Method of drilling ductile materials

Details Method of drilling ductile materials Method of drilling ductile materials

1995-01-25

1996-10-15

Howell, Daniel W.

Cutting by use of rotating axially moving tool

Processes

Bit detachable

408 17, B23B 3500

Patent

active

055648690

ABSTRACT:
A method of drilling ductile materials with split-point drills includes the steps of placing a split-point drill above a ductile material having an entrance side, drilling a hole in the ductile material with the split-point drill from the entrance side to an exit side thereof, breaking through a surface of the exit side with the split-point drill a first predetermined distance to form a drill cap, retracting the split-point drill a second predetermined distance, and accelerating the split-point drill through the surface of the exit side to remove the drill cap from the ductile material.

REFERENCES:
patent: 2669889 (1954-02-01), Huller
patent: 2989046 (1961-06-01), Zimmerman
patent: 4269549 (1981-05-01), Block
patent: 4480952 (1984-11-01), Jeremias
patent: 5139376 (1992-08-01), Pumphrey
patent: 5158405 (1992-10-01), Serafin
patent: 5247862 (1993-09-01), Haack

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