MODEL RELEASED. Metalwork. Metalworker (right) supervising a CNC (computer numerical control) milling machine in operation. The machine consists of a rotating cutter and a moveable table, which holds the material that is to be cut. The cutting fluid sprays onto the surface area and acts as a coolant to reduce the friction co-efficient between the grain and workpiece. A CNC milling machine is controlled electronically. The design for the metal component is uploaded to the machine and used to control the cutting device.