Mach3 is all screwed up. I'm running a Sherline 5400 CNC mill, and a XP Pro computer. When I move 2" according to the marks on the X axis, the DRO in Mach 3 reads 31.8700. Mach3 is set to Inch. I tried to cut a circle but it ended up being about 1/4" dia. instead of 2". Any idea's as to what setting may be screwed up?