Apparatus and method for machining an enveloping-type worm...

Details Apparatus and method for machining an enveloping-type worm... Apparatus and method for machining an enveloping-type worm...

B - Operations, Transporting

23

F

10/29

B23F 13/06 (2006.01) B23F 15/00 (2006.01)

Patent

CA 1264902

ABSTRACT OF THE DISCLOSURE A method and apparatus are disclosed for machining hourglass screw threads on an enveloping-type worm screw by engaging at least one angularly positioned cutter with a screw blank having an hourglass shape. The screw blank is rotated about its central longitudinal axis at the same time that each angularly positioned cutter is pivoted through the screw blank at a rate which is less than the rate of rotation of the screw blank.

476459

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