Computer Numerical Control (CNC) – A numerical control system in which the data handling, control sequences, and response to input is determined by an on-board computer system at the machine tool. A control system in which numerical values corresponding to desired tool or control positions are generated by a computer. It’s also known as computational numerical control; soft-wired numerical control; stored-program numerical control.
CNC means the method of controlling machines by the application of digital electronic computers and circuitry. Machine movements that are controlled by cams, gears, levers, or screws in conventional machines are directed by computers and digital circuitry in computer numerical control (CNC) machines.
Computer numerical control provides very flexible and versatile control over machine tools. Most machining operations require that a cutting tool be fed at some speed against a work piece.
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