Robotics
Post by: zacodonnell on January 24, 2016, 09:47:49 pm
The rammer will work better if you fold the corners back, and you would probably be better off with hex head bolts or flat head bolts instead of the button heads you're using. They are both more resistant to being jammed in place when they take damage than the buttons are.

Lots of air inside those wheel guards - that can be a very good way to protect wheels.

-Zac
Title: Re: Revelation Robotics
Post by: TeamAstroBot on January 25, 2016, 10:10:50 am
Looking good. My only real suggestion would be "Harden" those gearmotors AND/OR support the backend of the motor can in some way. Gemini used the same 4 motors for 4 competitions and never needed to be replaced. And I never fully "Hardened" them. I only took them apart to loctite the screws. I can't stress how important doing that is. I didn't do that with Scorpius and they didn't last 2 fights before needing to be replaced.
Title: Re: Revelation Robotics
Post by: RevRobots on January 28, 2016, 02:33:29 pm
Zac,

OK, thanks for the advice. I did that this morning.

Team Astrobot,

When you say locktite the motor screws, do you mean the first set of screws? Or, both the first set, and the screws that actually hold the gearbox onto the motor?

All,

This morning I finished the anti-drum wedge. :)

(https://revelationrobotics.files.wordpress.com/2016/01/img_0091.jpg?w=614)

I just have to cut the diamond tread for the top plate, and S.O.T. is ready to compete. Also I have driven S.O.T. around a lot, and I haven't blown anything up yet, so I think I may be doing something right. ;)

Adam
Revelation Robotics
Title: Re: Revelation Robotics
Post by: AmbientChaos on January 28, 2016, 05:53:45 pm
Here is a basic guide to battle hardening motors (http://www.teamrollingthunder.com/Kitbots/Battle_Harden/body_battle_harden.html) so that they will hopefully survive combat conditions for longer.
Title: Re: Revelation Robotics
Post by: RevRobots on January 29, 2016, 07:02:42 am
OK, thanks for the info.

Adam
Revelation Robotics
Title: Re: Revelation Robotics
Post by: RevRobots on January 29, 2016, 07:14:22 am
Hi Guys,

I have a problem, I just pulled Cornerstone out of the place that I stored him over Christmas. I went to charge his battery and the charger said that the batt. was low on voltage and wouldn't charge it. I'm using the Hobby King HKC6, If this terminology is foreign to you, it is the charger that Fingertech use to sell. I also can't find it anywhere on Hobby King's website.

Any advice? I don't have any extra batteries.

Adam
Revelation Robotics
Title: Re: Revelation Robotics
Post by: emancarrillo on January 29, 2016, 01:19:58 pm
Do you have a voltage checker. To know what the cells are at?

Maybe try something like this. Messing with over discharged lipos is a bit risky, but if your in a bind.

http://www.rcgroups.com/forums/showthread.php?t=1072324
Title: Re: Revelation Robotics
Post by: RevRobots on January 29, 2016, 07:03:35 pm
Thanks for the advice! I got it back working!

All,

But with that out of the way, I have another problem. I pulged the batt. in, and I tried to test it. The lights where blinking on the Tiny ESCs like they were receiving a signal, but nothing is happening. Not even the changing of the lights from red to green. I also tried to plug the ESCs into different channels on the Rx. Still nothing, does anyone know what is wrong?

Adam
Revelation Robotics
Title: Re: Revelation Robotics
Post by: FingerTech on January 30, 2016, 02:31:36 am
What voltage is your battery reading now?  It could be possible it's actually still dead but just high enough to power the uC and LEDs of the tinyESC (6V does this - you need 6.5V to power the h-bridge chip).
Title: Re: Revelation Robotics
Post by: RevRobots on January 30, 2016, 09:05:21 am
My batt. is at 7.6v, my dad and I are discharging it and then trying to recharge it, to see if that can get it to 11.1.

Adam
Revelation Robotics
Title: Re: Revelation Robotics
Post by: Coboxite on January 30, 2016, 02:00:01 pm
My batt. is at 7.6v, my dad and I are discharging it and then trying to recharge it, to see if that can get it to 11.1.

Adam
Revelation Robotics
I'm pretty sure your battery is a goner.
Title: Re: Revelation Robotics
Post by: RevRobots on February 01, 2016, 04:09:31 pm
Hi Guys,

The problem with Cornerstone is fixed temporarily. I had ordered a extra scorpion ESC for S.O.T. so I decided to try it out. And it works. I'll try to be in touch with Mr. Wanner to see what the problems were.

But I have some very good news, Son of Thunder is finished!

(https://revelationrobotics.files.wordpress.com/2016/02/img_0092.jpg?w=614)

(https://revelationrobotics.files.wordpress.com/2016/02/img_0093.jpg?w=614)

I just need to bend the wedge a little bit so that it is scraping against the floor, and it is battle ready. :D

Adam
Revelation Robotics
Title: Re: Revelation Robotics
Post by: FingerTech on February 01, 2016, 04:35:15 pm
If your 3S (11.1V) battery is reading 7.6V, it's no good.

Once you've got a good battery, try recalibrating the tinyESC back to defaults. (http://www.fingertechrobotics.com/proddetail.php?prod=ft-tinyESCv2 under the Operation tab.)
I've heard tales of calibration getting screwed up so that motors won't move and I think it has to do with power brownouts, but I've never been able to reproduce it myself.  Recalibrating has always solved it though.
Title: Re: Revelation Robotics
Post by: Badnik96 on February 02, 2016, 10:57:23 am
Son of Thunder looks really solid. It's a shame you won't be going to Moto.
Title: Re: Revelation Robotics
Post by: RevRobots on February 02, 2016, 11:56:15 am
Mr. Wanner,

OK, I will try that sometime.

Dylan,

I originally messed up, but we are actually going to be going to Moto. See you there! :D

Adam
Revelation Robotics
Title: Re: Revelation Robotics
Post by: RevRobots on February 03, 2016, 02:53:31 pm
OK, time for a pre-moto update:

Cornerstone:
I re-calibrated the Tiny ESCs like Mr. Wanner said to, and now they both work. :) I also Got a new 3 cell Lipo battery for him. Should be interesting to see how fast robot meets little arena.  :o

Ophidian:

My brother used the old chassis from the viper based Justice, we just have to give the weapon a test, and then we are all set.

