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Unread 28-04-2015, 14:30
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Re: AndyMark Parts Feedback 2015

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Originally Posted by marshall View Post
We broke two of those as well. They are good gearboxes provided you capture the output shaft solidly. Overhung loads on those gearboxes cause problems though.
We didn't support our shaft this year. It was running two different chain loads. I will keep that in mind for next year.
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Unread 28-04-2015, 14:31
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Re: AndyMark Parts Feedback 2015

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Originally Posted by wilsonmw04 View Post
We didn't support our shaft this year. It was running two different chain loads. I will keep that in mind for next year.
Well, we were trying to drive a 7 foot arm with 20 pounds of dynamic load on the end of it... so, yeah... YMMV.
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Unread 28-04-2015, 14:43
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Re: AndyMark Parts Feedback 2015

We tried both the AM mecanum wheels and the Vex models. We used the 6" standard AM's on a demo bot without incident for 40+ hours before breaking a roller axle. We decided to go with the AM HD wheels for our comp bot and were very happy. Smooth and very strong and durable. We are planning to make hubcaps for them for Cow Town; they look like they deserve something pretty.
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Unread 28-04-2015, 15:20
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Re: AndyMark Parts Feedback 2015

341 used originally used the Banebots 220 series gearbox and they seemed very good to get an initial idea of reductions, especially with the add on 4:1 reduction. Since then, we changed to a SuperShifter for our elevator and have had no complaints since. We locked it into high gear, but the shifting was smooth when we were playing with it. The best part of the SuperShifter was the ability to set it and forget it. We never had to open it up to service it, and once the encoder was set it worked for the rest of the season.
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Unread 28-04-2015, 23:02
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Re: AndyMark Parts Feedback 2015

We used the gears form the kit of parts drive train, my only comment would be, can they please be made of aluminum next year?
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Unread 28-04-2015, 23:14
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Re: AndyMark Parts Feedback 2015

The worm in the WormBox consists of a plastic worm on a metal bushing. The connection between these two is not as strong as it should be (it appears to be a rather weak interference fit), and so under load the plastic can slide on the bushing and get pushed into the CIM mounting hole, causing lots of friction and eventual failure.

We discovered this before it became unmanageable and, with the help of the NASA machine shop, were able to push the bushings back into place and secure them there with pins. Such pins should be standard to prevent this from happening in the first place. Other than that, they were surprisingly durable for plastic gearboxes and the encoder mounts were very handy. Would purchase again, provided this problem is fixed.

We also received a hex hub that wasn't bored anywhere close to straight, and was unusable. We seem to encounter little QC problems like this every year, and while they're not crippling they are a constant annoyance.
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Last edited by Oblarg : 28-04-2015 at 23:29.
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