Drill bit for Kevlar laminates

Details Drill bit for Kevlar laminates Drill bit for Kevlar laminates

1982-09-29

1985-07-16

Briggs, William R.

Cutting by use of rotating axially moving tool

Tool or tool with support

Having inversely angled cutting edge

408211, 408230, B23B 5100

Patent

active

045293414

ABSTRACT:
An improved drill bit for drilling Kevlar laminates or the like, has a pair of helical edges each terminating in an outer cutting point; a center point; and concavely curved cutting edges extending between the center point and each of the outer cutting point. The cutting edges curve back sharply from the cutting points in a plane transverse to the longitudinal drill bit axis and in a direction opposite to normal rotation of said drill bit so as to draw material served by the cutting points radially inwardly from the edge of a bore. A method is disclosed for modifying a conventional drill point to the novel configuration by grinding on a grinding wheel.

REFERENCES:
patent: 228421 (1880-06-01), Thuston
patent: 2600286 (1952-06-01), Weiland
patent: 2613710 (1952-10-01), Emmons
patent: 4209275 (1980-06-01), Kim
patent: 4285620 (1981-08-01), Luebbert et al.
patent: 4330229 (1982-05-01), Croydon
"Cutting Holes in Fabric-Faced Panels"; Peterson; NASA Tech Brief, p. 391, Fall 1980.

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