[ChrisH]

Originally Posted by RogerR

i personally would use a set screw as deepwater suggested (just make sure the screw doesn't come loose...). but, if you don't want to do that, here's a post from Dr. Joe about attaching gears to the output of the globe motor, which has a similar output shaft:

We have used double-D broached holes on metal gears with the Globe motors. It worked just fine. When we modified last year's robot as a practice bot for this year, those gears wound up working a lot harder than they were designed to. They still work just fine. Not sure how the plastic gear will work, but a D shaft will probably work bettter than a key way or set screw.