A workholding device secures cutting tools or workpieces within a milling machine spindle. Typically cylindrical, this device utilizes a clamping mechanism, often a tapered bore with slits, to tightly grip the tool shank or workpiece. For instance, end mills, drills, and router bits are common tools held by these devices. The clamping action is achieved by tightening a drawbar, which pulls the device inward, constricting the slits and creating a firm grip.
Precise and secure tool holding is essential for accurate machining operations. This device offers high runout accuracy, minimizing vibrations and improving surface finish quality. This inherent accuracy allows for faster cutting speeds and extended tool life. The development of these devices was instrumental in advancing milling machine technology, enabling greater precision and the efficient use of a wider variety of cutting tools.
