I'm about to pull my hair out. I reinstalled mach and did my driver test. Everything shows good. The auto function that sets the steps per inch states my new value should be 1818.896532. Ok. So in my motor tuning on the X axis the steps are set to 1818.896532, max speed is 120, Step uS is 0 and dir is 0. I open the jog screen and set the cycle jog step to 1.0. Next I zero the caliper mounted to my X axis. I make 4 moves in the + dir on the X axis and come out with the following: 0.995, 2.014, 3.034,and 4.055. I zeroed it again and made 4 more moves in the - dir and had these values: -0.995, -2.012, -3.031, and -4.047. I have checked everything I know. Could this be a drive problem (203V) or a motor problem (KL34H2120-42-8A). My pc has 2.5 GHz pentiium and 2 GB of memory. The only software that has been installed on it is Windows XP and all of the updates and Mach3.