What do you use as a sensor for the position of a tool turret ?
or would it be easier to use a home switch and then count steps.
The turret will go into reverse to lock.

Converting a horizontal 4" rotary table using a parking pawl ala Denford. See an example.
Mine will be 4 position.

I have Mach3, Gecko 540, PS. Will be using Keling Nema 23 motor.