Son of Thunder:
Everything is still OK with the team's newest robot. I can't wait to compete with him.  :)

And since nobody has posted any predictions yet, I though I would start us off:

Fairies:
1st, Demise
2nd, Denise
3rd, Bia

Ants:
1st, Algos/Low Blow
2nd, Whoever loses that ^ fight
3rd, DDT

Beetles:
1st, Silent Spring
2nd, Margin of Safety
3rd, Trilobite/Thunder Child

Adam
Revelation Robotics
Title: Re: Revelation Robotics
Post by: Badnik96 on February 03, 2016, 08:34:43 pm
Oh awesome! What ants are you bringing this time?
Title: Re: Revelation Robotics
Post by: RevRobots on February 04, 2016, 02:10:44 pm
We'll be bringing Cornerstone and Ophidian.  :)

Adam
Revelation Robotics
Title: Re: Revelation Robotics
Post by: RevRobots on February 18, 2016, 04:18:49 pm
Ok, I'm getting everything packed tonight. See everyone tomorrow! :D

Adam
Revelation Robotics
Title: Re: Revelation Robotics
Post by: RevRobots on February 20, 2016, 08:54:43 pm
So, day 1 report.

S.O.T. Is 2-1 beating Speed Wedge 3, and Ghoti. And losing to The Collective. I'm very happy with S.O.T., My first match tomorrow will be against Scrambles the Death Dealer. I'm also happy that I will be able to test 3 of my 4 attachments, and they all have worked well so far.

More to come tomorrow......

Adam
Revelation Robotics
Title: Re: Revelation Robotics
Post by: BranYoung on February 20, 2016, 11:57:57 pm
Excellent work! I think a brick is the ultimate rock in the robot equation ☺. Unfortunately, I will not be there tomorrow since both bots were knocked out and I still have plenty of work for school do Monday. Best of luck!
Title: Re: Revelation Robotics
Post by: RevRobots on February 23, 2016, 03:15:45 pm
Event Report:

Cornerstone,

Fight 1 v Vile Ant

Here is what I'm thinking: https://www.youtube.com/watch?v=iHpzPtlu1xY

The fight went better then I thought, Vile Ant took almost all of the foam off of the wheels but I still kept moving. Words can't really do justice for what happened. It was a good try, but Vile Ant took the victory.

Fight 2 v Firearrow

This was no joke the closest fight of the day. Firearrow and I traded blows very evenly until the end of the match. But after at least a minute or two, the split decision came on for Firearrow.

Cornerstone ends the day with a 0-2 record  :-[

Ophidian:

Fight 1 v Viciously Circular

Well Joe got to fight the newly renovated VC. Joe and Nate hit each other in some way that Nate was on his back, and Joe had a motor shaft bent. Score one for Ophidian!

Fight 2 v Hercules

I don't remember much about this fight, the only thing I do remember is that Herc. won.

Fight 3 v Poco Tambor

This fight was the battle of the non-moving wonders, poco got one hit in and Joe got no hits in, that's why Poco won.

Ophidian ends with an 1-2 record.

Son of Thunder:

Fight 1 v Speed Wedge 3

Yes, for the first fight of S.O.T.'s career, he fights the reining champ. Speed Wedge was domonating but something with his Tx/Rx went screwy and it unbound. Hey, a win's a win and I'll take it (unless it is a forfeit :P).

Fight 2 v The Collective

This was my worst fight since this: https://www.youtube.com/watch?v=3nN9QGgfvrY (https://www.youtube.com/watch?v=3nN9QGgfvrY)
I could not drive, I found out later the combo. of the wood screws that held on the bottom plate were rubbing the floor, and the wheels had gunk all over them resulting in very poor traction. https://www.youtube.com/watch?v=iHpzPtlu1xY (https://www.youtube.com/watch?v=iHpzPtlu1xY)

Fight 3 v Ghoti

Holy Mackerel I got to fight a bot from Georgia Tech! One of the first hits I got flipped over, but I could still drive upside down, and stayed so until the match ended. Eventually, Ghoti flipped himself over because his bar bent. He did give Ti. ram a little bit of polishing. ;)

Fight 4 v Scrambles

Darn, Scrambles knocked off the backs of 3 of the 4 motors, guess I for got about the battle hardening page. :P But we did get all of the motor caps back on in time to go into the rumble. needless to say, Scrambles won.

S.O.T. has a 2-2 record  :)

The Beetle Rumble:

Not much happened, I pushed some people around, then Ghoti in I got stuck together in a slit in the wheel guard that Scrambles made, eventually Wedge of Allegiance got us unstuck. BEST KOREA!!!!!!! won the rumble.

I had a great time at Moto. this year. Thanks to everyone who helped get this show on the road. Also thanks to Mike and Julie for take all of the footage of the event.

Some upcoming developments:

- Rebuilding Justice
- Making some new attachments for S.O.T.
- Get some Latex paint to put on the wheels
- Make a new wedge for Cornerstone
- Get some real UHMW for the plastic battering ram

I also had fun seeing everyone again. :)

Here are the links to My fights:
Cornerstone v Vile Ant: https://www.youtube.com/watch?v=WS9XbGFoNTw (https://www.youtube.com/watch?v=WS9XbGFoNTw)
Cornerstone v Firearrow: https://www.youtube.com/watch?v=9sy5gAoLil8 (https://www.youtube.com/watch?v=9sy5gAoLil8)
Ophidian v Viciously Circular: https://www.youtube.com/watch?v=X6AgWes-wgE (https://www.youtube.com/watch?v=X6AgWes-wgE)
Ophidian v Hercules: https://www.youtube.com/watch?v=KyrWf1kkLYE (https://www.youtube.com/watch?v=KyrWf1kkLYE)
Ophidian v Poco Tambor: https://www.youtube.com/watch?v=PZGfJKjaKms (https://www.youtube.com/watch?v=PZGfJKjaKms)
S.O.T. v Speed Wedge 3: https://www.youtube.com/watch?v=rrm6b6BD4iY (https://www.youtube.com/watch?v=rrm6b6BD4iY)
S.O.T. v The Collective: https://www.youtube.com/watch?v=vDWvcC1rTak (https://www.youtube.com/watch?v=vDWvcC1rTak)
S.O.T. v Ghoti: https://www.youtube.com/watch?v=wBs2VwL3NT8 (https://www.youtube.com/watch?v=wBs2VwL3NT8)
S.O.T. v Scrambles: https://www.youtube.com/watch?v=S2Jx0gwtoRg (https://www.youtube.com/watch?v=S2Jx0gwtoRg)

Adam
Revelation Robotics
Title: Re: Revelation Robotics
Post by: Infernaltank on February 23, 2016, 03:54:10 pm
Don't forget to battle harden the motors!
Title: Re: Revelation Robotics
Post by: RevRobots on February 25, 2016, 04:29:34 pm
Fellow Robot Builders,

I am attempting to get Justice from the P.O.P. (pile of parts) stage, to a fully functional robot. Instead of using the old steal bar that my dad cut, I changed over to a chipper blade that I originally got the Viper element of Justice V2 that was short lived. Pictures to come shortly. :)

Adam
Revelation Robotics
Title: Re: Revelation Robotics
Post by: RevRobots on February 26, 2016, 02:09:48 pm
Hey,

Here are the pictures of Justice.

