Subscribe Download PDF Why does the machine not move the correct distance? Imported User 6 2019-04-29 in FAQ's The most likely causes are: The Steps Per Unit value for the axis is incorrect. (see related article) The motor for the axis is improperly tuned (acceleration and/or velocity are too high) which causes motor stalling and lost steps. There is an electrical problem between the controller and the drive. There is a mechanical issue such as backlash or slippage.