Quote:
Originally Posted by sciencenerd
Hey, I'm Kyle Corbitt from team 1318. We're the people who broke our gearbox.
First off, many thanks to Madison and all of you for helping out! We had hoped that someone would have these available, but I am simply overwhelmed by the level of support we're getting from the FIRST community.
The gearbox broke late Monday night, about an hour before we had to ship the robot. In our brief postmortem we discovered that the final stage, as logic would indicate, was the one with the problem. In the final stage two of the pinions had sheared at the plate and all of the pinion gears were missing multiple teeth. Unfortunately, without my knowledge someone put the broken gearbox in the crate with the robot right before we shipped so it's sitting in Portland right now, beyond further inspection. I'm not sure what failed first or caused the failure but side loading is a definite possibility. Our team will try to rig something up to improve that. Essentially, we're taking our first stab at a crab drive setup this year and there's a LOT of friction in the units. The banebots gearbox is used to turn the module.
Our current plan is to order two 48:1 gearboxes (one to use and one spare) as functional replacements and get them delivered to us at Portland. Thanks for the idea Madison, I have NO idea how we overlooked that alternative.
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In that low of a ratio, even stalling the motor won't cause the final stage to fail like that. To cause the final stage to fail like that you need to put a side load on the shaft. The only thing holding that final stage in alignment is the output shaft, so if there is a side load it will cause those gears to get mangled.
Sorry to burst the bubble on that, I'd just hate to see a bunch of false hope in the 48:1s just fixing the problem and have them fail similarly.