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Unread 01-11-2012, 13:12
Andy Brockway Andy Brockway is offline
Engineer
FRC #0716 (Who'sCTEKS)
Team Role: Engineer
 
Join Date: Apr 2002
Rookie Year: 2001
Location: Falls Village, CT
Posts: 459
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Re: AndyMark CIMple Box Stripped Out

Quote:
Originally Posted by JesseK View Post
Also, is there any possibility that the output shaft bearing popped out slightly (the one in the plastic, where the encoder goes)? Any sort of lateral stress on the CIMple box output shaft (over-tension on chain, massive shifts in control that are opposite the robot's momentum which 'snap' the chain into high tension) can lead to fatigue in the plastic over time that causes the bearing to unseat. This could cause the opposite bearing on the output shaft (the one in the metal) to seize, which could then cause the CIM gears to shred. It only takes 1-2 degrees of bearing misalignment for these bearings to become VERY inefficient; any more and they probably did seize.
I measured the components of the CIMple gearbox including the 56T gear and output shaft. These parts are made to a loose fit tolerance. This in both the fit to the bearings and the fit to the 56T gear. Much looser than anything I have designed. It seems it would take quite a bit of misalignment for anything to bind.

Question - Is the 56T gear plated in your gearboxes?
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Andy Brockway
Team 716, The Who'sCTEKS