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Computer Numerical Control (CNC)
CNC is a NC system that utilizes a dedicated, stored program computer to perform some or all of the basic numerical control functions. As of this writing the typical CNC system uses a minicomputer as the controller unit. It is expected that in future generations of computer numerical control, microcomputers will become predominant.
Because a digital computer is used in both CNC and DNC there is often confusion surrounding the two systems.
Figure above shows the general configuration of CNC
Main differences are :
1. DNC computers distribute instructional data to and collect from a large number of machines. CNC computers control only one machine or a small number of machines.
2. DNC computers occupy a location that is typically remote from the machines under their control. CNC computers are located very near their machine tools.
3. DNC software is developed not only to control individual pieces of production technology, but also to serve as part of management information system in the manufacturing sector of the firm. CNC software is developed to augment the capabilities of a particular machine tool. Except for the fact that a digital computer is used, CNC machines are similar and the part programs are entered in a similar manner. Punched tapes are still the common device for entering the part program into the system
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