The steps are as follows.

• 1.Press “Z-“,the spindle will ; move quickly down to the workpiece
• 2.When the tool near surface of workpiece,press “Shift”,change jog mode to step mode
• 3.Press “Z-“,the spindle will ; move down step by step
• 4.When the tool touch surface of workpiece,press “XY=0”,clear value of X and Y coordinate

The video is as follow.