Elongated drill with replaceable cutting inserts

Details Elongated drill with replaceable cutting inserts Elongated drill with replaceable cutting inserts

1996-11-06

1998-10-06

Howell, Daniel W.

Cutting by use of rotating axially moving tool

Tool or tool with support

Having peripherally spaced cutting edges

408229, 408705, 408713, B23B 5102

Patent

active

058167544

ABSTRACT:
A metal cutting drill with replaceable cutting inserts and a length to diameter ratio of four to one or more. Two cutting inserts are positioned in exactly opposed diametric positions, and engage the workpiece in a substantially identical manner to precisely balance the radial forces resulting from drill axially advancing though a workpiece. Through the use of dual cutting inserts, the drill cuts the full circumference of a bore with each one-half revolution and therefore achieves the a faster axial feed rate. By virtue of the inserts being triangular, the curved corners on the cutting edges of the two inserts may be positioned relatively close together and yet sufficient space is left between the inserts to enable the drill shank between the inserts to be relatively thick and strong even at increased length to diameter ratios. Through the provision of a length to diameter ratio greater than four to one, the bores which the drill is able to produce are substantially deeper at any given diameter than those achievable by prior art indexable drills.

REFERENCES:
patent: 3963365 (1976-06-01), Shallenberger
patent: 4373839 (1983-02-01), Negishi et al.
patent: 4813823 (1989-03-01), Bieneck
patent: 5035552 (1991-07-01), Lysenko et al.
patent: 5092718 (1992-03-01), Shallenberger
patent: 5174691 (1992-12-01), Shepley
patent: 5304020 (1994-04-01), Reccius

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