I bought a 3020 mill primarily for making PCBs and small panels and I think I might have an accuracy problem creeping in somewhere in my operation or setup. Here is my routine:

1. Export tracks HPGL milling file from CAD program.
2. Export outline HPGL milling file from CAD program.
3. Export Excellon drilling file from CAD program.
4. Import tracks milling file to SheetCAM, set outside contour routing operation and save job then save TAP file from post processor.
5. Import outline milling file to SheetCAM, set outside contour routing operation and save job then save TAP file from post processor.
6. Import drilling file to SheetCAM, save job then save TAP file from post processor.
7. Load tracks milling TAP file into Mach3 and do.
8. Load drilling TAP file into Mach3 and do.
9. Load outline milling TAP file into Mach3 and do.



Is this something that a Smoothstepper would sort? Or some other problem?