Linuxcnc -> mesa 5i25 pwm -> Bob -> AMC drive -> Servo -> Encoder -> mesa 5i25 encoder counter -> Linuxcnc
I have the pwm set to 20khz
I have actually tested this setup - and others have actually run it using the printer port. You loose the high frequency pwm and its higher levels plus you have to be aware at your max encoder counting speed. But it does work.
Here is the adapter we made to go between the servo shaft an the timing gear.
Comparing the servo to the stepper