Drill insert having curved cutting edges

Details Drill insert having curved cutting edges Drill insert having curved cutting edges

2007-07-10

2007-07-10

Howell, Daniel W. (Department: 3722)

Cutting by use of rotating axially moving tool

Tool or tool with support

Having peripherally spaced cutting edges

C408S227000, C408S713000

Reexamination Certificate

active

11276864

ABSTRACT:
A spade drill insert and drilling tool assembly is provided wherein the spade drill insert body comprises curved cutting edges and a lip groove having a trough substantially parallel to a plane formed through each adjacent curved cutting edge, which provides a significant improvement in chip formation during cutting operations.

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