Symmetrical spur point drill

Details Symmetrical spur point drill Symmetrical spur point drill

1979-06-14

1981-08-25

Briggs, William R.

Cutting by use of rotating axially moving tool

Tool or tool with support

Having inversely angled cutting edge

408213, 408211, B23B 5104

Patent

active

042856205

ABSTRACT:
A drill for use on reinforced composite parts comprising a two fluted marginless drill body with four forward cutting edges, said edges first scribing a hole in the composite and then cutting the plug from the circumference of the hole inward to the axis of the hole.

REFERENCES:
patent: 283040 (1883-08-01), Swan
patent: 796321 (1905-08-01), Granberg
patent: 1966176 (1934-07-01), Knapp
patent: 2114668 (1938-04-01), Moler
patent: 2535398 (1950-12-01), Economous
patent: 2556745 (1951-06-01), Zimmerman
patent: 2675841 (1954-04-01), Einhiple
patent: 2792862 (1957-05-01), Emmons
patent: 2936804 (1960-05-01), Kallid
patent: 3130763 (1964-04-01), Schlosser et al.
patent: 3824026 (1974-07-01), Gaskins
"Cutting Fabric, Prepreg & Composites of Kevar Aramid", Memo No. 348, Textile Fibers Dept., Du Pont Inc., 9-19-75.

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