(https://revelationrobotics.files.wordpress.com/2016/02/img_0150.jpg?w=303&h=404&crop=1)

(https://revelationrobotics.files.wordpress.com/2016/02/img_0151.jpg?w=303&h=404&crop=1)

I left that back plate on an angle to (hopefully) deflect blows from horizontal spinners.

Thoughts?

Adam
Revelation Robotics
Title: Re: Revelation Robotics
Post by: zacodonnell on February 27, 2016, 06:25:09 pm
That front wedge looks great, and I think leaving the back sticking out will help with the horizontal spinners some.  It might be worthwhile to try to support the drive motors a little bit. Even some heat shrink / shoe goo across the joint with their gearboxes would help their reliability.

Is it invertable?  Did you ever fix the issue with the blade popping off when you hit a wedge?

-Zac
Title: Re: Revelation Robotics
Post by: Headbanger142 on February 27, 2016, 07:31:29 pm
I'd recommend getting a new hub for the blade. Those fingertech ones aren't very good.
Title: Re: Revelation Robotics
Post by: RevRobots on February 28, 2016, 12:36:09 pm
Yeah, at Bot Blast the brushless was spinning the wrong way in order for the blade hub to work properly, so after the first good hit, it popped it right off. I made sure that it was spinning the right way this time. Depending on what happens at the next competition, I may change the hub.

Adam
Revelation Robotics
Title: Re: Revelation Robotics
Post by: RevRobots on March 02, 2016, 03:30:41 pm
Boredom is the Mother of Robotic invention. I thought you guys would get a kick out of this:

(https://revelationrobotics.files.wordpress.com/2016/03/img_0158.jpg?w=388&h=291&crop=1)
(https://revelationrobotics.files.wordpress.com/2016/03/img_0156.jpg?w=218&h=291&crop=1)
(https://revelationrobotics.files.wordpress.com/2016/03/img_0157.jpg?w=610&h=813&crop=1)

I fooled around with some hot glue.

Adam
Revelation Robotics

DISCLAIMER: These are prototypes. ;)
Title: Re: Revelation Robotics
Post by: RevRobots on March 11, 2016, 03:06:00 pm
So,

Upgrades people upgrades:

Son of Thunder:

1/2 UHMW front and back as opposed to HDPE, UHMW wheel guards, UHMW ram, Also I'm cutting down the thickness of the bot from 2", to 1 1/2", and in my case, 2 - 1/2 = more wheel traction. Yay!

Cornerstone:

The only thing I'm going to change on Cornerstone is make a new wedge out of 1mm Ti., man that wedge took a beating...

Ophidian:

Joe is thinking of a design to replace Ophidian with, something he can make himself. This is what he wants:

http://antparts.magnets4yourhealth.com/bot_page_t.html (http://antparts.magnets4yourhealth.com/bot_page_t.html)

Thoughts?

Adam
Revelation Robotics
Title: Re: Revelation Robotics
Post by: RevRobots on April 03, 2016, 04:20:44 pm
Ok so a pre-PennTech report:

Son Of Thunder:

I made the new front and back bumpers, now SOT has LOTS of clearance. No more getting stuck on the floor.  :D

Cornerstone:

I made new wheel-guard, not much was done beside that. If I get the Ti. before the event, then I'll try to make the new wedge, but if it doesn't happen I won't be upset.

Arrow:

I made new longer wedge things for the thwacker. but other then that it is unchanged.

Justice:

As it turns out, Justice had some ESC problems so I robbed the ESCs out of Ophidian for now. I don't know what was happening, the ESCs would drive the motor one way, but not the other. Do you guys know the problem?

That's all for now

Adam
Revelation Robotics
Title: Re: Revelation Robotics
Post by: RevRobots on April 03, 2016, 05:20:33 pm
Also I forgot to mention something:

Upcoming fairyweight Millstone!

I'm having it 3d printed, and it should look something like this:
(https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcQD3AZx9zwEycn2zy8Agg-hd43V6SmrlixGe9BxezLl2otHCT9U)

Should be fun!

Adam
Revelation Robotics
Title: Re: Revelation Robotics
Post by: Infernaltank on April 03, 2016, 09:25:35 pm
YES I helped the fairyweight class grow in the US!
Title: Re: Revelation Robotics
Post by: RevRobots on April 08, 2016, 02:43:03 pm
Just got everything packed up for S.W.O.R.D. tomorrow. see you guys then.  :D

Adam
Revelation Robotics
Title: Re: Revelation Robotics
Post by: RevRobots on April 10, 2016, 07:30:46 pm
Hey,

I had a great time at the S.W.O.R.D. event yesterday. Thanks to Kyle, Alex, and everyone else that made it happen.

I don't know how to put the bots' records, because we did an interesting format. We had three bots in the arena at once and it went from there. But I'll let Kyle explain it in more detail.

Arrow:
Arrow did pretty well, but he didn't make it into the final 4. Joe is still throwing around robot ideas that include: Something like Pussycat from Robot Wars, Legitizing Eagle, and something like DPMI with a drum on the back.

Cornerstone:
Cornerstone made it into the final 4 and got 3rd place. I ended up getting the Ti. in the mail the day of the event. I will have the new wedge done in time for Pennbots though.

Justice:
Despite not being Justice's best performance, he won both matches in the final 4 earning a 1st place finish. I definitely need to do something about the bar...

Son of Thunder:
SOT made it to the final four where it faced Alex's bot. But just as I was going to push him into the pit, he turned and I drove right in. SOT definitely showed some promise, standing up to Scrambles, and Dick Dastardly using the 1mm Ti. plow. Will be posting pics. of the damage soon...

