What is essential for controlling the speed and precision of a FANUC CNC machine?

The correct answer is focused on the role of servo motors in a FANUC CNC machine's operation. Servo motors are critical components that ensure high precision and control over the movement of the machine. They provide the necessary feedback and control mechanisms that allow the machine to achieve accurate positioning and speed adjustments.

Servo motors adjust the rotation and speed of machine axes by receiving commands from the CNC controller, based on the programmed instructions. This interaction is essential in applications requiring precise movements, such as contour machining or complex part creation, where even minor deviations can compromise quality.

In contrast, while linear actuators are important for converting rotational motion into linear motion, they do not inherently provide the level of precision and control that servo motors do. Pneumatic systems can be used for certain applications but are generally less precise than electric systems and primarily rely on air pressure rather than electrical feedback and control. Likewise, electric brakes may serve functions related to stopping and holding movements but are not directly involved in the ongoing control of speed and precision of the movements themselves.

Overall, servo motors' capability for fine-tuned control makes them indispensable in the operation of FANUC CNC machines.