4 axis CNC router is an automatic CNC machine tool whose spindle rotates 180° along the X-axis or the Y-axis to do 3D arc milling and cutting, which is based on the ordinary 3 axis CNC machine. 4th axis CNC router is a type of automated power machine tool with CNC controller for relief carving and sheet cutting, as well as adding the fourth axis (rotary axis) for 3D cylinders milling. In addition, the 4-axis CNC machine is divided into four-axis three-linkage and four-axis four-linkage CNC machine, not to say that the rotation is added, the axis is a four-axis linkage machine, and a CNC system with a rotating axis and a four-axis linkage can be called as a real 4 axis CNC machine. Because of the rotation movement of the 4th rotary axis, 3D machining of cylindrical, arc, and circular surfaces is realized.
