This picture shows how i mounted the motor to a piece of large angle aluminum, and then used the motor mounting bolts sticking through to hold the ball bearings. The gnatry does a nice job of tracking this way. I have to goto school, but when i get back i look forward to the first motorized testing, as i try and figure out the best place to position the motor. Im sorta guessing with the toothed belt centered to distribute the force is going to be best.
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