I have the units set to MM with Alt-U and my gcode is using MM also. However, when I run the gcode I max out the Z axis on this line.
N150G00G43Z31.750H1
This above line is correct, Z should go to 31.75mm/1.25". However, in looking at the coordinates in mach3 I can't figure out what units they are in? I did some rough measurements and see that moving 1" reads about 3.9 in mach3. This is the reason it is maxing out the Z axis when trying to move to 31.75. Any ideas what is wrong here?