Abstract: A drill bit for a drill includes at least one flute having a rake face including a flute edge and at least one cutting edge having a profile that extends along at least a portion of a length of the cutting edge, the rake face extending from the cutting edge. A chip breaker formed in the rake face, the chip breaker being a continuous groove located adjacent the cutting edge, the groove having a starting end and an exit end opening into the flute edge, the starting end having a depth that is less than a depth of the exit end of the groove, wherein a shape of the groove at the starting end is different from a shape of the groove at the exit end.

Abstract: A drill bit for a drill includes at least one flute having a rake face including a flute edge and at least one cutting edge having a profile that extends along at least a portion of a length of the cutting edge, the rake face extending from the cutting edge. A chip breaker formed in the rake face, the chip breaker being a continuous groove located adjacent the cutting edge, the groove having a starting end and an exit end opening into the flute edge, the starting end having a depth that is less than a depth of the exit end of the groove, wherein a shape of the groove at the starting end is different from a shape of the groove at the exit end.

Abstract: A sintered cubic boron nitride (cBN) compact for use in a tool is obtained by sintering a mixture of (i) cubic boron nitride, (ii) aluminum oxide, (iii) one or more refractory metal compounds, and (iv) aluminum and/or one or more non-oxide aluminum compounds. The sintered bodies may have sufficient strength and toughness to be used as a tool material in solid, i.e. not carbide supported, form, and may be useful in heavy machining of cast irons.

Abstract: The present disclosure relates to brazed coated diamond-containing materials and methods of producing brazed coated diamond-containing materials. The method for brazing the coated diamond-containing material may include bringing a braze metal into contact with the refractory metal layer and a substrate; heating at least the braze metal above the melting temperature of the braze metal; and bringing the braze metal into contact with the substrate to form a braze metal layer to join the diamond-containing material, braze metal layer, and substrate together. An advantage of the method may include that the brazing step may be performed in air, under ambient pressure, and without the need for a protective layer.

Abstract: A sintered cubic boron nitride (cBN) compact for use in a tool is obtained by sintering a mixture of (i) cubic boron nitride, (ii) aluminum oxide, (iii) one or more refractory metal compounds, and (iv) aluminum and/or one or more non-oxide aluminum compounds. The sintered bodies may have sufficient strength and toughness to be used as a tool material in solid, i.e. not carbide supported, form, and may be useful in heavy machining of cast irons.

Abstract: A method for machining a fiber cement workpiece into desired dimensions and geometry is disclosed. The method comprises the steps of employing a machine tool to make contact with said fiber cement workpiece and removing material by generating continuous and or semi-continuous chips out of said fiber cement workpiece. The improvement comprises employing a machining tool having at least a cutting tool insert mounted onto said machining tool, said tool insert comprising a superabrasive material of polycrystalline diamond (PCD) or polycrystalline boron nitride (PCBN) having an average grain size less than or equal to about 10 ?m.