SPARC Forum

Tech => Progress Reports => Topic started by: MikeNCR on January 14, 2015, 07:30:26 pm

Title: Near Chaos Robotics
Post by: MikeNCR on January 14, 2015, 07:30:26 pm
The Near Chaos Robotics fleet as of this posting consists of:

Nyx, a 30lb Sportsman class bot with interchangeable weapons including an axe, a crusher, and a lifter.

Spanky, a 30lb Sportsman class bot with interchangeable weapons including a chainsaw and a circular saw.

Dolos, the rebuilt carcass of Testbot, currently competing as a wedge with a floating bot catcher.

Hypnus, a 12lb dustpan-ish wedge.

Algos, a titanium clad antweight with a high rpm spinning drumette.

Klazo, one of the early prototypes for the 1lb Saifu kit that's undergone several upgrades over the years.

Reptar, an antweight front hinged flipper.

The team website is http://nearchaos.net/

We regularly post event and test videos to https://www.youtube.com/user/mikencr

More bots are almost always in the works. We'll also be running an event in May using the SPARC ruleset as part of the Atlanta Robot Fight Club.
Title: Re: Near Chaos Robotics
Post by: MikeNCR on January 18, 2015, 10:02:49 pm
With Motorama coming up and the Ratbots class theoretically happening I decided to make something.

This is: The End Result of a Series of Poor Decisions.

Cutting out the main body from 3" square tubing with the plasma cutter.
(http://i.imgur.com/tkAATtY.jpg)

Rough cut main body post plasma-ing.
(http://i.imgur.com/6cqIsZK.jpg)

Chassis after welding the main body to the cross bar and adding the "lipo jail" structure.
(http://i.imgur.com/BbiwnCr.jpg)

Rough mock-up with all wheels in place.
(http://i.imgur.com/9r4QksP.jpg)

First full power-on test. Everything works, even the weapon esc that already has one side burnt out.
(http://i.imgur.com/q1lilnO.jpg)

Components consist of:
1x Porter Cable 18v angle grinder
1x Chinese knock-off Magnum 775 gearmotor, originally a spare for Spanky.
1x 2650mAh 6s lipo, originally a spare for Nyx.
2x BR-XL esc's, originally spare weapon escs for Nyx.
1x R610 Orange RX, originally used in Moros iirc.

Weapon options consist of 1 wavy 21" lawnmower blade, one flat 21" lawnmower blade, and one 18" flat lawnmower blade. Waiting on arrival of the flat blades, some flame retardant foam for the battery, and the application of a large amount of duct tape.
Title: Re: Near Chaos Robotics
Post by: MikeNCR on January 20, 2015, 06:51:34 pm
This is the dumbest, ugliest, sketchiest thing I've ever made. But that was sorta the point.

(http://nearchaos.net/TERSPDone2.jpg)
Title: Re: Near Chaos Robotics
Post by: kuriosly on January 21, 2015, 03:08:39 am
Looks a little light. Isn't it suppose to be 12 lbs?
Title: Re: Near Chaos Robotics
Post by: Ellis on January 21, 2015, 07:23:48 am
Supposed to be visually-12lbs.
Title: Re: Near Chaos Robotics
Post by: MikeNCR on January 21, 2015, 08:58:38 pm
Did up a new set of rotors for the drumette upgrades Algos is getting.
Title: Re: Near Chaos Robotics
Post by: SamM on January 22, 2015, 11:39:54 am
Are they fully custom, or modified from existing rotors?
Title: Re: Near Chaos Robotics
Post by: MikeNCR on January 22, 2015, 12:09:29 pm
They're made from these outrunners- http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idproduct=35665

Stator area had the bearings pulled and the inner portion was drilled out to fit the 1/4" shoulder bolt shaft.
Title: Re: Near Chaos Robotics
Post by: zacodonnell on January 23, 2015, 09:29:09 pm
The patterned duct tape really sets off the crazy pattern on the blade.  This bot looks a lot like Mr. Self Destruct... but easier to contain. 

The whole RatBot thing is basically what I did for Weakened Warrior for Bot Blast a couple years back. I'd enter it in this except it's my multibot entry now.  Looks like you really nailed the spirit of it. It might be a very short-fought class but it will be fun to watch.

-Zac
Title: Re: Near Chaos Robotics
Post by: MikeNCR on January 31, 2015, 04:29:42 pm
https://www.youtube.com/watch?v=QRgEU1W9_Rw

Giving The End Result of a Series of Poor Decisions a quick shake down.
Title: Re: Near Chaos Robotics
Post by: MikeNCR on February 04, 2015, 11:11:30 pm
I've put Algos back together with the new, hopefully much more durable drumette.

(http://nearchaos.net/Algos2-4-2015-1280.jpg)

Here's a look at the weapon cross-section:

(http://nearchaos.net/DrumetteUpdate1-26-15.jpg)

1/4" dead shaft via a modified shoulder bolt.

Title: Re: Near Chaos Robotics
Post by: Harry Hills on February 05, 2015, 01:56:22 pm
Looks hella cool man.

What's the stuff covering the tires?
Title: Re: Near Chaos Robotics
Post by: MikeNCR on February 05, 2015, 01:59:06 pm
Looks hella cool man.

What's the stuff covering the tires?

