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 g-code the part comes out mirrored. My y-axis seems to be inverted. When the y-axis is supposed to be traveling in the y- direction it travels in the y+ and visa versa.