[gorrilla]

Originally Posted by dtengineering

I know that you are going to test this design before you use it, so I'm prepared to be proven wrong, but my "gut sense" is that this design may be prone to failure due to the repeated hammering on the axle as the motors shift from forwards to reverse.

Keeping the sprocket as close to the wood as possible should minimize the effect of torque, but I think you could do that even better by gluing a second thickness of plywood around the axle hole. In fact, I would be tempted to drop down to 1/2" plywood, then reinforce the axle mounts by gluing a piece to each side to help distribute the stress, but more importantly increase the lever arm between the t-nut and the nut.

Jason

the only problem I could see, is the t-nut loosening after awhile(by the upward and downward motion), but thats an easy prevention.........