Brush on latex.
Title: Re: Near Chaos Robotics
Post by: MikeNCR on February 05, 2015, 09:45:59 pm
It spins quite nicely after a few adjustments:

http://www.youtube.com/watch?v=O7Ye1KYO9fs
Title: Re: Near Chaos Robotics
Post by: MikeNCR on February 07, 2015, 06:10:44 pm
Here's a shot of the main parts of the spinning weapon on Algos.
Title: Re: Near Chaos Robotics
Post by: Lucas Grell on February 08, 2015, 12:23:24 am
Looks nice, I've been meaning to draw up something similar for a 15 pound bot for a while.
Title: Re: Near Chaos Robotics
Post by: MikeNCR on February 08, 2015, 10:35:57 pm
Took a couple clean shots of the ants pre-moto:

Algos:

(http://nearchaos.net/algos2015-1280.jpg)

Klazo:

(http://nearchaos.net/klazo2015-1280.jpg)

Eleos:

(http://nearchaos.net/eleos2015-1280.jpg)

The observant viewer will notice a new bot. Eleos is one of the new FingerTech Viper Lifter Kits. Not sure if it will be competing at Moto yet, but I'll have it for testing at a minimum.
Title: Re: Near Chaos Robotics
Post by: zacodonnell on February 09, 2015, 06:24:56 pm
How do you self right with Algos? just give the weapon some juice and it flips itself back over? It looks like the standoffs are too short to prevent the longest part of the blade from hitting.

-Zac
Title: Re: Near Chaos Robotics
Post by: MikeNCR on February 09, 2015, 07:46:11 pm
How do you self right with Algos? just give the weapon some juice and it flips itself back over? It looks like the standoffs are too short to prevent the longest part of the blade from hitting.

-Zac

Yeah, even if the weapon's stopped you can throw it in reverse to get the drumette starting to spin and it'll kick itself over pretty fast.

You can see it nicely in this video- http://youtu.be/X3lp1Pzcb6I?t=1m4s
Title: Re: Near Chaos Robotics
Post by: zacodonnell on February 09, 2015, 08:02:03 pm
This is how I was self righting Weakened Warrior until I changed the gearing to spin the blade faster for Chop. Now the motor and batteries can do it but the HK controller I had can't. I blew two up before I switched to the hoops of shame.  I may look for a more reliable controller for future versions if it doesn't get totally erased at Moto

-Zac
Title: Re: Near Chaos Robotics
Post by: MikeNCR on February 09, 2015, 08:03:44 pm
The drive wheels being in contact with the ground helps a lot, gets the motor past that initial startup lag.
Title: Re: Near Chaos Robotics
Post by: RevRobots on February 10, 2015, 04:16:09 pm
Hello,

What is on the tires of Eleos? They look very rubbery. I can't wait to see him. My little brother has a Viper spinner kit.

Adam
Revelation
Title: Re: Near Chaos Robotics
Post by: MikeNCR on February 10, 2015, 04:38:53 pm
They're the stock FT wheels with a brush on latex coating.
Title: Re: Near Chaos Robotics
Post by: Lucas Grell on February 10, 2015, 04:46:42 pm
Zac, what controller are you using in your bot? Must not have over-rated it by quite enough, or it's marked up because it's Chinese.
Title: Re: Near Chaos Robotics
Post by: MikeNCR on February 10, 2015, 10:06:47 pm
Here's the pre-Moto shot of Nyx:

(http://nearchaos.net/nyx2015-1280.jpg)
Title: Re: Near Chaos Robotics
Post by: Infernaltank on February 10, 2015, 10:11:26 pm
someone mentioned the fact that debris might clog your gear system on the axe and such. do you have a solution for that?
Title: Re: Near Chaos Robotics
Post by: Lucas Grell on February 10, 2015, 10:13:25 pm
I'd think it's pretty unlikely, and most debris that COULD block it would probably fall off if he reversed the weapon.
Title: Re: Near Chaos Robotics
Post by: MikeNCR on February 10, 2015, 10:20:24 pm
It's not a major concern as most of the gears in a spot where it might be an issue shouldn't touch the ground.
Title: Re: Near Chaos Robotics
Post by: zacodonnell on February 11, 2015, 06:46:45 pm
I'm using this controller:

http://www.hobbyking.com/hobbyking/store/__11743__HobbyKing_Brushless_Car_ESC_60A_w_Reverse.html

The blade is ~5" asymmetrical 20 tooth pulley on the motor and 34 tooth on the blade. I'm running 4S lipo now.  I think it may be an issue with the software sensing the overload in time to save itself.  I'm using it from a dead stop so I expected it to fail to start instead of blowing up, but I've got 2 dead ones now. One just stopped showing signs of life and the other smoked visibly.  They don't even get warm in normal usage. I did remove the fan.

