(iii) Machine Tool: A CNC machine tool always has a slide table and a spindle to control of the position and speed. It implements the auxiliary control functions such as coolant or spindle on/off and tool change.It receives the feedback signals of position and speed for each drive axis.It feeds the axis motion commands to the amplifier circuits for driving the axis mechanisms.It implements interpolation ( linear, circular and helical ) to generate axis motion commands.It reads the coded instructions fed into it.It performs all the controlling action of the CNC machine, the various functions performed by the MCU are (ii) Machine Control Unit (MCU): It is the heart of the CNC machine.
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