How do I set up Mach3 to respond to metric files when my machine has been set up in inches? The machine manufacturer supplied an XML file for the machine, using imperial units. When I run his test programs it runs fine, but when I enter my G-code (from MeshCAM) the machine isn't responding correctly. I added G21 to the start of my G-code sequence as instructed by the manufacturer, but that hasn't solved the problem.