These are the plate pairs with gearhead servo motors and encoders. Each axis is isolated with plate mounts that keep the slewing noise to a minimum. 

The Alt. axis uses a different knob than what is shown here for a cable drive. Azimuth axis does not require this and a standard splined knob on the typically coated ground board edge is used. 

There is a 2" steel angle on the Azimuth axis plate pair. 
 

There is an adjustable lever on each plate pair to allow manual motion.
 

Cost: Plate pair pricing is the same whether stepper or servo, $207.00 for both pairs of plates. The servo version requires gearhead servo motors with encoders which are not included in the price listed here. Each customer will have a different gearing ratio need, changing the price of the servo motors, so the total price changes with that need. 
The smaller parts needed can be purchased online at www.mcmaster.com 
 
 

Please contact us for further pricing information or general questions.