All and all, it was a great event. It was low key, but still fun and competitive. Thanks again to Kyle and Alex for putting this thing on.

I have a few questions:
1) How can I attach the bar on Justice better (but still be removable).
2) How can I make SOT faster. I noticed that Alex's bot used the same motors as me, but he was still faster then me. I know that switching the batt. voltage from 11.1 to 14.9 (or whatever) would help, but is there anything else?

Also UPDATE on Millstone:

The chassis is done printing, and I will be picking it up soon. but here is a teaser pic for now:
(https://3dhubs.s3-eu-west-1.amazonaws.com/s3fs-public/order/attachments/IMG_3341[1].JPG)

Adam
Revelation Robotics
Title: Re: Revelation Robotics
Post by: Infernaltank on April 10, 2016, 08:07:41 pm
Will Millstone be at Motorama next year?
Title: Re: Revelation Robotics
Post by: TeamAstroBot on April 11, 2016, 10:40:58 am
Wait, there was a S.W.O.R.D. Event? I missed it? What the heck?
Title: Re: Revelation Robotics
Post by: RevRobots on April 11, 2016, 03:51:04 pm
@Nate

Hopefully yes, the plan is to work out all of the kinks at the two remaining pennbot's tournaments, then se how muck Ti. I can add to survive Demise.

@Astrobot

Yes there was an event. It was this past Sat. at Penn college of technology. Alex took video with his go pro or whatever that might be up on youtube.

Adam
Revelation Robotics
Title: Re: Revelation Robotics
Post by: Infernaltank on April 11, 2016, 08:35:36 pm
Wait, there was a S.W.O.R.D. Event? I missed it? What the heck?

The event wasn't announced that far in advance so it's understandable that you missed it. (I knew about it but I wasn't able to make it)
Title: Re: Revelation Robotics
Post by: TeamAstroBot on April 11, 2016, 10:30:56 pm
I literally live 20 mins from Penn Tech. Bummer! Where was it announced? I didn't see anything on here or builders?
Title: Re: Revelation Robotics
Post by: Infernaltank on April 11, 2016, 10:44:52 pm
I literally live 20 mins from Penn Tech. Bummer! Where was it announced? I didn't see anything on here or builders?

It was here and in the facebook group.

http://sparc.tools/forum/index.php?topic=330.0
Title: Re: Revelation Robotics
Post by: RevRobots on April 16, 2016, 06:06:42 pm
Hey,

New bot! Millstone:

(https://revelationrobotics.files.wordpress.com/2016/04/img_02482.jpg?w=614)

I didn't have any Bananas on me, so I used Cornerstone for size reference:

(https://revelationrobotics.files.wordpress.com/2016/04/img_02492.jpg?w=614&h=819)

He weighs in @ 144g. The plan is to get the kinks worked out at the two Pennbots events in between now and Moto., then see how much Ti. I can put on to face Demise.

Questions/Concerns?

Adam
Revelation Robotics

P.S. I got a spare chassis from the guy who printed it, because he didn't like how the supports came off, and he wasn't going to do anything with it. :)
Title: Re: Revelation Robotics
Post by: Infernaltank on April 17, 2016, 10:51:00 am
How fast is it?
Title: Re: Revelation Robotics
Post by: Green machines on April 17, 2016, 11:22:20 am
Looks good! Can't wait to see it in action!
Title: Re: Revelation Robotics
Post by: RevRobots on April 17, 2016, 02:38:05 pm
It can travel a foot in .78 seconds.

Adam
Revelation Robotics
Title: Re: Revelation Robotics
Post by: RevRobots on April 20, 2016, 06:00:28 pm
Does anybody know if Bot Blast is happening this year?

Adam
Revelation Robotics
Title: Re: Revelation Robotics
Post by: AmbientChaos on April 21, 2016, 12:15:11 pm
I've been wondering the same thing. I haven't seen any mention of a date for it this year, and my email a couple of weeks ago asking if it would be happening this year has so far gone unanswered.
Title: Re: Revelation Robotics
Post by: TeamAstroBot on April 22, 2016, 10:04:31 am
I've heard from Jeremy last week that he WILL be running Bot Blast this year as usual. He just hasn't had to opportunity to get it posted on BuildersDB yet.

As far as dates go, history would tell us to expect something around the middle of July. However, I don't know of a confirmed date either.
Title: Re: Revelation Robotics
Post by: Badnik96 on April 22, 2016, 02:29:50 pm
Thank goodness. I was getting nervous there for a while.
Title: Re: Revelation Robotics
Post by: RevRobots on April 22, 2016, 03:52:09 pm
According to the past two years, this year's Bot Blast should be the 16th. Thats just guestimation though...

Also other big news, I just ordered the Wanhao Duplicator i3 3D printer! I'm very exited. I'll definitely keep you guys in the loop on how things are going.

Adam
Revelation Robotics
Title: Re: Revelation Robotics
Post by: AmbientChaos on April 23, 2016, 05:13:59 pm
I'll definitely be interested to hear how things go with the Duplicator, I think my current plan is to get one before the end of the year as well.
Title: Re: Revelation Robotics
Post by: Koolaid64 on April 26, 2016, 04:45:27 pm
As for the SWORD event format we did a Knockout tournament, rules  HERE. (http://www.fightingrobots.co.uk/documents/Competition-Regulations.pdf) We did four rounds of qualifiers then the top four in points were put into a single elimination shoot out.

-Kyle
Title: Re: Revelation Robotics
Post by: RevRobots on April 28, 2016, 04:31:19 pm
Hey guys,

So lots of progress with my 3D printer. I got the printer on Monday, and I have been printing almost ever since. I'm currently trying out my first print with ABS. This thing prints great. The one setback I had was getting the test filament out, and getting the new filament in. But I didn't have a problem with that though since I have a basic knowledge of mechanics. Anyone one this forum should be able to fix that if that happens. I'll be away camping this weekend, but once I get back I will post some pictures of the prints I've made.

Adam
Revelation Robotics
Title: Re: Revelation Robotics
Post by: RevRobots on May 03, 2016, 11:50:38 am
Does anyone know where to get a custom drum for an ant machined?

Adam
Revelation Robotics
Title: Re: Revelation Robotics
Post by: zacodonnell on May 03, 2016, 12:21:36 pm
I bet Pete smith would consider it. Especially if it is similar to the kitbots. Otherwise I've ised Whyachi in the past sometimes.

