Hi everybody. I am new to the CNC. I have purchased a sherline CNC mill. I have download mach3 but it will not reset so I can use the prograam. So I downloaded mach2. It works fine. But tuning the motors seems good. I move it .100 and it moves .100 with the indicator. But when I go and run the program. It doesn't move the same eveytime. I have the X moving 2.5" after it drills the first hole and moves to the net locaation. Some times it is short about .100- .150 and times it is long +.100 to +.150 and sometimes it hits right on. Also the Z seems to get shorter with each hole it drills. I am not sure it is missing a step or I don't have the motors tuned right. Please help. I would appreciate it.
Thanks