Flat bottom hole drill

Details Flat bottom hole drill Flat bottom hole drill

B - Operations, Transporting

23

B

77/35

B23B 51/02 (2006.01)

Patent

CA 1199509

FLAT BOTTOM HOLE DRILL ABSTRACT OF THE DISCLOSURE 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 of 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 longi- tudinal axis of the drill. Flutes extend from each cutting edge for efficient and reliable removal of chips.

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