See picture. Some of my 90 deg corners are being cut off. Circled red. Top cut where the tool does a 180 is correct. This isnt even the worst shortcut. Later it gouged about 3/4" off the mark. Cutting with a 1/4" 2Fl EndMill.
This happened before but isnt common. I cut the same part yesterday with no problems. I've cut many other parts without issues - including aluminum. The machine has no backlash that I've ever seen - parts are typically <0.5mil within tolerances.
I did notice the GUI was slow before starting. Also, during Touch Off the automatic reload of the file took 2-3 mins where it typically takes 10-20secs. Wierd!?!
First 5 step passes (50mil/pass) were fine and within tolerance, machine just got lazy suddenly.
I was in G64 Continuous Path mode. I am not sure what my P is but it is the default value. This would have to be a pretty bad P to be this bad! I will switch to G62 or at least specify a tight tolerance on P.
I didnt get any realtime errors and never have since tuning the realtime system years ago.