CNC & DNC

Computerized Numerical Control (CNC) and Direct Numerical Control (DNC):

Computerized Numerical Control (CNC): This system has a dedicated computer that controls NC functions. It consists of an electronic hardware capable of interpreting the software or program of instructions. It is often termed as soft-wired control. This system cans take input trough a tape or keyboard and the program can be stored. Whenever necessary the program can be recalled for execution of particular job. The program can be edited according to need. Any particular information or operation block can be called for display or use. The system has facilities for search. Diagnostic software makes trouble shooting much easier in this system. 

Direct Numerical Control:

Large Frame Computer is used and it performs many functions in a plant by controlling NC installations in the plant. At present the trend is towards Computer Integrated Manufacturing (CIM) and Flexible Manufacturing System (FMS). For such manufacturing setups centralized data handling and control is desirable. Main Frame Computer stores programs and after processing sends the control signals to respective NC systems. Since a large memory system is required substantial cabling work is involved in interlinking the NC machines to computer. This system suffers a set back when the mainframe computer breaks down.  In that aspect the CNC system is more useful

Components of Direct Numerical Control: 

1)      Central Computer

2)      Bulk Memory

3)      Communication Channels

4)      Machine Tools

 

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