What is the purpose of a spindle in a CNC cutting machine?

The spindle's primary role in a CNC cutting machine is to hold and rotate the cutting tool at high speeds. It is a crucial component that enables the cutting tool to perform its function efficiently by providing the necessary rotational energy. This rotation allows for precise and controlled cutting actions, leading to accurate machining of materials.

High-speed rotation is essential in CNC machining because it allows for smoother cuts, reduces machining time, and improves the overall quality of the finished product. The design of the spindle affects the machine's capability to handle different types of cutting tools and materials, making it a vital element in the performance of the CNC machine.

Other options, while relevant to different aspects of CNC machining, do not describe the spindle's function. Providing cooling to the cutting tool is typically handled by a separate system, like a coolant supply. Stabilizing the workpiece may involve fixtures or clamps rather than the spindle itself. Similarly, controlling the feed rate is a function of the machine's motion system, not the spindle. Thus, the spindle's main responsibility is indeed to hold and rotate the cutting tool, making option A the correct answer.