These precision workholding devices securely grip cutting tools within a milling machine’s spindle. A cylindrical tool shank is inserted into the tapered bore of the device, which, when tightened, contracts radially, providing a firm, accurate grip. Common materials include hardened steel, high-speed steel, and carbide.
Accurate tool holding is essential for producing high-quality milled components. These devices offer several advantages including high runout accuracy, which minimizes vibration and improves surface finish, and rapid tool changes, contributing to increased productivity. Historically, advancements in their design and materials have mirrored advancements in machining technology, allowing for higher speeds, feeds, and greater precision overall. Their role has become even more crucial with the increasing prevalence of automated machining centers.
