I have a Harbor Freight Mini-Mill that I converted to a 3-axis CNC machine using a Heavy Metal ball screw conversion kit with Automated Technologies electronics. I use Fusion 360 for design and have installed the Mach4 post to my local library from Autodesk's website. I have made a small bottle opener to test. Every time I run the g-code the bottle opener comes out about half size. The scale between my design and the actual part when cut always seems to always be off and it comes out shrunk. My machine setup units are set to inches and my unit mode is set to metric. Could it be my motor settings are off?
Motor Settings:
counts/unit; 40960.0
units/minute; 35
units/sec^2; 0.49
My motor has 200 steps (1.8deg.) each and has a 128 microsteps.
My math: (200*128)/(0.625)=40960.0 counts/unit