pic: Quick-Change Chassis 2

[GeeTwo]

Originally Posted by Ari423

..since they are non-backdrive-able, that could be a problem when doing hard direction changes with high CoF wheels.

[With apologies to Inigo Montoya] I don'a think that word means'a what you think it means.

Non-backdriveable means that torque applied to the output shaft will encounter sufficient friction that it will not turn the motor (with no voltage applied to the motor). It does NOT mean that the system cannot be driven in reverse from the motors.

Originally Posted by Kevin Thorp

We also thought about inverting the assembly, but that would make the mounting screws more difficult to reach.

While I have obviously not spent as much time with your design as you have, I don't see this at all. As I'm picturing the fasteners, this would be a matter of switching the threads from the chassis to the module, with no net difficulty in assembly, other than the requirement to hold the module up as the machine screws are being threaded. If a few alignment tools were in place, even this could be accomplished with gravity.