Quote Originally Posted by masinecc View Post
And what is ur explanation for plunging further and further into the material with every next circle? Could it be bad cracked CAM program( i use Aspire 3.0) ??! My shielded cables are not grounded yet, could this cause a missing steps?!
This won't be copied software or Mach3 fault. It will be one of 5 things.
#1 Mechanical issue so slipping coupler or something.
#2 Electrical noise from spindle affecting signals.
#3 Incorrect setup of Steps per milimeter
#4 Pulse signal is set wrong in drive so changing on wrong side so losing 1 step on every directiuon change.
#5 Low power parallel port voltage so not enough voltage differential between high and low signal causing lost steps.

My suggestion is first check all mechanical connections and wire connections. Then identify if noise by running G-code in air without spindle running. Measure starting height and check when finished.
If ok then check the Active edge set in the drive.