Question

Descriptive questions

i.      How is computer numerical control (CNC) distinguished from conventional NC?

ii.      Name the ten features and capabilities of a modern CNC machine control unit.

iii.        Name the six-part characteristics that are most suited to the application of numerical control.

Answer 1

SOLUTION-

(i)

Computer numerical control is the process which is used in the manufacturing companies or sector, it involves the control of machine tools using computer.

In this process computer executes preprogrammed sequences.

Where as conventional numeric controls is not successful now. Earlier in the 40's and 50's, there were m/cs that were used puch cards to operate simple programs rather than computer used in CNC. That tape can be used for same part again n again. Now in CNC these punch cards and Tapes are replaced by the computers. Which are much flexible, faster and easier.

(ii)

Following are the four features and capabilities identified in the text for a modern CNC machine control unit:

1. Storage of more than one part program
2. Various forms of program input, such as punched tape, magnetic tape, floppy diskette. RS-232 communications with external computers, and manual data input
3. Fixed cycles and programming subroutines (macros)
4. Program editing at the machine tool level

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