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Unread 09-10-2015, 20:03
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Monochron Monochron is offline
Engineering Mentor
AKA: Brian O'Sullivan
FRC #4561 (TerrorBytes)
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Re: Cause of chain ratcheting issues

Quote:
Originally Posted by BJT View Post
It looks like your whole motor mount is sticking out quite a ways from where it attaches to the robot. As others have said, you maybe should have used that piece you cut out to support the motor mount and/or the shaft. Two sprockets need to be as solidly tied together as possible to eliminate that change in c-c distance you are experiencing.
This isn't quite the problem, the position of the motor in relation to where it mounts to the robot hasn't caused skipping at all, rather it was the perpendicular alignment of the chain and the recent extra load that caused the skipping. As I said before, this setup ran without issue since February until now. I don't think we could have used the cut away piece of 2x1 because the shaft is hex, the shaft extended past the part we cut away, we had no way to turn the shaft down, and no bearings we found could fit in that 1" aluminum face.

What you say about tieing the sprockets tightly and supporting the motor shaft is all absolutely true, but it's important to know that none of that caused our ratcheting. I know this to be the case because we haven't changed any of that and our ratcheting is completely gone.