Which machine part holds the cutting tool on a milling machine?

The spindle is the machine part that holds the cutting tool on a milling machine. It is designed to rotate the cutting tool at high speeds while the workpiece is held securely in place on the work table. The spindle provides the necessary precision and stability required for effective metal cutting.

In a milling machine, the spindle's role is critical as it directly influences the cutting performance. It must be robust enough to withstand the forces generated during the cutting process while maintaining the correct alignment for accurate machining. Other components, such as the work table and bed, serve different functions; the work table holds the workpiece and allows for movement along axes, while the bed supports the overall structure and provides rigidity. The gearbox, in contrast, is involved in transferring power and controlling the speed of the spindle but does not hold the cutting tool itself.