I checked the screws and retightened with a hand driver. Turns freely. Aligned correctly, but each time I reinstall the jig it acts differently - 60 deg past or 160 deg off. Moved from the C machine to the B. Cal rotates 2 1/2 revs then rotates at a creep and won't stop ignoring any key input - power off to stop. Retired and when, cursering to divot, starts rotating slowly and won't /can't stop? Measures a flat board just fins and just finished carving a project. Tried calibration with two different cards.
Really strange? I need to do at least 7 rotary carves for grand (and greatgrand) kid Christmas presents.