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US 6,676,342 B2Granted
Drill with specialized drill point geometry
AssigneeAllied Machine & Engineering Corp.
InventorsWendell E. Mast, Joseph P. Nuzzi
Life of this patent
Estimating the term…
Abstract
The present invention relates to a drill having an aggressive drill point geometry. The point geometry allows greater stability and feed rates, while decreasing the heat generated at drill point. The present invention is provided by a drill comprising drill body having at least two helical flutes, a pair of cutting surfaces on an end of the drill body, a web formed between the two cutting edges, and a web thinning notch formed on either side of the web. Each notch forms a notch cutting edge having a positive rake angle.
Claims18
A drill comprising:
- a drill body having a shank at one end and a drill point at an opposite end thereof;
- wherein the drill point comprises at least two curved cutting edges, a web formed between the two cutting edges, and a single web thinning notch formed on either side of the web;
- wherein each cutting edge has an associated edge preparation formed thereon;
- wherein each notch forms a notch cutting edge adjacent to and radially inward from one cutting edge of the at least two cutting edges, wherein each notch cutting edge has a positive axial rake angle;
- wherein the notch has a cross-sectional geometry in the form of a “V” having a radius at the apex of the notch and transitioning to substantially planar side walls.
2 more elements
A drill comprising:
- a drill body having at least two helical flutes;
- a pair of curved cutting edges formed transverse to each other on an end of the drill body;
- a web formed between the two cutting edges;
- a web thinning notch formed on either side of the web, each notch forming a notch cutting edge having a positive rake angle;
- wherein the notch has a cross-sectional geometry in the form of a “V” having a radius at the apex of the notch and transitioning to substantially planar side walls.
2 more elements
Dependencies are inferred from the claim text.