Drill and sharpening fixture

Details Drill and sharpening fixture Drill and sharpening fixture

1998-04-17

2000-02-29

Howell, Daniel W.

Cutting by use of rotating axially moving tool

Tool of specific diverse material

408199, 408211, 408223, 408229, B23B 5102

Patent

active

060301562

ABSTRACT:
A single point drill particularly adapted to producing small diameter deep holes utilizing a peck feed cycle routine. The preferred embodiment features a limited flute length with a depth approximately 1/3 the drill diameter and a dual point edge consisting of a shallow cutting angle and a steep relief angle. A negative rake angle runs along this edge functioning as a knife edge that will cut on opposite rotation, countering the unbalanced forces inherent in a single point tool. A sharpening fixture consisting of 2 parallel slates secured with a T-headed bolt and an anti-rotation pin. The lower plate features a central groove to locate the drill, the upper plate having a short land that facilitates orienting and clamping the drill flute. The forward end of the fixture mimics the drill point allowing the drill to be sharpened on a grinder table or by hand with a suitable abrasive stone or file.

REFERENCES:
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patent: 2977828 (1961-04-01), Strickland
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patent: 4605347 (1986-08-01), Jodock et al.
patent: 5597273 (1997-01-01), Hirsch
patent: 5665914 (1997-09-01), Taniguchi

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