Burnishing drill
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United States of America Patent
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-
Dec 10, 1991
Issued Date -
N/A
app pub date -
Aug 1, 1990
filing date -
Jan 24, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A burnishing drill includes a cylindrical drill body connected at its forward end integrally with a shank. The forward end of the drill body includes a first pair of cutting edges inclined radially and rearwardly from the forwardmost central end of the drill body toward the shank at a first cutting angle. A second pair of cutting edges formed of diamond chips are disposed in a plane intersecting the plane in which the first pair of cutting edges are located. The second pair of cutting edges are inclined radially and rearwardly from a position inside a circle including the maximum external margins of the first pair of cutting edges toward the shank at a second cutting angle.
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