I have a Lightmachine 0200(Sherline) with Lightmachine 100oz steppers and controller. I was making a sign for a friend and there are 4 identical borders(an L shape design in each corner). When the machine gets to the 3rd border it screws up by 1/8 of an inch and then does the next one fine as is everything else is fine. I,ve checked the code with Mastercams compare tool, and re examined the code several times to find no fault. The verifications show no probs. I also slowed the feed down to 30%(turtle) and still it skips steps ever so slightly that I can't here it skip. My question is what are some of the things that can cause this type of skipping?