-Zac
Title: Re: Near Chaos Robotics
Post by: Lucas Grell on February 11, 2015, 07:01:21 pm
If you do get new ESCs, I'd buy Tekin RS Gen 2s. I've been using the first-gen ones for 4 years now and I haven't lost a single one (well, I've LOST them, but that's a different story...). They weigh less than yours by far, are smaller, and should handle 120 amps on at least 4S lipo easy. I've driven some huge Neu motors off them and they don't even warm up, let alone die.
Title: Re: Near Chaos Robotics
Post by: zacodonnell on February 11, 2015, 07:16:37 pm
The specs on their site say they only go to 3S, or am I looking at a different controller than the one you mean?
http://www.teamtekin.com/rs.html

-Zac
Title: Re: Near Chaos Robotics
Post by: Lucas Grell on February 11, 2015, 07:23:59 pm
Nope, that's the ones. They say that, but they work fine on 4S, at least for ~15 minutes on the drive motors. I've run a weapon that drew around 120 amps startup on them and they survived, at 4s, I just avoided stalling if I could.
Title: Re: Near Chaos Robotics
Post by: zacodonnell on February 11, 2015, 07:29:15 pm
I think self-righting the robot using the weapon would qualify as stalling... and reliability would be the primary reason to switch so picking a controller that shows me out of spec is probably not the best bet. I spent a little more time on their site and found another controller that would fit in my footprint and should be way overkill (my favorite thing for ESCs) though:
http://www.teamtekin.com/rx8.html

It supports up to 6S, leaving lots of headroom. They say 200A but that's probably optimistic in practice but should still be way more than I need.

Thanks for putting me on to them. We'll see how it goes at Moto this year. I want to decide if this bot is going to be a real thing before dropping 200 bucks on a controller for it.

-Zac
Title: Re: Near Chaos Robotics
Post by: Lucas Grell on February 11, 2015, 10:00:43 pm
I meant like sitting there twitching, it stalls when it hits stuff of course. The RX8 is a nice controller, but for ALL of Tekin's ESCs, you should DEFINITELY either make a non conductive block with holes for those fancy golden pins, to prevent them being bent, OR snip the most of the way off and of course make sure you don't have any bridges between the pins before you hook it up to a battery.
Title: Re: Near Chaos Robotics
Post by: zacodonnell on February 12, 2015, 12:24:27 pm
I thought those connectors on this controller looked a little exposed. I try to "battle harden" all of my controllers by potting the leads in shoe goo and adding shrink wrap / electrical tape around all of the conductive areas. I've broken too many things trying to run wires and jam them in between components to trust the little solder joints to hold.  I may give that controller a shot - it's always good to hear from somebody who has used their stuff before in actual combat.

Bad things happen in robot fighting and arena debris is often conductive and sprayed all over the insides of the bots.  I did have a short to the baseplate in my sportsman last motorama where the heat melted through the insulation on the battery leads.  I have since improved both the insulation and wire gauge. 

-Zac
Title: Re: Near Chaos Robotics
Post by: Lucas Grell on February 12, 2015, 01:35:49 pm
Yeah, I always use overkill wire, it's definitely a good practice. We used the RX8s on GTO and G6 for a year, we retired the bots after that to work on new stuff. They worked great, they were just pretty bulky compared to the RSs.
Title: Re: Near Chaos Robotics
Post by: MikeNCR on February 12, 2015, 05:58:45 pm
Here's the pre-Moto shot of Spanky:

(http://nearchaos.net/spanky2015-1280.jpg)
Title: Re: Near Chaos Robotics
Post by: daggius on February 13, 2015, 08:42:20 pm
do the bearings embedded in a spinning weapon like algos has get worn out from impacts? 
Title: Re: Near Chaos Robotics
Post by: MikeNCR on February 13, 2015, 08:43:54 pm
do the bearings embedded in a spinning weapon like algos has get worn out from impacts?

We'll find out at Moto. The bearings are rated for a fairly high load so I'm hoping they'll last a while.
Title: Re: Near Chaos Robotics
Post by: daggius on February 13, 2015, 08:44:51 pm
do the bearings embedded in a spinning weapon like algos has get worn out from impacts?

We'll find out at Moto. The bearings are rated for a fairly high load so I'm hoping they'll last a while.

cool.  they are just 2 flanged bearings that you pressfit in there facing opposite directions?
Title: Re: Near Chaos Robotics
Post by: MikeNCR on February 13, 2015, 08:46:52 pm
do the bearings embedded in a spinning weapon like algos has get worn out from impacts?

We'll find out at Moto. The bearings are rated for a fairly high load so I'm hoping they'll last a while.

cool.  they are just 2 flanged bearings that you pressfit in there facing opposite directions?

Exactly, though it's a very slight press fit to avoid crushing the bearings. These are the specific bearings- http://www.mcmaster.com/#57155k305/=vwcijp
Title: Re: Near Chaos Robotics
Post by: Lucas Grell on February 13, 2015, 08:49:58 pm
Yeah, bearings in anything that takes impacts will be damaged, but most people have spares. Its just a matter of time before they're needed.
Title: Re: Near Chaos Robotics
Post by: Don Doerfler on February 14, 2015, 01:09:01 am
Bearings will work fine they work in my 15's
Title: Re: Near Chaos Robotics
Post by: IanMcMahon on March 01, 2015, 10:56:21 pm
How did the bearings hold up? I used the 1/2" OD version in the ants and they went crunchy after 3 matches. I used the non-flanged version of those in the beetles, and they went crunchy at 5 matches but are still spinning fine just noisy.
Title: Re: Near Chaos Robotics
Post by: MikeNCR on March 02, 2015, 08:22:39 am
How did the bearings hold up? I used the 1/2" OD version in the ants and they went crunchy after 3 matches. I used the non-flanged version of those in the beetles, and they went crunchy at 5 matches but are still spinning fine just noisy.

