Computer numerical control machining (or CNC) is a common manufacturing process that makes use of automated, high-speed cutting machines to create designs from metal and plastic stock. There are three, four, and five-axis standard CNC machines. There are many variations in the way CNC parts are cut. The workpiece could be left in place even though the tool is moving, the tool might remain in place even though the workpiece rotates and moves, or the workpiece and cutting tool could move together.
A CNC machine is operated by skilled machinists who program tool paths according to the geometry of the finished parts. A CAD (computer-aided designing) model provides the part geometry information. CNC machines are capable of cutting almost any metal alloy or rigid plastic with high precision. This makes custom-machined parts possible for almost every industry including aerospace, medical robotics, electronics, and industrial.