Printed circuit board drill and method of manufacture

摘要

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.