TWO-EDGE DOUBLE MARGIN DRILL
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United States of America Patent
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Issued Date -
Oct 8, 2015
app pub date -
Oct 8, 2013
filing date -
Oct 30, 2012
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Abstract
The problem of making it possible to shorten as much as possible the distance from a major margin to a minor margin of a two-edge double margin drill in an axial direction is addressed. An interval between major margins and respective minor margins, which are provided at outer peripheries of lands, are set at 80° to 100°, flank faces both include a flat second flank face and a flat third flank face, web thinning portions including web thinning surfaces having convex arcs in a direction of drill rotation in front view of the drill are formed at a central portion of an end, and an outer end of each web thinning surface in a radial direction is disposed behind an end of the corresponding minor margin in the direction of drill rotation and extends to the outer periphery of the corresponding land.
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