Hi there, I'm new to all of this but I just got a Zen Toolworks 12"x12" CNC machine.  In Mach3 I've set up all the ports and pins, set soft and hard limits and calibrated the machine.  All is running well however when I import my G-code my design, instead of being 80MM x 80MM or so, it's huge, its probably 2.5 x 2.5 feet.  I am using artCAM to build the code and have a Post processor for millimetres.  Any ideas as to whats going on?

Oh, I want to try the forums before I do a phone call