Check for lateral force on your shafts. For example, if a chain is to tight it will cause the shaft to bind. Make sure your drive system isn't fighting itself. Also when the breakers trip give the robot a break. Let the motors and breaker cool and it will be less liekly to trip again. Without the motor connected you should be able to spin the drive train freely, and it should keep spinning. You might also be attempting to gear the motors too high. Motors do not actually perform 100% to their specs, and you lose effeciency in the gears and axles.

... It's pretty bad when you read the title of a post and think, "Hmm ... 'errrrCLICK....CLICKerrrrrrCLICK!!!'?? I bet it's a drill motor question!" :yikes:

If the problem is electrical, my best advice would be give your system a rest once the breakers start to trip. Have some cold spray on hand, and spray a little on the fuse panel when you're letting your robot rest. Hopefully, the 40 amp fuses will be coming soon. :(

If your problem is mechanical, see the rest of the replies in this thread. We haven't done anything with or 1/2" drill motors yet, so from the mechanical aspect, I can't help you much. Sorry.

- Katie