Patent ID: 6948891
Filing Date: 2005-09-27
Classification: B23B,Y10S,Y10T

Abstract:
1. Drilling tool set comprising a plurality of drilling tools having different operative drill diameters to blast drill holes of different respective diameters, each drilling tool of the set comprising a basic body defining a central axis of rotation, and two replaceable indexable bits including a center bit and a periphery bit which are mountable in respective center and periphery pockets formed in a front end of the basic body, the periphery bits of the respective drill tools of the set being identical, and the center bits of the respective drill tools of the set being identical; each of the center and periphery pockets of each drill tool defining a radial center point; a first of the drill tools having a smaller operative drill diameter than a second of the drill tools; the first tool including a first periphery pocket and a first center pocket; the second tool including a second periphery pocket and a second center pocket; the center point of the first periphery pocket disposed closer to the axis than is the center point of the second periphery pocket; the center point of the first center pocket disposed closer to the axis than is the center point of the second center pocket.