b'Advantages of Thread Whirling According to GenSwiss, thread whirling offers advantagesFaster setup. By eliminating the need to match rough over single-point threading, including: and finish insert forms, thread whirling reduces setup and Deep threads. Bone screws usually have a deep threaddebugging time.formation, like Acme forms and other increased-pitch threads,Increased productivity. Thread whirling usually is which can be machined in less time by whirling. performed in a single pass from stock diameter. By eliminating Long-length-to-diameter threads. On a Swiss-type machine,unnecessary support devices and multiple thread passes, a a thread whirling spindle works close to the guide bushingcycle can be reduced by minutes.for increased support and rigidity on long-length-to-diameterGreater tool life. Whirling inserts have a stronger cutting screws. edge than single-point tools.Give Threading a Whirl pattern. full tangency of the cutting path.With thread whirling, the cutter enters and exits in a radial arc, whichBest Practicesentry and exit of the cutter, whichis similar to the thread radius direc- Loughney said getting thread leaves a uniform pattern. tion. As the heel of the insert exitswhirling right from the beginning, With thread milling, the tool cutsthe thread form, the resulting fin- setting up and understanding how on the way into the material and upish leaves a crosshatch pattern. Butthe thread whirling unit works on to the full tangent point. As the heelthis pattern would not be seen ona machine are critical for first-time of the cutter makes an exit path,any thread wall with a positive wallusers.the direction of the finish patternangle. That is because the cutterMany thread whirling units have changes and results in a crosshatchcontacts the workpiece only at thea 50-1 gearbox reduction, he said. Take this into consideration that the programmed rpm will not be HIGH-SPEED LASER MACHINING OF PCD TOOLS the actual output in most cases.Rollomatic LaserSmart510 - monoblock, round-shank tools, inserts Standard inserts for thread whirl-ing HA and HB thread forms are ChipRazor-sharpavailableasstockeditemsfrom breakercutting edges Sandvik Coromant. These threads machining have the specific dimensions and tol-erances needed for bone screws and other medical implants. However, the majority of thread forms on bone screws are special forms that would Programmablebe offered as engineered solutions.dened cuttingAswitheverythingelsefora edge Swiss-style CNC machine, Laprade Offset- contributorsindependentCylindricalprocess Carmex Precision Tools LLC margins 855-463-5509www.carmexusa.comGenevieve Swiss Industries Inc.413-562-4800www.genswiss.comSandvik Coromant Co.RollomaticUsa.com 800-726-3845www.sandvik.coromant.com44JULY 2021Threading.indd 44 6/17/21 11:30 AM'