Metal tools and implements – making – Blank or process – Drill
Patent
1992-09-30
1995-08-22
Howell, Daniel W.
Metal tools and implements, making
Blank or process
Drill
408224, 408230, B23B 5102
Patent
active
054429790
ABSTRACT:
A twist drill having a longitudinal axis, a shank portion sized and shaped to be grasped by a twisting tool, and a barrel portion for cutting a workpiece. The barrel portion has a number of flutes formed therein spiraling about the axis and terminating at a point end of the barrel portion. The point end has a number of point surfaces including an inner flank surface, an outer flank surface, a groove surface positioned between the inner and outer flank surfaces and a split surface. The inner flank surface extends from the center of the point end to the inner extent of the groove surface and the outer flank surface extends from the outer diameter of the point end to the outer extent of the groove surface.
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Greenfield Industries, Inc.
Howell Daniel W.
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