Zac
Title: Re: Revelation Robotics
Post by: RevRobots on May 03, 2016, 02:28:08 pm
Thanks Zac, I'll look into that.

Adam
Revelation Robotics
Title: Re: Revelation Robotics
Post by: RevRobots on May 03, 2016, 02:33:30 pm
Hey guys,

so I finally have some pics. of the 3D printer and (some) of it's creations:

(https://revelationrobotics.files.wordpress.com/2016/05/img_0256.jpg?w=614)

If you ask how it prints, take a look at this:  :P

(https://revelationrobotics.files.wordpress.com/2016/05/img_1148.jpg?w=614)

Also, here is a pic of an all night print of my brother's still unnamed drumbot...

(https://revelationrobotics.files.wordpress.com/2016/05/img_0264.jpg?w=614)

I also printed a cool scale design of an asymmetric disk that I designed in Inventor. Pic. later.

The only other thing I could want is that the filament wasn't pink. Oh well, It was a good deal though.  :P

Adam
Revelation Robotics
Title: Re: Revelation Robotics
Post by: AmbientChaos on May 09, 2016, 03:26:41 pm
It looks like Bot Blast 2016 is finally up on BuildersDatabase, and registration is open.
Title: Re: Revelation Robotics
Post by: RevRobots on May 15, 2016, 02:49:38 pm
So,

Pennbots report:

Ophidian:

Sadly Ophidian went 0-2 again leading us to think about a new robot for Joe.

Justice:

I forget if Justice went 1-2 or 2-2, but anyway he got 4th place. I am desperately waiting for the new blade hubs.

Cornerstone:

Again, I forget if he went 3-2, or 2-2. Cornerstone made it to the finals undefeated but then lost promptly two times in a row to Little wedge. I guess I'm going to have to sharpen that wedge more...

SOT:

Son of thunder preformed very well, beating sidewinder and chopstick (also known as wiz-bang) before losing in a very close Judges' decision to Devastating Moment in the final. I also got to use the anti-drum attachment and worked very well.

Millstone:

If SOT performed well, then Millstone wrecked shop. An early driving error put him in the pit, but he came back to win three more matches in a row, also wining the rumble, to get first place. I think one of the major advantages Millstone had was the treads. No matter what, he always had the most tread on the floor then anyone else. Now I just need to build a Ti. wedge to defend against Demise.

For prizes I got a pair of 41:1 Maxons, a brushless, and a set of Zumo treads, which is what Millstone uses. :P

I really want to build a Antweight gloomy withe parts I got. But I have to take care of Joe's new bot first. Also thanks to Joey for taking all of the video.

Adam
Revelation Robotics
Title: Re: Revelation Robotics
Post by: RevRobots on May 25, 2016, 08:53:07 pm
OK, I haven't posted here in a while, so here is what you missed:

1lb. Gloomy is here!

(https://revelationrobotics.files.wordpress.com/2016/05/img_0318.jpg?w=614)

I don't have a name yet and I need to do some tweaks. And this version will be overweight. But the next version will be 3D printed.

And the biggest part of the update, The Mill/Lathe Combo!

(https://revelationrobotics.files.wordpress.com/2016/05/img_0319.jpg?w=614)

So, at 13 I have a 3D printer, a Mill, And a Lathe. Wow.

Do you guys know of a place that I could get good tips to start milling or Latheing (is that the right term?) like the 10 commandments of milling, or something?

Adam
Revelation Robotics
Title: Re: Revelation Robotics
Post by: Camo5 on May 25, 2016, 11:31:56 pm
Go slow, recheck measurements and tool positions, make sure everything is secure, no loose or baggy anything on your person, I am far too jealous to consider thinking about.
Title: Re: Revelation Robotics
Post by: Badnik96 on May 27, 2016, 07:38:54 pm
1lb Gloomy looks a little top-heavy. If you have weight in the 3d printed version I'd recommend some UHMW strips sticking out the front to make some kind of dustpan.
Title: Re: Revelation Robotics
Post by: BranYoung on June 02, 2016, 12:52:45 am
Where did you find a mill/lathe?  :o
Title: Re: Revelation Robotics
Post by: Infernaltank on June 06, 2016, 08:13:44 pm
You wanna have a look at my old machine tool textbook at Bot Blast? It's got some great stuff on lathe and milling techniques.
Title: Re: Revelation Robotics
Post by: RevRobots on June 08, 2016, 03:35:27 pm
@Camo5,

Thanks for the tips. :)

@Dylan,

Yeah, it's a little top heavy. Since then I've: printed the chassis, Jb-welded it together, put all the guts in, and added an anti-wheely stick. I only have about a quarter ounce left. :(

@Brandon,

My dad found it on craigslist for $700.

@Nate,

Yes, I'd love to take a look at your old machine textbook @ Bot Blast. Thanks!

Adam
Revelation Robotics
Title: Re: Revelation Robotics
Post by: RevRobots on July 10, 2016, 03:36:36 pm
Allright! It's time for a pre-Bot Blast report:

First, NEW BOT Scythe:

(https://revelationrobotics.files.wordpress.com/2016/07/img_0427.jpg?w=614)

Yep, our first drum-bot. My dad and I made the drum ourselves.

Also, I have a rough layout of a Sportsman hammerbot:

(https://revelationrobotics.files.wordpress.com/2016/07/img_0426.jpg?w=614)

What Batteries do you guys use in Sportsmans?

Besides that, Cornerstone, S.O.T., and Deus Ex Machina are unchanged.

Adam
Revelation Robotics
Title: Re: Revelation Robotics
Post by: RevRobots on July 18, 2016, 03:05:37 pm
Bot Blast went OK, here's how I did (part 1):

Scythe (1-1)

The chassis held up well in the first fight against Commander Doom, but that was before it met DDT. there were a few minor hits, then BOOM! I re-watched the fight, they met about the center, then Scythe slides to the wall and DDT is thrown about a foot in the air. I'll have to watch all the fights, but that hit was arguably the biggest hit in the ants that day.

Deus Ex Machinia (0-2)

Deus fell apart in it's first fight, and it's battery died in the second fight. But it was entertaining though!

Part 2 to come soon.....
Title: Re: Revelation Robotics
Post by: Green machines on July 22, 2016, 03:47:50 pm
Hope to see you at FI.
Title: Re: Revelation Robotics
Post by: RevRobots on July 27, 2016, 02:27:25 pm
Alright, aftera week of camping here is part 2:

Cornerstone (0-2):

So I managed to kill two battery's, I resurrected one, and one became a zombie (1 cell was dead). That one was in Cornerstone. It lost it's 1st fight against Aries, one Cornerstone's poorest performances. Then lost to The Cuban. Not a good day for Cornerstone.

