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CNC is the abbreviation of Computer number control, a kind of automatic machine tool with program control system. The control system can logically process a program with control coding or other symbolic instructions and decode it so that the machine can move and process parts.NumericalControl (NC) technology refers to the technology of using digital instructions composed of Numbers, words and symbols to control the movement of one or more mechanical devices.Numerical control is commonly used to control digital programs by general or special computers.