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What is Whirling?
Whirling removes material similarly to milling; however, in whirling the carbide cutters are arranged along the inside of a ring to a predetermined cutting circle diameter calculated from the thread data. (Outer Diameter, Pitch, Lead, etc.)
The whirling head is tilted to the nominal helix angle of the worm. Material removal is the result of the whirling ring rotating at high speed around a slowly rotating workpiece. The rotating workpiece combined with the advancement of the longitudinal slide produces the required pitch of the thread.
The tangential cutting action of the whirling process leaves the tool in contact with the workpiece for a much longer time along the arc of the “cutting circle” of the inserts.
Thread whirling process:
Five movements willl be finished when the whirling process: