The Industrial 4-Axis CNC Wood Milling Machine with Linner ATC Spindle Kit operates on the X, Y and Z axes like a 3-axis machine, but it also includes a rotation around the X-axis, known as the A-axis. This is the 4th axis added to our machining process. In most cases, the workpiece will rotate around the B-axis for cutting. Since the spindle on this CNC machine can swing from side to side, the spindle can approach the workpiece from many different angles and effectively machine three effective machining surfaces for three-dimensional machining of cylindrical, curved, and radiused surfaces. This four-axis CNC machine tool can not only realize plane engraving, but also three-dimensional engraving of irregular workpieces. This kind of woodworking CNC machine tool is suitable for the processing of ordinary workpieces, three-dimensional workpieces, complex workpieces and irregular shapes.