Twist drill

Cutting by use of rotating axially moving tool – Tool or tool with support – Having peripherally spaced cutting edges

Patent

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Details

408223, B23B 5102

Patent

active

044001193

ABSTRACT:
An improved twist drill (20) is provided which includes at least one spiral groove (42) which extends from the leading face of a cutting edge of a tip portion of the drill. This groove is positioned at a spaced location from the cutting lip (40) and extends to the trailing face of the cutting blade tip such that a portion of the material to be drilled initially passes through the spiral groove during the drilling operation as the drill is fed into the work piece. The portion of the material which passes through the groove is at least partially cut by a subsequent pass of the cutting edge of the further cutting blade tip and causes shavings of the material to be broken into smaller sizes thereby enhancing the travel of the shavings along the length of the flutes and reducing the binding forces applied to the twist drill during drilling operations.

REFERENCES:
patent: 2576664 (1951-11-01), Berlien
patent: 2646701 (1953-07-01), Letien
patent: 2667795 (1954-02-01), Bowen
patent: 3237488 (1966-03-01), Parone et al.
patent: 3765789 (1973-10-01), Hougen
patent: 3824026 (1974-07-01), Gaskins
patent: 3977807 (1976-08-01), Siddall
patent: 4231692 (1980-11-01), Brabetz et al.

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