Quick Comparison between NC and CNC
Read: What is Numerical control? Applications, Advantages, Limitation
What is CNC? Advantages, Limitations, Applications
NC Numerical Control
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CNC Computer Numerical Control
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Punched tape/ part program need to load on the machine for each job.
It leads to tear and wear of punched tape.
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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.
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The problem of part program mistakes in punched tape
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The ability to diagnose and debug the part program find
malfunctioning before the actual job is performed.
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The program is not easily editable; the editing punched tape is
difficult. The whole process was slower.
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The program can be edit immediately by using other input devices
(keyboard)
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Limited flexibility
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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)
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Low accuracy and productivity when compared to CNC.
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High accuracy, productivity and repeatability.
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Installation and maintenance cost is low
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Installation and maintenance cost is high
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No optimal speed and feed selection during machining.
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CNC allows the changes in sped and feed. It is a total manufacturing
system.
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It never favours the continues running.
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CNC can run continuously 24x7.
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