High-speed gun drill

Details High-speed gun drill High-speed gun drill

1999-01-21

2000-04-04

Howell, Daniel W.

Cutting by use of rotating axially moving tool

Tool or tool with support

408227, 408705, B32B 5100

Patent

active

060453044

ABSTRACT:
A gun drill having a reversed taper approximately ten times greater than the conventional drills, or approximately 0.3 mm per 100 mm, between a tip of the cutting edge and a point some distance away therefrom is provided. The gun drills deep holes at high speed and with sufficient exactness by preventing the peripheral surface of the gun drill from coming into contact with the inner surface of the hole being drilled.

REFERENCES:
patent: 1513350 (1924-10-01), Stolle
patent: 2674908 (1954-04-01), Willingham
patent: 2739496 (1956-03-01), Fleischer
Tool and Manufacturing Engineers Handbook, Fourth Edition, vol. 1, Machining, Thomas J. Drozda, Society of Manufactuing Engineers, 1983, Chapter 9, pp. 54 and 55.

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