Pretty similar results to the beetles, a bit crunchy but still spinning well.
Title: Re: Near Chaos Robotics
Post by: MikeNCR on March 04, 2015, 09:35:47 pm
Spanky's due for a new weapon pod. Here's an animation of the concept:

(http://i.imgur.com/5PAUTEC.gif)

Should be right about at real speed.
Title: Re: Near Chaos Robotics
Post by: Koolaid64 on March 04, 2015, 09:39:16 pm
acme thread?
-Kyle
Title: Re: Near Chaos Robotics
Post by: MikeNCR on March 04, 2015, 09:41:38 pm
Yeah, 3/4" dia, 8 pitch.
Title: Re: Near Chaos Robotics
Post by: Koolaid64 on March 04, 2015, 09:42:52 pm
nice, that will be really strong. what are you cutting the jaw out of?
Title: Re: Near Chaos Robotics
Post by: MikeNCR on March 04, 2015, 09:46:00 pm
Blue-ish grey is 1/4" 7075, grey-grey is 1/4" AR400.
Title: Re: Near Chaos Robotics
Post by: Koolaid64 on March 04, 2015, 09:54:00 pm
The ar is really stiff but I would worry about horizontal stress. I know Charles bent his front lifter supports on clocker in the wrestling match agents Nyx. Are you going to lock them together with standoffs?
Title: Re: Near Chaos Robotics
Post by: MikeNCR on March 04, 2015, 10:03:13 pm
Probably won't. The forks on Nyx are also 1/4" AR400 and held up great at Moto.
Title: Re: Near Chaos Robotics
Post by: Koolaid64 on March 04, 2015, 10:07:14 pm
good deal then. I look forward to it.
-Kyle
Title: Re: Near Chaos Robotics
Post by: jamisong on March 05, 2015, 03:00:41 am
Uberclocker doesnt have any AR on it anywhere tho. And this year it was actually the fasteners that failed out.
Title: Re: Near Chaos Robotics
Post by: Koolaid64 on March 05, 2015, 08:16:52 am
ah ok. I didn't get to look close at it, just saw that one went way sideways
Title: Re: Near Chaos Robotics
Post by: zacodonnell on March 05, 2015, 05:54:13 pm
It's very Diesector.

It's going to be very fun to drive

-Zac
Title: Re: Near Chaos Robotics
Post by: MikeNCR on March 14, 2015, 10:45:49 pm
Trying to get into the habit of posting to Nearchaos.net more regularly. I'm intending to put up a post on a robot combat related topic every other weekend for the foreseeable future.

Here's the first one:

http://nearchaos.net/unrequested-advice-drive-better/
Title: Re: Near Chaos Robotics
Post by: Lucas Grell on March 15, 2015, 12:36:31 am
I like the article; building well is important, but you can have the best robot in the world and you can still lose if you can't drive well.
I've spent a lot of time driving, albeit mostly unenclosed, but I try to set some sort of boundary. Like, when I don't have a weapon/spin it up, I just drive in this hallway intersection at our school. It's a little smaller than the arena I fight in, so I think it probably offers better practice. However, one thing that's nice is to practice on the same type of floor as you'll be fighting on. For example, bots really, really suck on waxed linoleum like at our school. If you fight on steel, practice at least some on steel, even if it's much thinner than what you fight on. It'll still grip about the same, and that can show you some issues you didn't think you had. For example, one of my bots had severe gyroing issues. It wasn't as bad in the test box as it was in the arena, so I had to practice not flipping myself every time I tried to turn...
Title: Re: Near Chaos Robotics
Post by: zacodonnell on March 15, 2015, 11:06:57 am
Trying to get into the habit of posting to Nearchaos.net more regularly. I'm intending to put up a post on a robot combat related topic every other weekend for the foreseeable future.

Here's the first one:

http://nearchaos.net/unrequested-advice-drive-better/

I like the article too.  In my experience, my driving skills are pretty weak, so I have to make it so my bot doesn't go that fast to avoid over-steering. More practice would be good, but with the weapon being a very large part of how the bot handles for my machines it's tough to get real driving practice in a safe way.

If you're looking for article topics, doing one on making a wiring harness that doesn't fail would be a big deal for a lot of new teams. Things like isolating all of the contacts, tying wires down so they can't pull loose, keeping rx wires plugged in, power switches, etc are all very common failures I see with new bots.  I tried a long time ago to write a little blurb about how to troubleshoot bots but I wasn't able to make the flow of the document work because there were too many possibilities. Maybe you could do a better job of staying focused :)

-Zac
Title: Re: Near Chaos Robotics
Post by: MikeNCR on March 15, 2015, 04:12:19 pm
Thanks, I figure the postings will be a mix of tips/advice, progress report-ish things, and general commentary.
Title: Re: Near Chaos Robotics
Post by: MikeNCR on March 27, 2015, 09:20:48 pm
This weekend's post is a bit short on raw text, but it's got the power point portion of a presentation I'll be giving at Freeside Atlanta included with it-

http://nearchaos.net/combat-robot-building-micro-bots/
Title: Re: Near Chaos Robotics
Post by: zacodonnell on April 07, 2015, 08:22:17 pm
I think some people might have trouble with the .rar format for that archive.  Would it be possible for you to post a zip format version too since that is handled natively by windows?