S.O.T. (3-2):

S.O.T. got manhandled by Riptoff 3, but then preceded to beat: Attack of the Clone, Can I Haz Markforged, and Crazy Monkey before losing again to Circuit breaker. I looked and I ended up getting 5th place in the beetles, not bad.

I will be giving updates soon on some other stuff I'm working on....

Adam
Revelation Robotics

P.S. Kyle, what were the specs. on the batt. you loaned me? It worked well so I want to buy a clone.
Title: Re: Revelation Robotics
Post by: Koolaid64 on August 03, 2016, 10:33:51 pm
it was a 1000mah 3 cell

-Kyle
Title: Re: Revelation Robotics
Post by: RevRobots on August 04, 2016, 07:52:45 am
Ok, thanks  :D
Title: Re: Revelation Robotics
Post by: RevRobots on August 14, 2016, 04:55:39 pm
I'm building a sportsman hammerbot for possibly Moto, the name is Primus. What ESC would you guys use to power an EV warrior motor? I've seen the Ragebridge being used, but I want to make sure that I'm not wasting $200. Also, should I go for a high mAh 4s battery, or one 4s batt. for the drive and one for the hammer. Once I get going, I'll post some pics. for you. ;)

Adam

Revelation Robotics
Title: Re: Revelation Robotics
Post by: Team whanton2 on August 20, 2016, 10:43:31 pm
just use the new victors.
Title: Re: Revelation Robotics
Post by: RevRobots on August 21, 2016, 07:26:33 am
This one? http://www.vexrobotics.com/vexpro/motors-electronics/217-9090.html
Title: Re: Revelation Robotics
Post by: Team whanton2 on August 21, 2016, 11:08:57 am
I'd get the talon Sr if you ever want to run 24 volts.
Title: Re: Revelation Robotics
Post by: thesaxmachine on September 19, 2016, 06:18:32 pm
Congrats on completing that drum spinner.  And well done driving as well.  Sorry for not replying your message sooner I don't go on this forum much.
Title: Re: Revelation Robotics
Post by: RevRobots on September 21, 2016, 01:48:56 pm
Thanks!
Title: Re: Revelation Robotics
Post by: RevRobots on September 21, 2016, 02:25:44 pm
Whoa! Wait a minute, it's been a while I've been on here. Since everyone seems to be doing a pre-Franklin report, I may as well do one myself.

Cornerstone:

Nothing is really different about Cornerstone this time around. The only thing is that I haven't killed a battery yet.  :P

Justice:

I put some new, more grippy wheels on Justice. Hopefully, this will be the first competition that he will be at full 100%.

Scythe:

I printed a new chassis with some tweaked settings (2mm shell). and I put some screws on to keep the drum from hitting the ground. And I put a coat of black sharpie-armor on it.

Looking farther, to Moto. I will be there with a Sportsman, a new beetle, and an ant. On the beetle note, I'm going to be using this: https://vimeo.com/183675111.

Adam
Revelation Robotics
Title: Re: Revelation Robotics
Post by: TeamAstroBot on September 22, 2016, 10:22:29 am
Adam,

on Scythe, how dense is the infill printed?

We started out printing SOLID prints with ABS filament. But have since moved on to about 15-20% infill with ABS filament. You can see the 15% infill in the below photo of the new Aries chassis being printed.
(https://dl.dropboxusercontent.com/u/1598274/2016-09-19%2019.19.39.jpg)

Title: Re: Revelation Robotics
Post by: RevRobots on September 22, 2016, 01:28:31 pm
I don't remember exactly, but I think it was 25% infill with a 2mm shell. Before that, I had 25% infill with 1mm shell.

Adam
Revelation Robotics
Title: Re: Revelation Robotics
Post by: RevRobots on October 11, 2016, 07:02:15 pm
Here is my FI event report: https://revelationrobotics.wordpress.com/2016/10/11/franklin-institute-event-report/

Details will come soon...

Adam
Revelation Robotics
Title: Re: Revelation Robotics
Post by: RevRobots on October 13, 2016, 03:41:55 pm
Hey,

After Franklin, I wanted to build a more reliable spinner. So I got on Autodesk Inventor and played around with a few disk designs and this is what I came up with:

(https://revelationrobotics.files.wordpress.com/2016/10/img_0628.jpg?w=614)

The robot design is going to be similar to Bombshell with it's disk attachment. After seeing how well it preformed against drum spinners, I thought it could be translated to the ant/beetle (I’m hoping ant) weight class very well.

Adam

Revelation Robotics
Title: Re: Revelation Robotics
Post by: Koolaid64 on October 14, 2016, 07:53:41 pm
Just make sure you put large radii on all your inside corners. This will make it last much longer.

-Kyle
Title: Re: Revelation Robotics
Post by: RevRobots on November 11, 2016, 08:07:31 am
OK, let's back up a bit, at the beginning of the week, I was working on Cornerstone's wedge. But now, it's all messed up and wouldn't get under Don't Ask. So now, here I am with a non-functional Cornerstone. What's one to do? Build another one of course!

Behold the BEHEMOTH!

(https://revelationrobotics.files.wordpress.com/2016/11/img_0637.jpg?w=614)

Yeah I know it's kind of a rip-off, but I was already out of ideas. But what do you guys think?

Adam
Revelation Robotics
Title: Re: Revelation Robotics
Post by: Beaverbotics2 on November 11, 2016, 11:33:14 am
Last minute Robots FTW!

Looks good. Pretty simple, yet easy to maintain.

PS-Did you use a heat gun to bend the lexan or just by hand?
Title: Re: Revelation Robotics
Post by: RevRobots on November 12, 2016, 06:07:45 pm
I bent it by using a huge vice that my dad got for me.

Adam
Revelation Robotics
Title: Re: Revelation Robotics
Post by: RevRobots on November 12, 2016, 08:41:14 pm
Alright, event report. This was a really fun event, super chill and a lot of great people, would definitely recommend this event to anybody that wants to come. It also just had a very good turnout  Now on to bots!

Millstone 2-1:

Millstone didn't quite live up to my expectations, the treads didn't really get much grip. First up was Little Tin Can, a mauler style spinner. After a few hits, LTC was upside-down and couldn't self-right. Then was Bar Buster, Right off the bat I drove him right to the pit, but I drove into the pit, dummy. Next I faced Baby B, after a classic ole move, he ended up in the pit. I ended up getting 2nd place, I will talk about what need's to be done at the end of this post.

