Hello all,
           I had this Knee Mill conversion before and decided to put the Dc servo back again. I need some help on step/unit calculation:
The ballscrew pitch = 5mm
Gear ratio: 1:4 (the gear on the dc motor side is a T18 and the ballscrew left side is a T72 aluminium timing gear)
The encoder used is a US digital E5kit, encoder CPR = 500





thanks,
 

Found the stepper calculator by StepperCalc_ALENZ_rev1:

What is thread starts and Lead?

Thread starts is the number of individual (separate) threads on the screw -I would assume your is single start.

Lead is the calculation of how many mm the nut moves for one complete revolution of the screw.

Tweakie.

Ok, thanks.