According to ISO regulations, when describing the motion of CNC machine tools, a right-handed rectangular coordinate system is used; the 

coordinate axis parallel to the main axis is defined as the z-axis, and the rotation coordinates around the x, y, and z axes are A, B, and C resp

ectively. The movement of each coordinate axis can be realized by the workbench or the movement of the knife, but the direction is defined 

by the movement direction of the knife relative to the workpiece. Usually five-axis linkage refers to the linear interpolation motion of any five 

coordinates among x, y, z, A, B, and C.

  In other words, five axes refers to the three moving axes of x, y, and z plus any two rotation axes. Compared with the common three-axis 

(x, y, z three degrees of freedom) machining, five-axis machining means that when processing parts with relatively complex geometric shapes,

 the machining tool needs to be able to position and connect in five degrees of freedom.

 The machine tools used in five-axis machining are usually called five-axis machine tools or five-axis machining centers. Five-axis machining

 is often used in the aerospace field to process body parts, turbine parts and impellers with free-form surfaces. The five-axis machine tool can

 process different sides of the workpiece without changing the position of the workpiece on the machine tool, which can greatly improve the

 processing efficiency of prismatic parts.