06-10-2015, 23:15
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no bag, vex only, final destination
AKA: Pinecone
 FRC #0228 (GUS Robotics); FRC #2170 (Titanium Tomahawks) Team Role: Mentor
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Join Date: Dec 2008
Rookie Year: 2006
Location: Glastonbury, CT
Posts: 7,630
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Re: Cause of chain ratcheting issues
It looks like the sprocket on the bottom is cantilevered almost an inch away from the gearbox face. This is a big part of your problem - there is a lot of flex in the VP output shaft when you have an unsupported load that far from the output bearing.
No real way around it; you have to support the other end of the shaft or move the gearbox closer. If you didn't cut a big gash in the 1x1 tube right by the output shaft, you could have popped a half inch bushing in there and turned the end of the VP output shaft to round in order to ride in the bushing. A bit more friction than is ideal, but it'll work.
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