I know, that µstepping don't enhance the real resolution. But in the case of an exact circle, it'll enhance the circular form. And maybe I can reach a little bit better fit. with my little Emco, I have only
72 ppr, so i have a minimal distance from 0,0277mm in diametre. Thats a bit big if I want a tight fit for ball bearings or similiar parts.
Thats only, because the normal *4 or *8 µStep brings a bit strange results, that can't display on a
standard XYZ-display of a machine.