What part of a CNC system reads and executes the machining instructions in the part program?

What part of a CNC system reads and executes the machining instructions in the part program?

• A. Spindle
• B. Machine Control Unit
• C. Servo Motor
• D. Controller

Answer: (B)

The Machine Control Unit is the brain of a CNC system. It reads the part program (like G-code), interprets each instruction, and coordinates the machine’s actions to execute the toolpath. It translates the program into specific commands for the servo drives to move the axes at the correct positions and feeds, and it also controls spindle speed, tool changes, and other functions as dictated by the program. The spindle simply rotates the cutting tool, and the servo motors are the actual actuators that move the machine parts, but they rely on the control unit to tell them what to do. The term “controller” can refer to the overall control system, but in this context the component that reads and executes the instructions is the Machine Control Unit.

The Machine Control Unit is the brain of a CNC system. It reads the part program (like G-code), interprets each instruction, and coordinates the machine’s actions to execute the toolpath. It translates the program into specific commands for the servo drives to move the axes at the correct positions and feeds, and it also controls spindle speed, tool changes, and other functions as dictated by the program.

The spindle simply rotates the cutting tool, and the servo motors are the actual actuators that move the machine parts, but they rely on the control unit to tell them what to do. The term “controller” can refer to the overall control system, but in this context the component that reads and executes the instructions is the Machine Control Unit.