Twist drills

Details Twist drills Twist drills

1975-05-27

1976-08-31

Simpson, Othell M.

Cutting by use of rotating axially moving tool

Tool or tool with support

Having stepped cutting edges

408230, B23B 5102

Patent

active

039778070

ABSTRACT:
A twist drill having primary lands and associated secondary lands the primary lands being relieved adjacent the major flanks so that each secondary land protrudes outwardly and forms a sizing flank for taking a "skimming" cut. The primary lands may be relieved either by being chamfered off at an angle or by the diameter across said primary lands being reduced for a limited distance from the major flanks.

REFERENCES:
patent: 395459 (1889-01-01), Shields
patent: 750537 (1904-01-01), Hanson
patent: 2389909 (1945-11-01), Hotbauer
patent: 2479136 (1949-08-01), Schade

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