Quote:
Originally Posted by crazyStone
Perhaps your correct but that's the reason for the prototyping and that kind of gearing ratio can be changed with the gearing from the cim which would not be terribly difficult to accomplish. The main goal is to see if the module can even withstand the stresses of housing the shifting mechanisms and continue to work properly and reliablely.
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There is no "perhaps" in this case. You are limited to a certain amount of traction and thus possible force you can transmit to the ground. With that gearing you will not be able to transmit all that force so then you will just be exceptionally slow. Have a mentor with a physics background or at least some physics knowledge explain how to find the maximum force you can apply based on friction and normal force. It will greatly improve future designs.
Also like some people have already said, use the shifting of the modules to accomplish the gear switching. You have no need for 2 speeds on each wheel and it greatly complicates things and makes the entire module heavier.
One final comment is it looks like the gear on the traction wheel is a higher DP than the rest of the gears which is counter intuitive to typically accepted practices. The highest forces will be seen by that gear so typically you want that gear to have the lowest DP. Most teams run 20DP, .375 fce width gears in the final stage of a transmission.