Numerical Control (NC) refers to the operation of machine tools from numerical data. Data are stored on paper, magnetic tape, computer storage disks or direct computer information. CNC Systems which have some important functions like being automatic, precise and consistent motion control has different types in different areas.
             CNC machines used to be associated with high volume production due to the time involved in machine programming, however new computer technologies along with software advances allow easy programming of CNC machines for low production parts. The program is an organized list of commands used repeatedly to obtain identical results.
             The way in which the CNC program is used to interact with the machine tool defines the type of CNC system. Systems ýsing manual programming and punched paper or magnetic tape to store the program are known as numerical control machines. Equipment having a host computer controlliing one or more machine tools are known as CNC systems. Either type may have a dial control future, which is the ability to dial directly each axis dimension for the workpiece.
             Computer numerical control systems use a dedicated program to perform NC functions in accordance with control commands stored in computer memory. The computer provides basic computing capacity and data buffering as a part of the control unit. CNC is also known as "soft wired", implying that the can be changed along with built-in control features. In addition, the computer is used as a terminal to accept information from another computer or telephone data. If the host computer is external to the machine tool and commands several machines as well as other NC devices, the system is a direct numerical control (DNC) system. If a microprocessor that interacts with the host computer is used as a resident controller in the machine tool, the equipment is a distributed numerical control (DNC) sys
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