What I must do to improve the accuracy of toolpath in Sheetcam. A dxf file with nominal dimensions are cut bigger with 0.2 mm if I setup the dimension at Nominal -0.2 it is smaller with -0.3-0.5, if I set dimension at Nominal +0.1 it is bigger with +0.35+0.4 and so on. Never I get the same difference...Could somebody give me a clue. Also, I would like to ask what strategy to apply when I cut circle inside. The circle is perfect except the fact that at the point where the endmill is starting the cut oversteps the rim of the circle, with let say 10% and the rim has a small print. So, the hole is not absolutely round it has a small round chanell along of it (on vertical axis at the place of starting - hope, I could explain in English).
Thank you,
Zoltan