Scythe (wedge version) 1-2:

Within 24 hrs. of the event I put a Ti. wedge on Scythe for Joe. It's first fight was against Discharge, Joe drove around a little bit before they stalemated and Discharge pushed him into the pit. His second fight was against Plump, or who I like to call, the lifting screwdriver of DOOM! Yeah, that's all it was. Scythe and Plump pushed each other around for a little bit with Scythe coming out on top. Next, Joe faced me and Justice, I will have a separate section at the end for when RevRobots faced each other.

Justice 4-2:

Holy cow, Justice was actually reliable! After Franklin, I noticed that some stuff was rubbing against the brushless, causing starting issues. But I cleared that up before this event. I am also using the new Blade hub. Justice's First fight was against Commander Doom, A viper lifter driven by a very skilled young man. I got a few nice shots in before one massive hit sent C.D. into the pit. Up next was Spare Parts 2, it was kind of like last time I faced him: Hit, get clamped, pit. So, yeah. Next, was Scythe and I will talk about it later. Then was Verbal Irony, a wedged vertical spinner, The was by far the fight of the day for Justice. I got under V.I. wedge the whole fight, within the 30 second mark, I pinned and took off both wheels. The Next fight was against Lil Flipsy, a Ti. clad lifter. After a couple hits, I drove him close to the pit and he tried to get me to drive into the pit, I stopped just in time, and finished him off. Next, was Behemoth, and I will also talk about this later. Justice for once was AWESOME to drive, and I look forward to the next competition that he attends

Behemoth 6-2:

My oh my, Behemoth preformed great. It easily the lowest wedge in the competition. My first fight was against Plump, after a little bit I pushed him into the pit. Next was Spare Parts 2, I pushed him, he pushed me, then I pushed him near the pit, be before he fell in, I fell in giving the match to Spare Parts 2. Then I fought Commander Doom again. His lifter was not on the ground giving me the advantage, I eventually pitted him. Behemoth's next fight was against Crocbot, who is another lifter. He also could get his lifter flush to the ground, Giving another easy win for Behemoth. After that I faced Weed Whacker, this bot had trouble with it's belt falling off all day, and it fell of again now. A few complications later, and another win goes to Behemoth. Next, I won against Spare Parts 2, Yea! Then, I fought Justice which I will cover later. In the losers final I faced Recharge I was able to get under him easily, but good driving made it difficult to capitalize on it. Eventually, I was able to get Recharge into the pit. Now I'm in the finals against Discharge, who hasn't lost a fight all day. In the first fight, I was able to get under him and drive him into the pit. Round 2. Sadly, the next fight He got under me and did the same thing.

Man, that was longer then I though it would be. The final results for Revelation Robotics was: Millstone 2nd, Justice 4th, and Behemoth 2nd. On a side note, this is the third time in a row that I have gotten second place at this event, darn. I won a sweet new brushless that I will probably use in the Bombshell style vertical spinner. I will also be posting bot rank results. All in all another great day of robot fighting.

Adam
Revelation Robotics
Title: Re: Revelation Robotics
Post by: Infernaltank on November 13, 2016, 01:09:52 pm
I think I mentioned this to you at Franklin, but you got some praise on the Australian combat robotics forum.

http://robowars.org/forum/viewtopic.php?t=2163
Title: Re: Revelation Robotics
Post by: RevRobots on January 11, 2017, 02:36:09 pm
Since everyone seems to be doing sportsman reports, I may as well through my hat into the ring.

This is the P.O.P. that is Primus: (https://revelationrobotics.files.wordpress.com/2017/01/primus1.jpg?w=614)
Primus is Latin for first, I thought it appropriate since this is my first sport. The top is going to be steel, the hammer motor is an EV warrior, and the sprockets are going to be from an old bike.

Thoughts/suggestions?

Adam
Revelation Robotics
Title: Re: Revelation Robotics
Post by: zacodonnell on January 15, 2017, 09:56:40 pm
How big is Primus? If that's an EV Warrior at the bottom then it must be HUGE. Air can make decent armor if you can ensure that there's always a little of it between your guts and the other bot's weapon...

-Zac
Title: Re: Revelation Robotics
Post by: RevRobots on February 07, 2017, 04:31:27 pm
@Zac

Primus is about 30" x 14 1/2" x 12"
Title: Re: Revelation Robotics
Post by: RevRobots on February 07, 2017, 04:37:48 pm
Hey guys,

It's been while since I've posted on here.

Recently, I put a new wedge on Cornerstone. The wedge is steel painted black from a prior use.

(https://revelationrobotics.files.wordpress.com/2017/02/img_0804.jpg?w=614)

Another thing, I just mounted the motor in Primus. Progress!

Adam
Revelation Robotics
Title: Re: Revelation Robotics
Post by: zacodonnell on February 07, 2017, 06:09:43 pm
Have you done a weight check on Primus? That's a big robot!

-Zac
Title: Re: Revelation Robotics
Post by: RevRobots on February 15, 2017, 02:38:09 pm
Hey guys, I need some help. Can I use a Fingertech switch for one of these batteries? https://hobbyking.com/en_us/rhino-2250mah-3s-11-1v-25c-lipoly-pack.html.

I know I haven't been updating this thread, but you guys will get the full scoop this weekend. But suffice it to say I may need some help tweaking Primus.

Adam
Revelation Robotics
Title: Re: Revelation Robotics
Post by: TeamAstroBot on February 15, 2017, 02:42:12 pm
I would imagine it would depend more on the amount of current you are pulling through it.


http://www.fingertechrobotics.com/proddetail.php?prod=ft-mini-switch

Current Ratings (using 16-gauge wire):
Rated Current: 40A
Burst: 100A for 10 seconds
Title: Re: Revelation Robotics
Post by: zacodonnell on February 15, 2017, 07:04:00 pm
Like he said, the limiting factor is how much current you're pulling through it. You might be better off setting up a removable link (basically a plug that bridges the connection between two points on the same wire). 

If you're running an EV warrior for the hammer it is going to draw quite a bit of current at the end of the stroke. I would say you can expect more than 50A from it even at 11v.  The fingertech switch might be able to do it but with the drive current involved too and no automatic control over the hammer limits I wouldn't trust it. I can probably help you set up a link on Friday if you need it.

