Cutting by use of rotating axially moving tool – Tool or tool with support – Having stepped cutting edges
Patent
1985-05-21
1986-11-04
Briggs, William R.
Cutting by use of rotating axially moving tool
Tool or tool with support
Having stepped cutting edges
408223, 408230, B23B 5100
Patent
active
046208224
ABSTRACT:
A drill is provided having opposed primary and secondary cutting edges extending perpendicular to the longitudinal axis of the drill. The primary cutting edge extends across the longitudinal axis of the drill to a terminus intermediate the longitudinal axis and the periphery of the drill. The secondary cutting edge extends inwardly from the periphery of the drill to a point intermediate the periphery and the longitudinal axis of the drill. The primary and secondary cutting edges are spaced from one another along the longitudinal axis so that the primary cutting edge leads the secondary cutting edge during a drilling operation. The primary cutting edge drills the inner part of the hole and the secondary cutting edge drills the outer part of the hole. The primary and secondary cutting edges are designed to generate substantially balanced forces about the longitudinal axis of the drill. Flutes extend from each cutting edge for efficient and reliable removal of chips.
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patent: 4248555 (1981-02-01), Satou
Haque Sazzadul
Schroeder Terry A.
Briggs William R.
General Electric Company
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