High Precision Thread Whirling with CoroMill 325 — Sandvik Coromant

The growing use of medical bone screws, implants and other micro-components creates a need for techniques that produce special thread forms quickly and at high tolerances. Thread whirling neutralizes many of the issues encountered with single-point threading. The process is used primarily by medical manufacturers to produce bone screws with deep threads on Swiss turning centers. The CoroMill 325 uses a differential pitch insert layout. Rather than being spaced evenly apart, inserts in the pocket are positioned at varied locations, eliminating chatter. The inserts feature sharp edges and a hard composition, resulting in improved part quality and tool life.