What is the purpose of a tool holder in machining?

A tool holder serves a critical role in machining by securely holding the cutting tool in position during the machining process. It ensures stability and alignment of the tool, which is essential for accurate cutting and shaping of materials. A secure tool holder prevents any movement of the tool that could lead to inaccuracies, vibrations, or potential damage to both the tool and the workpiece. Properly secured tools also contribute to better surface finishes and precision in the final product.

In contrast, measuring dimensional accuracy pertains to gauging the finished dimensions of a workpiece, which is not the function of a tool holder. The addition of lubrication, while important in machining to reduce friction and wear, is not a task performed by the tool holder itself. Furthermore, the concept of providing additional cutting power relates to enhancements in machine capability or tool design, which is separate from the primary role of the tool holder in securing the tool.