Eliminating hinged drill caps

Details Eliminating hinged drill caps Eliminating hinged drill caps

1995-07-05

1997-01-14

Bishop, Steven C.

Cutting by use of rotating axially moving tool

Processes

Bit detachable

408 61, 408 67, B23B 3500

Patent

active

055932568

ABSTRACT:
A method of through-hole drilling of metal workpieces having sufficient ductility to create hinged drill caps, which comprises: while carrying out through-hole drilling with low thrust drill tips, directing a fluid jet stream against the drill exit side of the workpiece with sufficient force to retain and resulting drill cap closed against the exit side until such drill cap is completely annularly severed from the workpiece, the jet stream being oriented substantially coincident with the revolving axis of the drill. The fluid of the jet stream may be a machining liquid coolant, a gas, or a water-based solution. The jet stream has a diameter upon impingement with the workpiece that is less than the diameter of the exit opening created by the drill.

REFERENCES:
patent: 1448507 (1923-03-01), Stueber
patent: 2154793 (1939-04-01), Weber
patent: 2272271 (1942-02-01), Mallory
patent: 2989046 (1961-06-01), Zimmerman
patent: 3781124 (1973-12-01), Bodycomb
patent: 5148728 (1992-09-01), Mazurkiewicz

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