-Zac
Title: Re: Revelation Robotics
Post by: RevRobots on February 16, 2017, 12:27:11 pm
I was able to do some axe testing last night and this morning before I packed. Here is a small teaser:

(https://a.thumbs.redditmedia.com/kOxpQ3joCwxGt5o31Ni-mJtx5gExOzY87HB8j2ppA-8.jpg)

(The blurry pic adds to the mystery :P)

Adam
Revelation Robotics
Title: Re: Revelation Robotics
Post by: RevRobots on February 17, 2017, 06:09:35 am
Leaving now, I'm very pumped.
Title: Re: Revelation Robotics
Post by: RevRobots on February 28, 2017, 10:00:39 am
Hey guys,

I just finished an event report on Motorama, Check it out here: https://revelationrobotics.wordpress.com/2017/02/28/event-report-motorama-2017/

Adam
Revelation Robotics
Title: Re: Revelation Robotics
Post by: Green machines on June 27, 2017, 11:47:43 am
Hey. The NERC Franklin registration is open on builders database. The sportsmans class still has some open spots left.
Title: Re: Revelation Robotics
Post by: RevRobots on July 09, 2017, 05:22:21 pm
Hey guys,

Wow, it's been a while since I've been on here.

Well, Sentinel is almost finished. here's a pic.

(http://buildersdb.com/botpics/11353.jpg)

The disks are AR400 cut on a water jet by a friend.

Concerns/Questions?

Adam
Revelation Robotics
Title: Re: Revelation Robotics
Post by: Infernaltank on July 09, 2017, 06:36:34 pm
http://sparc.tools/BotRank/detail.php?bn=U2VudGluZWwA&wc=3&ty=S

I may have told you previously, but I would suggest changing the name.
Title: Re: Revelation Robotics
Post by: RevRobots on July 09, 2017, 07:02:21 pm
Yes, I do remember, still trying to come up with a new name. Maybe Sentry, yeah I think I'll do Sentry.
Title: Re: Revelation Robotics
Post by: Badnik96 on July 10, 2017, 10:41:20 am
Those discs look nice! The wedgelets you have look prone to bending though, i assume you'd remove them if you face a horizontal spinner.

Any updates on "Bread"?
Title: Re: Revelation Robotics
Post by: RevRobots on July 10, 2017, 12:48:56 pm
Thanks, I designed them myself. I originally had a full wedge to combat horz. spinners, but weight became an issue. I also have extras.

Bread is coming along fine and pics will along shortly.

Adam
Revelation Robotics
Title: Re: Revelation Robotics
Post by: RevRobots on July 11, 2017, 02:38:50 pm
Hey guys,

I just got in from doing some weapons tests for Sentry and ran into a problem. The weapon will spin if I give it a boost, but without it, it starts then stops. My mind is drawing a blank but I think it has to do with the brushless.

Any thoughts?

Adam
Revelation Robotics
Title: Re: Revelation Robotics
Post by: RevRobots on July 11, 2017, 05:31:25 pm
Never mind guys I got it working, I will post some pics when I get a chance. Se you guys Saturday!

Adam
Revelation Robotics
Title: Re: Revelation Robotics
Post by: zacodonnell on July 13, 2017, 04:00:09 pm
If this problem is intermittent it could be a loose wire or bad solder joint between the motor and controller. I know you said you got it fixed but if it comes back that's what I would check.

Zac
Title: Re: Revelation Robotics
Post by: RevRobots on October 04, 2017, 03:07:17 pm
Hey guys,

I'm starting to build a Beetleweight horizontal spinner. The weapon will be pulley driven on a dead shaft. And I'm wondering how to mount the shaft to the chassis, and the weapon to the shaft without it sliding all over the place. How do you guys do it? I'm going to be milling the chassis out of (I think) UHMW.

Thanks,
Adam
Title: Re: Revelation Robotics
Post by: AmbientChaos on October 04, 2017, 06:50:48 pm
When I was trying to figure out how to set up the dead axle for my current antweight horizontal spinner (https://www.facebook.com/photo.php?fbid=10103838714167846&set=pcb.1994366287513868&type=3) I wound up looking at the pictures in Jamison Go's build log of DDT (http://thevariableconstant.blogspot.com/2017/02/ddt-onyx-one-filament-to-rule-them-all.html) for inspiration. Since I was trying to accomplish this with all off-the-shelf parts, here's a rundown of what I've wound up using:
Granted this was all completed just a few weeks ago and has yet to be tested in a competition, so your mileage may vary.
Title: Re: Revelation Robotics
Post by: zacodonnell on October 06, 2017, 03:13:28 pm
What you describe is very close to what I was going to recommend if using off the shelf parts. Hope to see it in action in person.

Zac
Title: Re: Revelation Robotics
Post by: RevRobots on February 15, 2018, 01:20:55 pm
Hey guys,

Wow, it's been a while since I've been on here, but I have a problem.
Whilst getting ready for Moto this year, the gremlins got to my Scorpion Mini ESC. The LED indicator light does not turn on, one of the chips gets very hot, and it gives no response. However, the BEC is working and the Rx works. All this makes me think that there is a short somewhere, but I have not found any. I swapped the ESC out for a spare that I had and it had the same problem, which makes me think that if there is a short, it's not in the ESC. Have any of you had this problem? I running a 11.1v Lipo, and 4 33.3 FingerTech motors.

Adam
Revelation Robotics
Title: Re: Revelation Robotics
Post by: RevRobots on February 15, 2018, 05:53:25 pm
Regarding the previous post, in case I don't get this fixed in time, would I be able to buy an ESC from someone? I running 4 33.3's on a 11.1v Lipo. I would appreciate it if someone could bring one for me.

Adam
Revelation Robotics
Title: Re: Revelation Robotics
Post by: zacodonnell on February 22, 2018, 08:26:38 pm
Adam, did you ever get this sorted out? If two different controllers had the issue then you're probably right - somethings up in the wiring harness.

-Zac
Title: Re: Revelation Robotics
Post by: RevRobots on June 27, 2018, 01:33:26 pm
Hey guys,

What Milling service would you guys recommend? The parts i need done cannot be done with water jet.

Thanks,
Adam
Revelation Robotics
Title: Re: Revelation Robotics
Post by: zacodonnell on July 17, 2018, 03:56:58 pm
Team whyachi is easy, but local shops work too if you call around. I use one in Huntington pa called Reihart machine.

Zac