Cutting by use of rotating axially moving tool – Processes – Bit detachable
Patent
1995-08-09
1997-05-06
Bishop, Steven C.
Cutting by use of rotating axially moving tool
Processes
Bit detachable
144219, 407 54, 408 21, 408223, 408227, B23B 5108, B23C 510
Patent
active
056264461
ABSTRACT:
A flat drill bit having a shaft with an axis of rotation and a flat drill bit head connected to the shaft. The flat drill bit head includes opposing flat front and back faces, left and right edgewalls between the front and back faces, and a bottom endwall connected to the left and right edgewalls. The left and right edgewalls are angled relative to the front and back faces so as to define left and right cutting edges that are parallel to the axis of rotation. The bottom endwall includes left and right sections, each being angled in opposite directions relative to the front and back faces so as to define left and right bottom cutting edges. The bottom endwall of the drill bit head has a rounded shape thereby providing curved left and right bottom cutting edges. In an alternate embodiment the bottom endwall is generally straight, thereby providing straight left and right bottom cutting edges.
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