# The Role Of X, Y, Z Axis Of CNC Machine Tools ## Definition Of X、Y、Z Axis：

In order to determine the movement direction and movement distance of the machine tool, a coordinate system must be established on the machine tool to describe the relative position of the tool and the workpiece and its changing relationship.

Extend the thumb, index finger and middle finger of the right hand at 90° to each other, pointing in the positive direction. Then the thumb represents the X coordinate, the index finger represents the Y coordinate, and the middle finger represents the Z coordinate. Regulations of the standard coordinate system: The standard coordinate system is a rectangular coordinate system. According to the regulations of the right-handed rectangular coordinate system, the thumb, index finger and middle finger of the right hand are stretched out and are 90° from each other, pointing in the positive direction. Then the thumb represents the X coordinate, the index finger represents the Y coordinate, and the middle finger represents the Z coordinate. According to ISO regulations, when describing the motion of CNC machine tools, the left-handed rectangular coordinate system is used; the coordinate axis parallel to the main shaft is defined as the Z axis, and the rotation coordinates around the X, Y, and Z axes are A, B, and C, respectively.

The movement of the Z coordinate axis is determined by the spindle that transmits the cutting force. The standard coordinate axis parallel to the spindle is the Z coordinate axis, and its positive direction is the direction of increasing the distance between the tool and the workpiece. The Y coordinate axis is determined according to the X and Z coordinate axes and according to the right-hand Cartesian coordinate system. 