What does a collet do in machining?

A collet functions primarily as a tool holder that grips and secures either a cutting tool or a workpiece in place during machining operations. It is designed to provide a precise and stable clamping force that minimizes vibration and ensures consistent performance in various machining tasks, such as milling, drilling, or grinding.

The design of a collet incorporates a series of slots that allow it to contract when a tapered shape or nut is tightened, providing a firm grip on the tool or workpiece. This ability to create a strong clamping force is essential for achieving accurate cuts and maintaining the integrity of the machining process. As a result, collets are widely used in CNC machines, lathes, and milling machines.

While other options mention functions related to machining, they do not define the primary role of a collet as effectively as the correct answer. For instance, holding a workpiece during drilling is a function more related to vises or other fixtures rather than the specific function of a collet. Similarly, routing coolant or supporting the tool head are distinct tasks not associated with the collet's primary purpose. Thus, the correct answer highlights the essential role of the collet in maintaining stability and precision during machining operations.