Ok so I'm not good at math. Built a fixed gantry 3 axis MDF machine. Got everything together and running. Noticed a funny thing while testing travel versus coordinates. Everything in gcode is about 1/10 actual size.

My fix was to change the pulse per increment in Mach 3 from (calculated) 2000 to 22000 on each axis. That seemed to dial it right in. But obviously I've done something wrong along the way. Is this just another newb error? If so, what might I do to correct it?