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Re: BaneBots Tranny
Thanks for the great info!
The transmission we have currently on the bot is a 64:1 36mm Banebots transmission (the black one from 2007 kit of parts) to open/close our claw. Not a lot of torque, but a lot of cyclical loading. Haven't gotten a decent cycle count on them yet, but I'd guess we eat through them after about 100-200 cycles of the claw. Mechanism pic and failure mode are shown in pictures... double-d interface in output carrier plate fails. Hardened output shaft is always fine.
Our current "solution": swap out the carrier plates when they wear out. Each transmission has 3, so we have a few spares. (but if anyone has more, we're willing to whip out the cash)
We were hoping this issue would go away with P60 since it has larger shaft diameter and hardened plates. Looks like case strength is the weakness of the new design though... not happy news. Shipping delays will keep us eating through the 36mm trannies for our first regional anyway, so we have time to find another solution.
First thing that comes to mind to fix the P60 twisting issue: Get piece of 1.75"x1.75", 0.125" wall aluminum tube and slip over entire tranny (machine things down to fit as necessary). Attach to bearing blocks at both ends through the 8 tapped mounting holes. Should prevent both blocks from rotating relative to one another, but probably won't stop the roll pin shearing issue.
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