So, my first test with milling a PCB this AM started OK - traces and footprints are located where I expected, and the Z offset seems to be perfect. But when I switched to my 0.9mm drill to start on the holes, the spindle went into outer space. Looking at the Carbide Copper preview, the holes aren’t anywhere near the traces, and the scaling is all wrong. It even drilled outside the 4x6" stock size that I gave it.
I’d be willing to bet that somehow it’s scaled 25.4x, and it’s milling in mm but drilling in inches. But I only see one place to set the units in Carbide Copper, so I don’t get how they can be different.