Quote:
Originally Posted by Aren_Hill
A. The output shaft needs to be vertical
B. It would need to accommodate 2 small cims and maybe a big one also
C. It needs to be as short as possible meaning from the back of the motors to the outer plate of the transmission, hopefully around 6 inches in total length, I forget the length of a cim but the shorter the better
D. 3 or more speeds capable of being shifted without pneumatics, servo's or one of the small motors in the kit will be used. preferably servo's
E. customizable ratios.
Any advice?
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The best piece of advice I can give you is, ease up on your constraints. What you're asking right now is rather unrealistic for use on a FIRST robot. Ignoring the DeWalt transmission, 3+ speed transmissions have been rather large (same with any multi-speed for that matter) compared to your current requests. Here are a handful of links to pictures/white-papers on various 3/4 speed transmission used by FIRST teams in the past, each of which violate one or more of your design constraints.
http://www.chiefdelphi.com/media/papers/1580
http://www.chiefdelphi.com/media/photos/26744
http://www.chiefdelphi.com/media/photos/26830
http://www.chiefdelphi.com/media/photos/17476
http://www.chiefdelphi.com/media/photos/17478
http://www.chiefdelphi.com/media/papers/1539
Good luck, and I certainly hope you can pull off your design successfully at your current restraints, and I hop these pictures provide some helpful hints into possible directions to pursue.