Drawing: MDM001/4 Motor: GM8224D201 Motor Encoder: 500 lines Gear ratio: 19.5 Limits: two-level in and out limits separated by 1.5 inches Controller: PMAC#4 Drive Amplifier: Amp Homing: use lower limit switch Scale: 18725 encoder pulses per mil!The Focus motor turns a worm gear which in turn turns three ball screws which in turn moves the secondary. The focus position has been defined as 0 when at the inner limit when the secondary is closest to the primary. The outer limit is about 1500 mils.
Blurry picture of secondary wiring.