-Zac
Title: Re: Near Chaos Robotics
Post by: MikeNCR on April 07, 2015, 09:10:00 pm
I think some people might have trouble with the .rar format for that archive.  Would it be possible for you to post a zip format version too since that is handled natively by windows?

-Zac

Done.

Upcoming topics in no particular order:
Wiring Harnesses/Internal Battle Hardening
Wheels and Wheel Protection
Chaos Cube Repairs and Upgrades

If anyone has topics they'd like me to cover, feel free to post them or email me.
Title: Re: Near Chaos Robotics
Post by: zacodonnell on April 07, 2015, 09:27:54 pm
I think a lot of new teams could use a tutorial on battle-hardening the internals of a bot. Specifically hot glue / tape for rx leads, loctite on screws, foam around batteries, wire ties for loose wires, keeping things away from moving parts, etc.

I saw quite a few of these being missed by the rookie teams this weekend, and I know I never thought about them for my first bot.

-Zac
Title: Re: Near Chaos Robotics
Post by: MikeNCR on April 07, 2015, 09:32:37 pm
Good idea, I think I'll blend that in with the wiring harnesses, as it's all pretty tied together.
Title: Re: Near Chaos Robotics
Post by: zacodonnell on April 07, 2015, 09:37:49 pm
Definitely. I think the #1 type of failure for rookie bots is electrical unplug or accidental short when something comes loose or gets sucked into a sprocket or wheel. That's probably followed closely by "set screw worked loose" failures.  Actual mechanical damage is less common, partially because it can only happen if a working weapon is also involved between the two bots.

-Zac
Title: Re: Near Chaos Robotics
Post by: Infernaltank on April 07, 2015, 09:47:56 pm
I look forward for the future installments.
Title: Re: Near Chaos Robotics
Post by: FingerTech on April 12, 2015, 04:16:18 pm
Please stress the use of loctite.  The number one failure I've seen is screws and setscrews coming loose.  I've got it in all my instruction manuals but new builders still think it's unnecessary.
Title: Re: Near Chaos Robotics
Post by: MikeNCR on April 12, 2015, 04:31:54 pm
On that note, here's the post:

Battle Hardening the Inside of Your Bot
http://nearchaos.net/battle-hardening-the-inside-of-your-bot/ (http://nearchaos.net/battle-hardening-the-inside-of-your-bot/)
Title: Re: Near Chaos Robotics
Post by: zacodonnell on April 13, 2015, 06:58:18 pm
Excellent.  I will be sending this link to any new builders I talk to. Just the connectors, tape, zipties, and loctite sections would make SO MANY more fights go the distance.  I had several different people ask my how I made my shell spinner "so reliable" and pretty much everything I did is in this post. 

The only other thing is that I try to not push the parts to the breaking point in normal use because when stuff gets bent / something is a bit crunchy the parts all have to work a lot harder. This is much harder to quantify in the design stage and probably is beyond the scope of your series. I guess I have to also say that my bot broke more this year than any time in the past 2 years so maybe I'm losing my touch :).

I've never used acid flux before. What do you find that it helps the most with?

-Zac
Title: Re: Near Chaos Robotics
Post by: MikeNCR on April 13, 2015, 07:18:55 pm
I've never used acid flux before. What do you find that it helps the most with?

It's fantastic for the initial tinning of the wires. Really helps with the solder flow. Most of my connections have solder pretty well permeated throughout the first little nub of wire.
Title: Re: Near Chaos Robotics
Post by: zacodonnell on April 13, 2015, 07:44:10 pm
When you do ring/spade terminals do you put solder on them too, or just trust the crimp?  I try to solder all my connections and have never met a crimp I trusted on its own but of course the crimp is probably mechanically stronger.

I have always been overspec on my wire gauge too. I could probably get a lot of weight back in my bots by downsizing the wiring. I basically use 14 ga for the drive motors in my 12/30 pound bots, and 12 ga for anything in the weapon or power system.  In my 6 pounder I use 18 ga for everything. I have had to retrofit the drive controller on the 30 with the same 18ga wire at a competition before and it has been holding up since then, so I'm sure I'm way overkill with 14 ga.

What sizes do you use in those ranges? 

-Zac
Title: Re: Near Chaos Robotics
Post by: MikeNCR on April 13, 2015, 07:49:51 pm
When you do ring/spade terminals do you put solder on them too, or just trust the crimp?  I try to solder all my connections and have never met a crimp I trusted on its own but of course the crimp is probably mechanically stronger.

I have always been overspec on my wire gauge too. I could probably get a lot of weight back in my bots by downsizing the wiring. I basically use 14 ga for the drive motors in my 12/30 pound bots, and 12 ga for anything in the weapon or power system.  In my 6 pounder I use 18 ga for everything. I have had to retrofit the drive controller on the 30 with the same 18ga wire at a competition before and it has been holding up since then, so I'm sure I'm way overkill with 14 ga.

What sizes do you use in those ranges? 

-Zac

I tend to crimp then solder for most connections. Not really necessary, but a bit of extra security for no real weight gain.

