Printed circuit drill

Details Printed circuit drill Printed circuit drill

1974-07-15

1976-03-30

Weidenfeld, Gil

Cutting by use of rotating axially moving tool

Tool or tool with support

Having peripherally spaced cutting edges

408226, B23B 5102

Patent

active

039471438

ABSTRACT:
A twist drill comprising a bit containing spirally arranged grooves and lands of substantially equal width, with a shank at one end and a pointed tip at the other, the leading edges of the grooves being inclined to the axis of the bit and constituting cutting edges and the lands rearwardly of the cutting edges being relieved, characterized in that there are auxiliary rectilinearly arranged axially spaced cutting edges parallel to the axis of the bit formed by straight line channels spaced peripherally about the axis of the bit but of lesser depth than the spirally arranged grooves.

REFERENCES:
patent: 3058199 (1962-10-01), Cave et al.
patent: 3667857 (1972-06-01), Shaner et al.
patent: 3778180 (1973-12-01), Ostrom

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