CNC control have divided into two parts.

1. Control Movement (Movement).

2. Control the speed of movement (Speed).

     The working principle of the CNC.

       CNC (CNC Machine) controls the input of a computer keyboard / keyboard (Key Board) or magnetic tape (Magnetic Tape) when the system reads the program. And data to control the operation of machinery. By entering motor (Feed Motor) so that instead of sliding motion commands such as CNC.There are two motor movement for CNC milling machine. 3 moteres to enter the motor control system reads the program and change program code into electrical signals for motor control. But because the signal from this control system are weak. Unable to rotate the drive motor running. The signals through the amplifier of the system drive (Drive Amplified) and send signals to the motor input axis defined by the program speed ​​and distance. The sliding motion of the platform is programmed in advance to control the CNC machine and equipment that monitors the position of the sliding platform control system called Measure (Measuring System), Which consists of a linear scale (Liner Scale) are equal to the amount of axial movement of the machine. That transmits electrical signals corresponding to the distance the mobile platform sliding back to the control system.

         From this special feature CNC machine can produce a shape according to a size and shape that we want. As the construction and operation, superior general machinery. As a result, CNC is one factor that is very important nowadays. For produce a large amount and reduce the number of its production period.