In the control system of a CNC machinist's machine, it must be sequenced by code in order to perform CNC machining. In precision machining, the program must be entered into the machine's control system via a keyboard (keypad) or tape (cassette). When the system reads the input, it will be driven by the CNC machine drive motors (feed motors) to move the slider. Examples include a CNC lathe with two motors or a CNC milling machine with three motors.
In CNC machining process, the control system converts the code into electrical signals and then controls the motor operation. However, since the signal of the system is low power rotary motor drive as discontinuous operation. That is why it is necessary to send signals to the amplifier. CNC machinist's system drive amplifies and then sends the signals for precision machining to the motor and the horizontal axis, which is programmed to move.
The speed and distance of the moving stage needs to be set manually by the precision machining operator as it is not visible to the CNC machining control system. When setting up the machine, the operator needs to observe the edge of the workpiece and the platform position by eye, which is prone to errors. Therefore, CNC machinists need a tool that can tell the control system the position of the platform and the position of the horizontal axis. This device is called a measuring system, which consists of a vertical scale (linear scale) and the same number of axial movement cores. It sends an electrical signal corresponding to the distance of the moving platform, so that the controller system knows the distance.
