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Unread 28-10-2006, 10:21
Joe Johnson's Avatar Unsung FIRST Hero
Joe Johnson Joe Johnson is offline
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Re: pic: Mecanum Wheel Module Gearbox

M,

Looks nice. I have a few questions if you'd be so kind.

What holds the plates in the right positions with respect to each other?

If I have it right, the CIM comes in the largish hole and connects to the middle plate. Is it just the screws and the intermediate shaft that keep this middle plate in place?

How do the outside plates locate with respect to each other? Is it just the motor and the two longish bolts?

As to ratio, I assume the 12:40 is done in gears on the first stage off the motor. The 18:72 is done in #25 chain? Is that right? If so, how are you tensioning the chain? It is okay to say there is no tensioning ability, you just have to know what you are doing and do it on purpose, not by accident -- which is almost always a disaster. If you don't have tensioning, how do you say you can change the ratio by changing the sprockets -- this would almost certainly require you to change the center distance of the middle shaft to the wheel shaft.

Finally, a #25 pitch 72T sprocket is almost 6" in dia. I must have something screwed up in how I think this thing works because I can't see room for this size disk. Help straighten me out.

Joe J.

P.S. I am not picking on M here. I know that she is a pretty smart cookie. I am mostly asking these types of questions in public as a How To for folks to evaluate design concepts. JJ
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