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Thanks for everyone's replies!
I've done some more research, and instead of direct drive, I've decided to go with a friction drive system with servo motors.
I'm thinking of rubber, urethane or stainless steel rollers. Does anyone have any opinions about which material is best?
Also, I'm going to use 2 motors for the RA. One for tracking, and one for slewing the scope. The tracking motor will be at 700RPM with a series of friction rollers with a ratio of 1000000:1 to reduce the speed to 0.0007RPM. I will then have a second motor further up the friction roller system at 1000RPM which will be reduced to 1RPM. In order to stop the motor that is not in use from generating voltage when the shaft is turned by the motor in use, I will have a switch on each motor to create an open circuit when it's not in use. The issue now is how can I stop the scope from wanting to drop/rotate under it's own weight? If the scope and counterweights are balanced correctly I don't see there being a huge problem, but the last thing I want is to build a scope and have it destroyed because the mount wasn't designed properly.
Thanks!
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