Printed circuit board drill and method of manufacture

Details Printed circuit board drill and method of manufacture Printed circuit board drill and method of manufacture

1985-10-31

1987-12-15

Swisher, Nancy A. B.

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Including a second component containing structurally defined...

51307, 51309, 428698, 428699, B22F 314, B22F 708

Patent

active

047132868

ABSTRACT:
A composite sintered abrasive drill blank for formation into a rotary cutting tool in which one or more veins of sintered abrasive particulate are positioned to extend longitudinally from the conically shaped point region of the drill blank. The one or more veins of abrasive particulate are directly and molecularly bonded into the drill blank structure to expose the sintered abrasive particulate at both the top conical surface and the circumferential edges of the drill blank, with the sintered abrasive particulate forming the cutting surface elements of the rotary cutting tool formed therefrom.

REFERENCES:
patent: 3136615 (1964-06-01), Bovenkerk et al.
patent: 3141746 (1964-07-01), De Lai
patent: 4359335 (1982-11-01), Garner
patent: 4403015 (1983-09-01), Nakai et al.

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