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NC (numerical control machining), refers to a process for parts on CNC machine tools for machining, process planning and CNC machining of conventional machining Generally speaking is the same, but significant changes have taken place. Digital information control parts and tool path machining methods. It is the solution to breed changeable parts, small batch, complex shape, high precision problems and achieve efficient and effective way to automated processing.

Technological requirements and processing performed. It refers to conduct process machining of parts on CNC machine tools.

CNC machine tool is a computer-controlled machine tools, machine tools used to control a computer, whether it is a special purpose computer, or a general purpose computer are collectively referred to as CNC system. CNC machine tool motion and supporting actions are controlled by the instruction issued by the NC system. The instruction is based on numerical control system of the workpiece material, processing requirements, the machine features and systems under the instruction format (CNC language or symbols) compiled by programmers. CNC system sends to the servo devices and other operational features of program instructions or terminated in accordance with information to control the various movements of the machine. When the parts of the processing program, the machine will automatically stop. Any kind of CNC machine tools, CNC systems in its program instructions if there is no input, CNC machine tools will not work. Controlled machine tool operation generally includes start, stop; start and stop the spindle rotation direction and speed of transformation; the direction of feed movement, speed, way; compensation for tool selection, length and radius; replacement tool, cooling liquid is opened, closed and so on.