b'said thread whirling depends on the guide bushing for support, so ensuring that cutters are as close as possible is paramount, especially for smaller-diameter threads.To help accommodate that, he said, shifted cutter rings that bring the inserts closer to the guide bush-ing are available for more readily available live tooling attachments on the market.Genevieve Swiss IndustriesA model of a double-lead thread form whirling insert with a lead angle relief is displayed.Recent AdvancementsOne of the most recent improve-ments for thread whirling has been cutter rings that are capable of de-livering high-pressure cutting oil di-rectly to threading inserts to better clear chips, as well as cool the cut-ting edges.Previously, Laprade said, this had been accomplished through external cooling lines that had to be manually adjusted for each setup and (were) time-consuming.Another recent advance is quick-change capability. Sandvik Coro-mant provides that with its whirling rings, along with high-quality carbide and coatings, such as Grade GC1105, which Loughney said is a popular choice for medical machining.Grade GC1105 offers sharper edges for burr-free component sur-faces and long and predictable tool life, he said. This is especially im-portant when machining titanium and stainless steel bone screws. CTEctemag.com/cteguide.com45Threading.indd 45 6/17/21 11:30 AM'