Hey guys,
New to the forum, so please forgive any ignorance.
I have a CNC supra knee mill that i converted to mach3 last year, it ran great but as of just a couple weeks ago it started to have issues moving from 0 to where the first opperation takes place.

For example if i took a square indicated the corner, and then cut a bore in the middle. the bore would be in spec, but located .030ish to the X negative. and then it would go exactly back to 0.

Ive also run old programs that i knew were in spec when i did them, and they display the same issue.

If anyone could help, or needs more information, I would be extremely appreciative.
Thank you,
Calvin

I would suspect a mechanical issue is the cause - perhaps something loose ?

I would look at the Steps Per settings for that axis. Missing steps would not return to zero and most times a loose connector will not return to zero. It is possible the XML got corrupted and the value is now wrong.

Just a thought , (;-) TP