I have delivered on the milling machine tool step-servo motors FL-86-156 and driver M880.
I operate by means of Mach3. On the machine tool is linear encoder. Sometimes there are skips of steps. Help will write macros which to switch off Mach when there will be a difference for example 0.2 millimetres between indications of a step-servo motor and encoder.
For us in Ukraine hobby CNC is poorly advanced, it is difficult to it to consult.