Originally Posted by
Kosh
I had this exact thing happen to me today. But I have video and was able to "sort of" figure out what happened. Doesn't sound like your case though.
I this situation, I am running a BIG bit (14mm x 125mm), and it has to go almost to the top of the Z stroke in order to clear the rough stock (Guitar neck with heel).
What I'm seeing happening is that while executing "G0 Z97.750", the Z motor sounds like it is missing steps due to reaching the limit of it's travel. Then, because Z
stopped moving when the software thought it was, the next Z movement is off by quite a bit. The thing is, even if I had hit the end of the stroke (which I didn't, limit switch wasn't triggered), it wouldn't be off the by amount that I then see on the MACH3 readout (Z of 97 when I'm actually closer to 50).
This happened to me 3 more times, but I was able to stop, re-zero, and start in those cases.
I can post vid if you want.