Cutting by use of rotating axially moving tool – Tool or tool with support – Having peripherally spaced cutting edges
Patent
1985-11-08
1988-07-26
Weidenfeld, Gil
Cutting by use of rotating axially moving tool
Tool or tool with support
Having peripherally spaced cutting edges
408227, B23B 5102
Patent
active
047596678
ABSTRACT:
A four surface point type drill has its primary clearance faces configured so that their circumferential width decreases as the longitudinal axis of the drill is approached. The trailing edge and cutting edge of the primary clearance face surfaces substantially intersect each other at a point where they both intersect the opposite ends of the chisel edge of the drill point. The chisel edge itself is totally defined by a line formed by the intersection of the two secondary clearance face surfaces of the drill point. This new improved drill point geometry permits the use of reduced primary and secondary clearance face relief angles at the drill point which improves the structural integrity of the cutting edge of the drill and hence reduces chipping at the cutting edge.
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American Telephone and Telegraph Company, AT&T Technologies, Inc
Howell Daniel W.
Steinmetz Alfred G.
Weidenfeld Gil
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