Spade drill insert having helical margins

Details Spade drill insert having helical margins Spade drill insert having helical margins

2006-02-17

2009-06-16

Howell, Daniel W (Department: 3726)

Cutting by use of rotating axially moving tool

Tool or tool with support

Having peripherally spaced cutting edges

C408S227000, C408S713000

Reexamination Certificate

active

07547166

ABSTRACT:
A spade drill insert and drilling tool assembly is provided wherein the lands of the spade drill insert have helical margins which provide increased stability during cutting operations and the holder has a clearance surface providing better chip evacuation. The margin may have a helical trailing side or leading side, a parallel helical margin, or may also include a gullet or flute adjacent the helical margin.

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