As far as wire goes, for the most part I use Deans 16ga in the 30's. The ants are mostly whatever came stock on the motors/escs/battery/etc
Title: Re: Near Chaos Robotics
Post by: Lucas Grell on April 13, 2015, 07:58:38 pm
I've been using 12 and 10 gauge wire in my bots, and I need it, too ;)
When I was using powerpoles, I crimped and soldered, it's definitely worth it. Crimps tend to pull apart eventually, but the solder holds it all in once piece so it can't slide out.
Title: Re: Near Chaos Robotics
Post by: MikeNCR on April 27, 2015, 12:41:47 am
It's a bit later in the evening than I'd have liked to finish this up, but that's what happens when you spend the weekend working on a bunch of small projects-

Bringing an Arena Out of Retirement
http://nearchaos.net/bringing-an-arena-out-of-retirement/ (http://nearchaos.net/bringing-an-arena-out-of-retirement/)
Title: Re: Near Chaos Robotics
Post by: MikeNCR on April 28, 2015, 08:03:38 pm
Thinking one of the next posts is going to be on where to get harder to find/pricier materials at the best prices (ie, 7075 alu, AR400, tool steels, magnesium, etc...)

Thoughts?
Title: Re: Near Chaos Robotics
Post by: Infernaltank on April 28, 2015, 08:23:57 pm
I think that would be a good post idea.
Title: Re: Near Chaos Robotics
Post by: BranYoung on April 28, 2015, 08:43:41 pm
I agree. It would help if I knew where to go to get materials for my robots like if I wanted to build a hobby, feather....or a heavy for Battlebots in 10 years...
Title: Re: Near Chaos Robotics
Post by: Lucas Grell on April 28, 2015, 09:55:24 pm
Definitely a good plan. Maybe a post with a quick guide to some common metals and their uses as well?
Title: Re: Near Chaos Robotics
Post by: zacodonnell on April 28, 2015, 10:03:36 pm
I agree that a "where to get them" would be way more useful if you also discussed assets and liabilities of materials that are frequently used.  Otherwise it is unlikely that new builders would understand why knowing where to get 7075/grade 5 ti/AR400 is important

-Zac
Title: Re: Near Chaos Robotics
Post by: MikeNCR on April 28, 2015, 10:06:52 pm
I agree that a "where to get them" would be way more useful if you also discussed assets and liabilities of materials that are frequently used.  Otherwise it is unlikely that new builders would understand why knowing where to get 7075/grade 5 ti/AR400 is important

-Zac

That'll be part of the discussion. (After all, a wall of links is a bit dull)
Title: Re: Near Chaos Robotics
Post by: MikeNCR on May 02, 2015, 09:04:38 pm
Did a bit of antweight work today.

First up is the replacement for the derpy thwackbot with the massive wheels, here's Gelos v2:

(http://nearchaos.net/GelosV2Complete.jpg)

Key Specs:
11.1:1 Silver Sparks
3s Lipo
1.25" wheels
3/32" hardened 4130 wedge
3D printed ABS chassis

Speaking of the printed chassis, here's what it looked like fresh off the printer:

(http://nearchaos.net/GelosPrinted.jpg)

In addition to that, I did a bit of work on Eleos:

(http://nearchaos.net/EleosUpgraded.jpg)

Gave it some fresh 2.25" wheels and upgraded the electrical system. It's now running on a 3s Lipo and uses a 9v regulator from Fingertech to power the servo.
Title: Re: Near Chaos Robotics
Post by: MikeNCR on May 25, 2015, 11:19:45 pm
This weeks post is up. This time around I'm rambling on a bit about wheel guards:

http://nearchaos.net/wheel-guards-maximum-exposure/
Title: Re: Near Chaos Robotics
Post by: MikeNCR on June 21, 2015, 12:39:00 am
Spanky got a new weapon:

https://www.youtube.com/watch?v=kTLujqWzp5Q
Title: Re: Near Chaos Robotics
Post by: RevRobots on June 21, 2015, 04:07:14 pm
Sweet,
What powers the grabber?

Adam
Revelation Robotics
Title: Re: Near Chaos Robotics
Post by: MikeNCR on June 21, 2015, 04:26:34 pm
Sweet,
What powers the grabber?

Adam
Revelation Robotics
There's a Magnum775 hidden under the whole assembly.
Title: Re: Near Chaos Robotics
Post by: MikeNCR on June 29, 2015, 10:05:51 pm
Figured a picture of the bot with something for scale, say Nyx, would help put the absurdity of the new weapon into context.
Title: Re: Near Chaos Robotics
Post by: zacodonnell on June 30, 2015, 12:49:31 pm
Crikey those are some big jaws. Kinda looks like "Lock Jaw"... you know the one I mean :D

-Zac
Title: Re: Near Chaos Robotics
Post by: MikeNCR on June 30, 2015, 12:53:19 pm
Crikey those are some big jaws. Kinda looks like "Lock Jaw"... you know the one I mean :D

-Zac

Are you talking about Lock-Jaw or Lock-Jaw?  :P
Title: Re: Near Chaos Robotics
Post by: zacodonnell on June 30, 2015, 01:30:30 pm
Definitely Lock-Jaw

-Zac
Title: Re: Near Chaos Robotics
Post by: Badnik96 on June 30, 2015, 02:20:28 pm
It's like a fusion of both Lock-Jaws actually. Almost like they...

locked jaws...
Title: Re: Near Chaos Robotics
Post by: MikeNCR on June 30, 2015, 02:57:15 pm
It's like a fusion of both Lock-Jaws actually. Almost like they...

locked jaws...

