Drill

Details Drill Drill

1983-06-06

1985-12-31

Weidenfeld, Gil

Cutting by use of rotating axially moving tool

Tool or tool with support

Having peripherally spaced cutting edges

408228, B23B 5102

Patent

active

045618135

ABSTRACT:
The drill invention relates to forming holes in circuit boards and the like. Smoother holes may be formed faster by reducing tendencies of drills to chip. The drill (11) employs primary and secondary reliefs (28,29) behind cutting lips (27) to provide lesser and greater clearances, thereby strengthening the cutting lips' outer edges. The margins (10) having lengths variable in width (20,21) and variable in helix angle (22,23) facilitate the foregoing.

REFERENCES:
patent: 2817983 (1957-12-01), Mossberg
patent: 2897695 (1959-08-01), Winslow
patent: 2903921 (1959-09-01), Andreasson
patent: 2936658 (1960-05-01), Riley
patent: 3387511 (1968-06-01), Ackart, Sr. et al.
patent: 3400617 (1968-09-01), Sanborn
patent: 3778180 (1973-12-01), Ostrom
patent: 3933075 (1976-01-01), Peterson
patent: 4065224 (1977-12-01), Siddall
patent: 4080093 (1978-03-01), Maier
patent: 4116580 (1978-09-01), Hall et al.
patent: 4222690 (1980-09-01), Hosoi
patent: 4231692 (1980-11-01), Brabetz
patent: 4286677 (1981-09-01), Guex
Megatool-"Point Geometry Specifications", sheet.
Metal Cutting Tool Institute-"Metal Cutting Tool Handbook", Sixth Edition (1969).

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