Why does the machine not move in the correct distance?

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.