Cutting by use of rotating axially moving tool – Tool or tool with support – Having peripherally spaced cutting edges
Patent
1995-04-11
1997-04-22
Bishop, Steven C.
Cutting by use of rotating axially moving tool
Tool or tool with support
Having peripherally spaced cutting edges
408715, B23B 5102
Patent
active
056224621
ABSTRACT:
A drill bit is provided with a pair of spiral cutting blades having opposed cutting edges which come together at an angle to form a starting tip. Each of the spiral cutting blades includes a spiral flute which extends longitudinally thereof and is provided with a cutting face thereon. Each cutting edge is provided with an inner edge segment and an outer edge segment wherein the inner edge segment extends outwardly from the starting tip a preselected distance and terminates at an inwardly extending inner wall portion of a gullet. The inner wall portion of the gullet is arcuate in structure and terminates at a preselected inward position with an outer wall of the gullet. The outer wall of the gullet extends angularly outwardly terminating at the intersection with an outer segment of the cutting edge. The outer edge segment of the cutting edge is defined by the outward terminating end of the outer wall of the gullet and the outer most extremity of the cutting edge.
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Brutscher David T.
Gakhar Ved
McCord, Jr. Wilfred M.
Bishop Steven C.
Credo Tool Company
Lamb Charles G.
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