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Unread 20-12-2007, 17:25
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Richard Wallace Richard Wallace is offline
I live for the details.
FRC #3620 (Average Joes)
Team Role: Engineer
 
Join Date: Jan 2003
Rookie Year: 1996
Location: Southwestern Michigan
Posts: 3,629
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Re: What is the best place to mount CIM motors...?

I like driving the center wheels with relatively short #35 chains, and placing the motors fairly close to the center -- anywhere from directly above the center axle to offset as much as 5 inches fore or aft, depending on where we need the CG and what scoring mechanisms are required. #35 chain provides a little extra reliability, and re-tensioning is not a problem because it won't stretch much. The corner wheels can be driven with longer #25 chains, one for each wheel, two driven from each center wheel. So center wheels each get one #35 sprocket and two #25 sprockets.

This set-up requires some method of tensioning the corner wheel chains. Several good methods have been discussed in other threads.

We used the set-up described above on our 2007 robot with good results. Drivers reported easy handling. We only had one chain failure all season, and that one was easily repaired -- a few minutes work field-side between elimination matches at Boilermaker.
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Richard Wallace

Mentor since 2011 for FRC 3620 Average Joes (St. Joseph, Michigan)
Mentor 2002-10 for FRC 931 Perpetual Chaos (St. Louis, Missouri)
since 2003

I believe in intuition and inspiration. Imagination is more important than knowledge. For knowledge is limited, whereas imagination embraces the entire world, stimulating progress, giving birth to evolution. It is, strictly speaking, a real factor in scientific research.
(Cosmic Religion : With Other Opinions and Aphorisms (1931) by Albert Einstein, p. 97)