Thank you, I am still not sure what the issue is. I also have a demo of drufelcnc that seems to run this program with out issue. But mach3 gets through the first few lines. Moves to the corner lifts tool but then does not come back all the way down to the work.

it may depend on the G17 G18 plane selection.
those make IMHO only sense in combination with G40-G42.
but as sayed, i am a G-code specialist.
i never used somthing else than G17.

I may have to rewrite the code, It works in grbl on my other machine. This code was written in F360, I am no expert at f360 though. Thank you so much for your help.

had a quick look to the GRBL G-Code list. G17/G18 are not included, so they are ignored i think.

That makes more sense, thank you. Probably going to have to rewrite unless I take the g17 / 18 out right?