Patent ID: 6554369
Filing Date: 2003-04-29
Classification: E21C

Abstract:
A cutting tool comprisinga tool body having a cutting portion and a cylindrical mounting portion positioned axially behind said cutting portion, a seat in a forward end of said cutting portion, said seat having a generally cylindrical wall with a given diameter, a hardened insert in said seat, said insert having a tip portion and a base portion, said base portion defining a cylinder having a diameter substantially less than said given diameter, a plurality of projections extending radially outward of said base portion, said projections having outer ends defining a diameter a little less than said given diameter wherein said plurality of projections centrally position said base within said seat, said base having arcuate portions wherein each of said arcuate portions is a portion of said cylinder defined by said base, said arcuate portions having an angular width about a circumference of said base, said projections having an angular width about said circumference of said base, said angular width of said arcuate portions being at least twice said angular width of said projections, and said insert bonded into said seat.