With neat sketch explain the working principle of CNC machines.

With neat sketch explain the working principle of CNC machines. 
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Answer :

Working Principle of CNC machine:-

A CNC machine also has a tape reader or any other input media for entry of the part program. CNC uses the part program in a different manner though there is similarity between NC and CNC. In CNC, entire program is first fed to the inbuilt computer memory. Once the program is stored, the machine cycle is then executed by the program. Software with control algorithms converts the part program instructions into actions by the machine tool. This is done by generating pulses for each axis from the controller. Each pulse produces one small unit of motion (SUM). The slide travel is thus decided by the number of pulses. In a closed loop system, the pulses are fed to a reference. The feedback device also sends the signal to the reference. These two signals are compared and necessary action is controlled.

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