pic: Inverted 3 CIM 2 speed gearbox with PTO

[traxxasracr1]

Originally Posted by asid61

Looks nice! How does it mount to the chassis?
The one thing I would caution against is that if you gear 6 cims that high, you're liable to brownout the RoboRIO.

Yeah, we have the bownouts in mind, thats why we want to experiment with this much power now so that we dont have to troubleshoot during build season. We want to try to implement some auto shift code to try to eliminate some human error. So if anyone has any input on auto shifting, please share. As of right now, I dont know if it would be best to put the encoder on the motor side of the gearbox, or the wheel side. (reading the speed of the motor vs. reading the speed of the wheel because it will change with shifting). Also, the gearbox mounts with 2 1/4-20 screws going through the 1/8 wall of the tubing on the frame, with the hex shaft mounted permanently to the frame, and just going into a female hex on the ball shifter, allowing the gearbox to come off without removing any axles.