3 Axis Milling – Milling is the machining process of using rotary cutters to remove material from a piece of metal, wood, foam, or plastic, to form the piece into a specific shape. 3 Axis Milling is employed when the cutting requires simultaneous controlled movement of the X, Y and Z axes. Although still used in some milling facilities today, it is the least advanced of the three main axis millings available on commercial markets.