B - Operations – Transporting – 23 – B
Patent
B - Operations, Transporting
23
B
77/30
B23B 51/00 (2006.01)
Patent
CA 1210970
BALANCED DRILL WITH CENTER CUTTING ACTION ABSTRACT OF THE DISCLOSURE A drill is provided having opposed primary and Secondary cutting edges. The primary cutting is disposed at an angle less than ninety degrees 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 end of the primary cutting edge nearest the longitudinal axis leads the drill into a workpiece. 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 gene- rate substantially balanced forces about the longi- tudinal axis of the drill. Flutes extend from each cut- ting edge for efficient and reliable removal of chips.
444023
Haque Sazzadul
Schroeder Terry A.
Company General Electric
Eckersley Raymond A.
LandOfFree
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