Computer Numerical Control machines are widely used in manufacturing industry. Machines include tools such as lathes, laser cutting machines, roll forms, press brakes and printing presses. Machines use the same techniques as many other mechanical manufacturing machines but are controlled by a central computer instead of a human operator or electric switchboard.

Computer control programmers and operators use computer numerically controlled (CNC) machines to produce a wide variety of products, from automobile engines to computer keyboards. Computer control programmers and operators normally produce large quantities of one part, although they may produce small batches or one-of-a-kind items.

Machine programmers, also referred to as numerical tool and process control programmers-develop the programmers, develop that run the machine tools. They often review three-dimensional computer-aided/ automated design (CAD) blueprints of a part and determine the sequence of events that will be needed to make the part. This may involve calculating where to cut or bore into the work piece, how fast to feed the metal into the machine, and how much metal to remove.

After the programming work is completed, CNC Operators also referred to as computer-controlled machine tool operators, metal and plastic set up the machine for the job. They download the program into the machine, load the proper tools into the machine, position the workpiece on the CNC machine tools like spindle, lathe, milling machine, or other machine and then start the machine.