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Messages - Jeff Gier

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16
Progress Reports / Re: Team Mechanical Advantage
« on: September 14, 2015, 11:40:38 am »
I know I'm extremely late to the party but how/where did you get hold of and fit the 17:1 gearboxes? I have entirely too many of the 13mm maxons lying around but I can't find the 17:1 boxes in any flavour other than 'ridiculously expensive' :(

I bought these:
 http://www.ebay.com/itm/DC-12V-235RPM-Maxon-DC-Motor-Coreless-Servo-Motor-Gear-Motor-139885-/181650622123?hash=item2a4b3886ab

And then turned off approximately one carrier length from the ring gears.  It was a process to get it right and I had a medium success rate in converting.  In a few weeks, I will get to combat test them.   If it goes well I plan to make a write up on it. 

17
Progress Reports / Re: Team Mechanical Advantage
« on: September 12, 2015, 11:41:28 am »
Made a big mess working on bots today.


18
Progress Reports / Re: Revelation Robotics
« 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.

19
Progress Reports / Re: Team Mechanical Advantage
« on: September 08, 2015, 12:06:05 am »
A bit of time in the shop today. More to come hopefully!



edit: Fixed the pic

20
Progress Reports / Re: First Beetleweight
« on: September 01, 2015, 09:35:00 pm »
Aluminum axles could definitely work, it just depends on what you want it to do.  At that thickness, I would expect them to get really bent against a spinner.  I would go with a bolt and cotter pin, or case hardened steel shaft and pin. 
 

21
Progress Reports / Re: Team Magical Papershredder
« on: August 19, 2015, 06:32:52 pm »
wish us luck!

Ok. Good luck!

What is your location?

22
Progress Reports / Re: Team Mechanical Advantage
« on: August 18, 2015, 12:09:30 pm »
I got it all together with a mockup wedge and back plate made of thin PC instead of titanium.  Here is a video of driving and some light gyro-dancing: https://www.youtube.com/watch?v=j02FFwhRrc0

I've had some durability issues with the drum teeth and have some plans to make a new version, but nothing concrete yet.  I hope to get the wheel guards together this week and verify weight before I move further on drum changes. 

23
Progress Reports / Re: Revelation Robotics
« 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!

24
Progress Reports / Re: Team Mechanical Advantage
« on: August 10, 2015, 10:51:14 am »
That spin up does inspire awe.   :D  Are you planning on bringing this to the Loveland Maker Faire?

Pete - Team Cosmos

I'm on track to have it finished in time!

25
Progress Reports / Re: Team Mechanical Advantage
« on: August 10, 2015, 12:05:44 am »
New side plates for the weapon and the drive!  Clamping mounts for "battle-hardened" maxons.  1/4" 7075 dead axle used like a standoff to create a very rigid system.




Here is a video of the first spin up.  It's hella loud and spins down much slower than the previous version.  Can't wait to see it hit something.

https://www.youtube.com/watch?v=cUa5neEUO6A

26
I am also having trouble visualizing this.  Can you post a picture of the bot, or a sketch?

27
Questions / Re: Help with a stubborn pinon
« on: August 07, 2015, 10:41:37 am »
Hello,  I've had to remove countless gears from 550 sized motors.  Each one is a bit different, but here are a few tactics I have used.

1. Heat the pinion with a torch. A small one handed torch is fine, but it needs to be hotter than a heat gun and more fuel consumption than a lighter.

2. Sometimes there is some kind of knurl or nub on the end of the motor shaft that makes taking the pinion off pretty much impossible.  Grind down the end of the shaft a bit shorter until you get to the pinion.  Then it may slip off with a pull or with heat

3.  I have made plates out of 16 gauge steel that have a U cut out of them.  Slide the shaft into the U so that the pinion is supported by the plate.  Support the plate in a vise.  Take a hammer and a pin and try and tap it out.  Works best if you try 1 and 2 first. 

But before you proceed, you may want to weigh some of the components you plan to use.  Drill motors are very large to be used in a 3 pound bot. 

28
Questions / Re: Looking for powerful beetleweight motors
« on: August 05, 2015, 09:52:49 pm »
The Bot Bitz 10 amp controller does have a BEC.

29
Progress Reports / Re: Viper Vertical Spinner - Antweight
« on: August 05, 2015, 12:47:43 pm »
Jeff I usually attach the images to my post. But I'll start linking them as well.

Sorry about that, I completely skipped over the attached images (doh!).  It looks great!

30
Progress Reports / Re: Viper Vertical Spinner - Antweight
« on: August 05, 2015, 11:01:10 am »
Also if the pulley is bolted to the disk. Would it be best to have 3 bearings? One on each side of the disk and another on the edge of the pulley?
Or just one on each side of the disk and then the pulley not have a bearing. Both those options seem better than what I have modeled currently.

As a general rule, I do not put 3 bearings on the same shaft.  In some situations, 3 or more bearings are required and this needs some special engineering to make work.  This is not one of those situations.  Where you put the bearing and attach the pulley is up to you, just limit it to 2 bearings total. 

As usual, a picture is worth so much more than just a paragraph.  Don't hesitate to post pics.  I use Google photos to upload my pics.   

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