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US 6,585,460 B1Granted
Drill having machine grindable cutting edge
AssigneeGeneral Electric Company
InventorsRoy D. Meece, James A. Baird, Jr., Gerald R. Geverdt
Life of this patent
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AssigneeGeneral Electric Company
InventorsRoy D. Meece, James A. Baird, Jr., Gerald R. Geverdt
Estimating the term…
A drill having a cutting edge that is less prone to chipping or fracturing when used in drilling operations, and that can be sharpened or resharpened uniformly and consistently from drill to drill by machine grinding. The drill comprises a body and at least one flute formed in the body that terminates in a cutting edge at the cutting end of the drill. The flute has a cutting surface, the cutting surface having formed therein a dub face having a substantially planar surface over at least a portion thereof that is proximate to the cutting edge. The cutting edge has formed therein a cutting land having a substantially planar surface over at least a portion thereof connected at an edge to the planar surface portion of the dub face.
A drill having a cutting end, the drill comprising:
A method for machine grinding the cutting end of a drill, the drill comprising a body and at least one flute formed in the body, the method comprising the steps of:
The method of 14 wherein the cutting edge is machine ground during step (b) to form the planar surface portion of the cutting land so as to have a negative axial rake angle of from about 20 to about 40°.
The method of 16 wherein the cutting edge is machine ground during step (b) to form the planar surface portion of the cutting land so as to have a negative axial rake angle of from about 25 to about 35°.
Dependencies are inferred from the claim text.