Spade drill for hard material

Details Spade drill for hard material Spade drill for hard material

1989-12-04

1992-03-10

Schwartz, Larry I.

Cutting by use of rotating axially moving tool

Tool or tool with support

Having peripherally spaced cutting edges

408228, B23B 5100

Patent

active

050945726

ABSTRACT:
A flat drill for boring holes through hard metals and high heat resistance materials such as hard metal and fiberglass. The flute or fluid portion forms a spade with slightly cylindrically concave faces which tend to distally converge. The cutting edges at the base of the drill have a negative rake angle, but a relatively high clearance for this type of drill. The lateral leading edges have a positive rake angle, but are strengthened by cylindrically convex flanks. Nose splits form a small but relatively keen small central burrowing edge which stabilizes the drill.

REFERENCES:
patent: 2889725 (1959-06-01), Turton et al.
patent: 2977828 (1961-04-01), Strickland
patent: 3116654 (1964-01-01), Nider
patent: 3975110 (1976-08-01), Kraiss
Page 130 Sandwik Drill Catalog, Published no later than 1987.
Page 28 Carbro Drill Catalog, Published no later than 1987.
Two pages SGS Tool Catalog, Series 104 and 106, Published no later than 1987.
Page 8 Solid Carbine Spade Drills Catalog, Published no later than 1987.

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