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#1
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Re: AndyMark Parts Feedback 2015
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.
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#2
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Re: AndyMark Parts Feedback 2015
As an LRI, I came across several teams that were getting hot motors and/or voltage drop outs. A common issue I saw was:
Kit bot modified to 6" wheels with no other mods. The effective free speed for this arrangement is quite high (something on the order of 20 FPS). This lead to a lot of hot motors. I also helped a few teams that had placed a gear backwards in the gearboxes. There is a small offset that helps keep the gears from dragging on the housing. this drag resulted in hot motors as well. It might be good to add a current check on blocks for a chassis to see if you have un-necessary drag. this can be done with the PDP board and your laptop. Might be good to add a diagnostic tool. |
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#3
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Re: AndyMark Parts Feedback 2015
Quote:
Quote:
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#4
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Re: AndyMark Parts Feedback 2015
We didn't use many AM parts this year, but we watched many teams running the stock kitbot beach themselves on the bump.
In prior years (2010 & 2012), there was been some kind of modification to allow for traversing, or at least not getting stuck on obstacles. I believe this should be an important requirement for designing future kitbots. |
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#5
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Re: AndyMark Parts Feedback 2015
1983 used the LJ Bevel Boxes in our drivetrain this year. There were a few quality issues with the bearing bores not being straight/lined up across the box and with some flashing left in a few of the bevel gear teeth that we had to file out. We bought 9 (2 robots + spare), and only 8 were really usable. We put the 4 best on the comp bot and the others on the practice robot. There was a noticeable difference in robot speed and battery draw, but ultimately they ran fine all season on both robots.
I would love to see these with a 1/2" hex output, since 3/8" hex COTS parts don't have the same available selection as 1/2" hex does. From what I recall, that was the only AndyMark product we used on our robot this year. We had plans to run modified supershifters and all kinds of fun things, but then Recycle Rush happened. Quote:
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#6
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Re: AndyMark Parts Feedback 2015
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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#7
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Re: AndyMark Parts Feedback 2015
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#8
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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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#9
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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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#10
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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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#11
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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. Last edited by Oblarg : 28-04-2015 at 23:29. |
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