I have been trying to nut this little problem out i have set my machine using mach3 steps. My table size is 1200x2400, the x axis is mm perfect however my y axis is misreading, i have that set to what i thought was mm perfect and it is up to a certain length eg y set at 0 run it to 100mm and it goes 100mm. The job that i'm doing is 2000mm long but when i do the job it's only going to 1900mm. I'm running direct drive rack in pinion mod 1 rack 40 tooth gear. I'm not loosing steps otherwise i would hear it and there is no backlash, M524 drivers set at 1600 pulse mema 23 420oz motors. Is there another way to set up so it's more accurate then what it is now or do i just put up with it and extend my design by 100mm to compensate?