Correct Answer - Option 1 : Punched tape
Concept:
In Numerical Control machine, programmed instructions are stored in Punched tape (in the computer memory) control automatic machine tools, while in Computer Numerical Control there is a more advanced system incorporating a detailed minicomputer or microcomputer to control the individual machine tools connected to a central computer that supplies the instructions.
Numerical control is composed of four basic elements:
- An input interface that transforms signals into power levels that are suitable for logic devices in the control system.
- Some form of instructions, or logic to be given to the machine.
- Memory, which allows a machine to perform a sequence of operations to know what and when to proceed to the next step.
- An output interface which changes the signals for machine actions to takes place.
