Introduction to Direct numerical control (DNC)

DNC is a manufacturing system in which several machines are controlled by a computer through direct connection and in real-time.

• Also, defined by EIA as DNC is a system connecting a set of NC machines to a common memory for put program or machine program storage with provision for on-demand distribution of data to machines?
• The tape reader is omitted.
• Involves data connection and processing from the machine tool back to the computer.

Components

1. Central computer
2. Bulk memory which stores the NC part program
3. Telecommunication lines
4. Machine tools

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• A central computer connected to several machine tools and control them.
• Part program of all machine tools are stored in the memory of the central computer and transmitted on direct transmission lines on demand
• Two-way information flow takes place In real-time
• Various machine tools can communicate with the computer in real-time
• Programs in full or segment can be transferred to NC machines
• Computer can be used for program coding
• No tape readers are used
• No limitation for the number or size of programs stored

Advantages of DNC

• Elimination of punched tape and tape reading
• Greater computational capability and flexibility
• Convenient storage of part programs in computer files
• Report on shop performance