Quick Comparison between NC and CNC

NC Numerical Control
CNC Computer Numerical Control
Punched tape/ part program need to load on the machine for each job. It leads to tear and wear of punched tape.

Punched tape or programme instruction load once in the machine, then it is stored in computer memory. This program is called from for each job. That reduces the use of unreliable punched tape.

The problem of part program mistakes in punched tape

The ability to diagnose and debug the part program find malfunctioning before the actual job is performed.

The program is not easily editable; the editing punched tape is difficult. The whole process was slower.

The program can be edit immediately by using other input devices (keyboard)

Limited flexibility

Greater flexibility, which provides easy opportunities to introduce new control option. It also allows the conversion of the unit in the part program (eg: inch to centimetre)

Low accuracy and productivity when compared to CNC.

High accuracy, productivity and repeatability.

Installation and maintenance cost is low

Installation and maintenance cost is high

No optimal speed and feed selection during machining.

CNC allows the changes in sped and feed. It is a total manufacturing system.

It never favours the continues running.
CNC can run continuously 24x7.




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