Answer Posted / k.satyanarayana

Numerical control is a system in which the actions are
controlled by the direct insertion of numerical data at one
point and the system must be in a position to interprete at
least a part of this data.

This is the defintion given by Electroni Industries
Association.

In numerical control the programme is fed to the machine by
means of a punch tape and this punch tape has to be
recycled for each product of that batch. It does't have any
memory.

Where as in CNC (computer numerical control), the machine
is usually having an on board control with memory to store
the programme. In this also, the programme will be entered
by means of punched tape but the punched tape need not be
recycled for each product in the batch.

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