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Unread 17-03-2016, 01:27
Anupam Goli's Avatar
Anupam Goli Anupam Goli is offline
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AKA: noops
FRC #1648 (G3 Robotics)
Team Role: Team Spirit / Cheering
 
Join Date: Dec 2010
Rookie Year: 2008
Location: Rochester, New York
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Re: PCH District: Albany & Dalton Predictions

Quote:
Originally Posted by JohnFogarty View Post
If you have a question about why 4901 had issues this season I'd be willing to discuss them in a PM. It had nothing to do with how I teach defensive driving strategy.



Question. Why did your Chain-in-tube need spacers in the tube?

Both of my teams used a solution based on the 221 systems simple tube chassis and used 221 systems double 17 tooth hex bore sprockets. When placed in the tube between two bearings there is no room or need for spacers.

Not sure what your team did differently that lead to your issues.
5632 discovered issues in their drive chain weeks ago and since replacing it we've been able to drive for hours straight without breaking. The issue we had stemmed from not using high strength 25 chain. We have replacements ready to go regardless.
Good Question!
When we CADed our chain in tube rails, we decided to use 2x1.5 tubing instead of standard 2x1. We were afraid of fabrication errors and manufacturing tolerances, so we wanted to be on the safe side and let there be room for spacing. We also went with 16T sprockets and created custom double sprockets by milling the hubs off half of our 16T sprockets and using retaining compound to glue one hubbed sprocket and one hub-less sprocket together. Our failure came from missing a single 1/8" spacer for one of our shafts. This misalignment broke a chain in the tube, and we had to run chain on the outside of the tube.

Good to know your team has replacement rails! I didn't think we had to use any of ours after our practice bot took quite the beating during driver practice, but $@#$@#$@#$@# happens.
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