Hi, when i start the job a 3D toolpath ruff machining, it does the job well, after i restart the 3 d toolpath finishing machining, everything is ok but     the Z axis move over without touching the material at some place. The X and Y axis are ok. So my question is where is my problem. could it be the z axis motor is not proper configuration, could it be the stepdriver, could it be a mach3 problem. I Really thing i am loosing step in Zaxis.   Any suggestion......thks



michel