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Although I saw many teams use the provided miter boxes, I did not see any robot that used them in the way that we did.
We put the motors on the side 90 degrees of where the FIRST plans had them. We gave a straight output to our main drive. Using the helical gears (lightened and on one side set of right-hand gears opposed to the provided left-hand), we provided a 90 degree drive to our "crab" wheels. So, we effectively had 1 input and 2 outputs from each of the miter boxes.
This really is the best picture that I have exhibiting how we used them; our crab wheels go inside the aluminum 2x4s where the triangles move up and down:
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