[sanddrag]

One thing Max, where did the 19 Nm number come from. Orginally I had said 13. Did I miss something or did you add a safety factor?

Thanks for the calculations Matt, this is good news. We will go ahead and give it a try, then I guess if it does't work we'll try 1/8, or pin.

Also, I forgot to mension that the key will be only under the face width of the gear, (.5) not under the hub. At motors stalled, the axis of this gear could have up to 20 Nm of torque on it, but I don't think our wheels or cicruit breakers will allow that. Are you still confident that it can take the load? What about when slamming between forward and reverse (which we'll try not to do but it would be good to know if we should worry or not). Thanks again.