[Industrial Knowledge] 4-axis Machining v.s 5-axis Machining Milling is an important technology of cnc precision machining, which is widely used in medical, aerospace, optical, mechanical and other fields. In milling, the material is removed from the workpiece by means of a rotating cutter which feeds the material from the workpiece to the cutter shaft at an Angle. The axis of the milling machine determines the type and location of the workpiece. Here, let's take a look at the difference between four-axis and five-axis machining.