Yohudi,
reverse engineering is an accepted method of setting up the steps count. See page 55 of 157 (5.5.2.3) in the Mach3 pdf doc

http://www.artsoftcontrols.com/document ... _84-A2.pdf

My method is very precise, using 'CenterCam', a webcam mounted in the spindle and a 300mm rule. I can easily resolve 0.1mm
Backlash (of my leadscrews) is easily detected and measured too, as is @go to zero'

I'd recomend setting one up, if you dont already have one. Dead simple, pecise, cheap as chips and another toy to play with. :lol:

BFN