+5 imaginary points.
Title: Re: Near Chaos Robotics
Post by: MikeNCR on July 01, 2015, 10:43:06 pm
Made a chew toy for Triggo. Meet Styx, the robot formerly known as Nyx.
Title: Re: Near Chaos Robotics
Post by: zacodonnell on July 04, 2015, 08:46:03 pm
I love the paint but I have a feeling Triggo isn't going to love eating that wedge for a whole three minutes.  Well, the wedge and the wall I guess..

Last time I fought Nyx with one of my bots you owned me so bad I should have just put the transmitter down.

-Zac
Title: Re: Near Chaos Robotics
Post by: Jeff Gier on July 20, 2015, 06:12:03 pm
Hey Mike,

Did you use a 3 jaw chuck on the lathe when cutting down the magnet ring in Algos?  I'm trying to do a similar thing and I'm pretty worried about warping the ring. 
Title: Re: Near Chaos Robotics
Post by: MikeNCR on July 20, 2015, 06:18:57 pm
Hey Mike,

Did you use a 3 jaw chuck on the lathe when cutting down the magnet ring in Algos?  I'm trying to do a similar thing and I'm pretty worried about warping the ring.

Yeah, used a 3 jaw on a small sherline tabletop lathe. I clamped it as lightly as I could while keeping it from moving and did slow/shallow cuts to minimize force.
Title: Re: Near Chaos Robotics
Post by: Infernaltank on July 20, 2015, 06:23:32 pm
I assume Styx is a reference to this?

http://www.youtube.com/watch?v=CzzZkkiJMv8
Title: Re: Near Chaos Robotics
Post by: MikeNCR on July 20, 2015, 06:50:35 pm
I assume Styx is a reference to this?

http://www.youtube.com/watch?v=CzzZkkiJMv8

More this- https://en.wikipedia.org/wiki/Styx
Title: Re: Near Chaos Robotics
Post by: MikeNCR on August 30, 2015, 07:12:31 pm
Reptar Version 3 is mechanically done. It's 6-7g overweight, though I suspect I can get a good bit of that out with some aggressive wedge shaving. Wedge was made longer than needed intentionally to give some wiggle room here.
Title: Re: Near Chaos Robotics
Post by: zacodonnell on August 30, 2015, 07:20:03 pm
did you get a fancy photo booth like Pete Smith too?

-Zac
Title: Re: Near Chaos Robotics
Post by: MikeNCR on August 30, 2015, 07:33:52 pm
did you get a fancy photo booth like Pete Smith too?

-Zac

It's technically Julie's, but it works well for small bots.
Title: Re: Near Chaos Robotics
Post by: MikeNCR on September 27, 2015, 01:09:14 pm
Those that have met Joe at Motorama are probably not going to be surprised that he decided that he wants a bot of his own. We've been plotting, planning, and CADing off and on for a good while now and the design is just about done.

Morrigan
Dragon Con/Sportsman 30lb bot
Drive: 2x DeWuts on 6s in low gear with 6" Chaos Hubbed Colsons
ESC: Prototype RageBridge v2 for drive, BR-XL for weapon
Weapon Motor: Magnum 775
Weapon(s): 10" diameter chain flail, 6" diameter AR400 thresher, 400rpm. Removable rear ramming spike/wheelie bar.
Title: Re: Near Chaos Robotics
Post by: MikeNCR on October 31, 2015, 05:35:08 pm
General Update:

Nyx-
Lifter needs a little bit of work. The wires got mangled at Dragon Con so they'll get replaced. I also want to take a look at the final reduction stage and see how the new shaft material's holding up.

Spanky-
Pretty much ready to go.

Morrigan-
All the parts for Joe's new Sportsman bot are either on hand or on order including some 3/16" laser cut AR400 for the impactors. The chassis still needs to be waterjetted but once that's done the rest of the fabrication should go quickly.

Styx-
The busted drive chain at Dragon Con has been replaced and I've pulled the rubber wedge travel stops so it'll now drag on the ground. Nothing left to do but charge/pack.

Algos-
Wedge has been sharpened and a fresh drumette has been installed.

Klazo-
No real damage at Dragon Con, so it's ready for another go. May give the wedgelets a quick sharpening if they look dull.

Bia-
New esc has been installed and the bot's back together. Should be making its combat debut at Motorama.


