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dknguyen said:It's always one of the dumbest and worst problems when working with wheels and motors (other than finding a gearbox...maybe). It's different for every situtation. You could make it a square shaft, or drill a hole in the gear and file a flat part into the shaft and use a set screw. Depends on how much force you need to support.
What's your setup? If you have access to a mill and a lathe it makes everything much easier and more reliable...but few can do that. For the rest of us it ends up being a make-or-break decision for a design.
Hint: go with servos motors and their accessories, or go with radio-controlled truck parts.
Bryan76 said:Is there a place that you could recommend for buying gearboxes and servos?
dknguyen said:www.servocity.com
Good for servos and other servo knicknacks
www.lynxmotion
Makes other servo stuff and knicknacks which are useful.
www.banesbots.com
Lots of gearboxes
www.robotcombat.com
Has a lot of nice (very high powered gearboxes)
www.rc4wd.com
If you're into bling and shiny RC car transmissions. They have gearboxes and the like too. They are designed for driving shafts and things.