Process to cut hour glass screws

Details Process to cut hour glass screws Process to cut hour glass screws

1991-04-11

1992-02-04

Briggs, William

Metal working

Method of mechanical manufacture

Impeller making

409 48, B23F 1508

Patent

active

050849654

ABSTRACT:
Method and device for grooving an hourglass screw wherein a tool shaft having an axis transverse to the screw blank has a tool movable selectively stepwise relative to the shaft when the tool is not engaged with the screw blank and locking means fix the tool when engaged with the screw blank for the grooving operation.

REFERENCES:
patent: 2603412 (1952-07-01), Chilton
patent: 4034645 (1977-07-01), Keijer

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