Upcoming events:
Robot Battles 57 at Joystick Gamebar on December 5th. Algos, Klazo, Reptar, and Gelos will all be running in the 1lb class.
Battle at Jekyll Con- May be attending with some of the 1lb bots.
Robot Battles 58 at Chattacon- Attending with some portion of the 1lb fleet, at least Algos and Klazo.
Motorama- Planning to bring Bia, Algos, Klazo, Styx, Nyx, Spanky, and Morrigan. With 4 30lb bots it'll be a long weekend.
Title: Re: Near Chaos Robotics
Post by: MikeNCR on December 07, 2015, 08:49:00 am
Morrigan's done. Proper build report coming soonish-

https://www.youtube.com/watch?v=56cGUIUh8T4
Title: Re: Near Chaos Robotics
Post by: MikeNCR on February 28, 2016, 07:29:15 pm
After around 3.5 years it's time to retire Algos. During that time it has managed a 61-12 record in singles competition and racked up quite a few podium finishes:

1st Place
Motorama 2016
Robot Battles 58 at ChattaCon
Robot Battles 57 at Joystick Gamebar
Dragon Con Robot Micro Battles 2015
Clash of the Bots 2015
Freeside Robot Street Fight 2015
Motorama 2015
Dragon Con Robot Micro Battles 2013
Clash of the Bots 4
AMMF Presents Atlanta Robotic Combat 2012

2nd Place
Dragon Con Robot Micro Battles 2014
Clash of the Bots 2014
Motorama 2014

3rd Place
Motorama 2013

As part of retiring Algos, we're releasing the final CAD version of the bot. There's been a bit of manual finishing and adjustment from the models but this would be enough to get you most of the way there.

Full CAD can be downloaded at: http://nearchaos.net/AlgosFinal.rar
Title: Re: Near Chaos Robotics
Post by: frank26080115 on February 29, 2016, 01:27:35 am
in that last picture of Algos, where a screw seems to have ripped out of the titanium plate, what happened? The direction seems odd, was the screw itself hit?

man I am not understanding how you built that thing under a pound, or I suck at my first design lol. My wide drum weapon is 150 grams vs your narrow 75 grams, and my battery is a 2S 800mAH vs your 3S 325mAH. Did I make poor decisions?

thanks for the CAD files, very educational.
Title: Re: Near Chaos Robotics
Post by: MikeNCR on February 29, 2016, 07:27:42 am
in that last picture of Algos, where a screw seems to have ripped out of the titanium plate, what happened? The direction seems odd, was the screw itself hit?

man I am not understanding how you built that thing under a pound, or I suck at my first design lol. My wide drum weapon is 150 grams vs your narrow 75 grams, and my battery is a 2S 800mAH vs your 3S 325mAH. Did I make poor decisions?

thanks for the CAD files, very educational.

The hit that bent the plate oddly was against DDT at Moto. What's odd is the screw seemed undamaged and threaded out just fine. Haven't gone back and figured out exactly what happened there yet. As far as weight goes, it's all a balancing act. With the parts I'm running in Algos I could run even less than 325mAh, but I'd have trouble sourcing the burst current for spin-up, so I've chosen the smallest pack that was capable of providing the power needed.
Title: Re: Near Chaos Robotics
Post by: RevRobots on February 29, 2016, 04:26:13 pm
Wow Algos is retiring. What will you replace him with?

Adam
Revelation Robotics
Title: Re: Near Chaos Robotics
Post by: MikeNCR on February 29, 2016, 07:53:03 pm
Wow Algos is retiring. What will you replace him with?

Adam
Revelation Robotics

Got a few 3lb bot ideas kicking around.
Title: Re: Near Chaos Robotics
Post by: BranYoung on March 01, 2016, 09:32:54 am
Hey Mike, any particular reason why you took ball bearings over bushings? At the very least, would bushing of similar ID work fine as a substitute?
Title: Re: Near Chaos Robotics
Post by: MikeNCR on March 01, 2016, 12:09:57 pm
Hey Mike, any particular reason why you took ball bearings over bushings? At the very least, would bushing of similar ID work fine as a substitute?

Bushings would be workable but you'd need to stay on top of the wear to ensure that the magnets don't start rubbing on the stator. Even with the bearings the stator took a beating, worn bushings would do the same or worse.
Title: Re: Near Chaos Robotics
Post by: MikeNCR on March 02, 2016, 09:53:42 pm
Near Chaos Robotics will be part of the Chaos Corps for Season 2 of BattleBots-

https://www.facebook.com/ChaosCorps/
Title: Re: Near Chaos Robotics
Post by: daggius on March 03, 2016, 02:48:41 pm
Near Chaos Robotics will be part of the Chaos Corps for Season 2 of BattleBots-

https://www.facebook.com/ChaosCorps/

congrats!

algos is a pretty amazing bot.  did anyone ever chew up or rip off a wheel?  it seems like the only weakness of algos, and you drive well enough that it is never exposed
Title: Re: Near Chaos Robotics
Post by: MikeNCR on March 03, 2016, 03:31:29 pm
Near Chaos Robotics will be part of the Chaos Corps for Season 2 of BattleBots-

https://www.facebook.com/ChaosCorps/

congrats!

algos is a pretty amazing bot.  did anyone ever chew up or rip off a wheel?  it seems like the only weakness of algos, and you drive well enough that it is never exposed

It has lost a few wheels over the years. That's the trade off between manuverability/weight and protection
Title: Re: Near Chaos Robotics
Post by: RevRobots on March 03, 2016, 06:56:00 pm
Congrats Mike! NERCers unite!

Adam
Revelation Robotics
Title: Re: Near Chaos Robotics
Post by: Evil Steve on March 04, 2016, 05:43:24 am
That is one seriously bad-ass axe! I can't wait to see it in action.