Drill
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United States of America Patent
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Feb 27, 2018
Issued Date -
N/A
app pub date -
Aug 20, 2014
filing date -
Aug 22, 2013
priority date (Note) -
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Abstract
Provided is a drill suitable for high-efficiency working. A cut debris discharge groove is formed in the outer periphery of the drill body front end section rotated about the axis, and a cutting edge is formed at the front end of the drill body. The wall surface of the cut debris discharge groove, which faces the rotational direction of the drill, is formed to have a concave curve line shape in a cross-section perpendicular to the axis, the concave curve line shape extending along a first circular arc.
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