Quote:
Originally Posted by s_forbes
After some more thought, I guess there's 3 main requirements: - Spacing of the motors (easy peasy)
- Correct alignment of both pinions on each shaft (hmm, tricky)
- Assembly such that the pinions of each motor are in synch with every other motor (this part would be fun!)
For what it's worth, the Penguineers used a shifting design with two pinions per motor successfully in 2012. Their solution to these issues was apparently to make 4 gearboxes, one for each wheel. 
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I think you could make a fixture with pins to align the pinions and a guide for the broach to ensure the keyways are all clocked the same. Is it worth the effort? Probably not.
I know 971 has run dog shifting gearboxes with two pinions on the motor shaft. I wonder how they solved the problem.