Component of a CNC mill that reads part programs to direct machine movements.

Component of a CNC mill that reads part programs to direct machine movements.

• A. Machine control unit
• B. Servo amplifier
• C. Operator console
• D. Drive motor

Answer: (A)

The machine control unit is the brain of a CNC mill: it reads the part program (like G-code), interprets each instruction, and generates the precise sequence of movements for all axes, along with spindle speed, tool changes, and feed rates. It coordinates timing and motion so multiple axes move in sync, and it handles look-ahead and error checking to ensure the program runs correctly. The servo amplifiers provide the power and control signals to the drive motors but don’t read or interpret the program themselves. The drive motors are the actuators that produce motion. The operator console is the user interface for programming and monitoring, not the component that directs movements.

The machine control unit is the brain of a CNC mill: it reads the part program (like G-code), interprets each instruction, and generates the precise sequence of movements for all axes, along with spindle speed, tool changes, and feed rates. It coordinates timing and motion so multiple axes move in sync, and it handles look-ahead and error checking to ensure the program runs correctly. The servo amplifiers provide the power and control signals to the drive motors but don’t read or interpret the program themselves. The drive motors are the actuators that produce motion. The operator console is the user interface for programming and monitoring, not the component that directs movements.