Patent ID: 7959234
Filing Date: 2011-06-14
Classification: B28D,E21C

Abstract:
1. A rotatable cutting tool for impingement upon a substrate and adapted to be rotatably retained within the bore of a holder, the rotatable cutting tool comprising: an elongate cutting tool body having an axial forward end and an axial rearward end, the cutting tool body containing a socket at the axial forward end thereof; a hard cutting member being affixed to the cutting tool body within the socket, the hard cutting member having an axial forward end and an axial rearward end, and the hard cutting member having an axial length; the hard cutting member having a superhard axial forward portion at the axial forward end thereof, and the superhard axial forward portion having a maximum transverse dimension; the hard cutting member further having a hard axial rearward portion contiguous with and axial rearward of the superhard axial forward portion, and the hard axial rearward portion having a maximum transverse dimension; and a ratio of the maximum transverse dimension of the hard axial rearward portion to the axial length of the hard cutting member ranging between about 0.75 and about 0.85.