ROTATABLE CUTTING BIT ASSEMBLY WITH CUTTING INSERTS

摘要

A rotatable cutting bit for penetrating an earth formation wherein the rotatable cutting bit (590) includes an elongate bit body (592) having a forward end (594) and a rearward end (596). The bit body (592) further defines a peripheral surface. The bit body (592) has a first cutting insert (640) affixed thereto at the axially forward end thereof. The first cutting insert has a first leading cutting edge (662) and a first side clearance cutting edge (664). The first cutting insert (640) is attached to the bit body (592) so that the first side clearance cutting edge (664) radially extends past the peripheral surface of the bit body (592) so as to engage the earth formation.