Smith, Gambrell & Russell, LLP
Drill and method of manufacturing drill
According to one implementation, a drill has at least one cutting edge. A projected shape of a passing area of a ridgeline of the at least one cutting edge when the at least one cutting edge is rotated around a tool axis becomes a line-symmetric and discontinuous line along a parabola, two parabolas, an ellipse or two ellipses. The projected shape is drawn on a projection plane parallel to the tool axis.
SUBARU CORPORATION
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Hideharu Masao Toshio Manabu Tatsuo
Takahashi Watanabe Nishino Saito Nakahata