Patent ID: 8317439

Claim:
A cutting head ( 10 , 120 ) formed asymmetrically with respect to a longitudinal axis (A) and comprising: a cutting head forward end ( 14 , 124 ), a cutting head rear end ( 16 , 126 ) distal the cutting head forward end ( 14 , 124 ) and a peripheral surface ( 18 , 128 ) therebetween, at least one major guiding segment ( 20 , 130 ) extending from the cutting head forward end ( 14 , 124 ) to the cutting head rear end ( 16 , 126 ) and terminating in a cutting head rear surface ( 56 , 170 ) which forms the rearmost end of both the at least one major guiding segment ( 20 , 130 ) and also the entire cutting head, the at least one major guiding segment ( 20 , 130 ) comprising at the cutting head forward end a cutting edge ( 26 , 132 ) that extends from a forward end center zone ( 28 , 134 ) of the cutting head to the peripheral surface, a radially outermost end ( 30 , 136 ) of the cutting edge defines a cutting diameter (D), the cutting edge has a rake surface ( 32 , 148 ) extending rearwardly therefrom, a major guiding pad ( 44 , 152 ) associated with the cutting edge, the major guiding pad having a guiding pad forward end ( 46 , 154 ), lying on a cylindrical envelope defined by the cutting diameter (D), and a guiding pad rear end ( 48 , 156 ) axially distal therefrom, the guiding pad forward end joins the cutting edge at the radially outermost end of the cutting edge, wherein: the cutting head ( 10 , 120 ) comprises sintered carbide powders; and the guiding pad ( 44 , 152 ) is integrally formed with the cutting head to have unitary one-piece construction.