Abstract: A method of producing a plurality of tool inserts (20) from a body of polycrystalline ultra-hard material (10), in particular polycrystalline diamond and polycrystalline cubic boron nitride, having major surfaces (12, 14) on each of opposite sides thereof. The method includes the step of simultaneously producing a plurality of spaced holes (16, 26) in the body, each hole generally extending from one major surface to the opposite major surface. The holes are produced by a plurality of electrodes which may be arranged in a desired pattern. The body is severed between the holes to produce the plurality of tool inserts.

Abstract: A method of producing a plurality of tool inserts (20) from a body of polycrystalline ultra-hard material (10), in particular polycrystalline diamond and polycrystalline cubic boron nitride, having major surfaces (12, 14) on each of opposite sides thereof. The method includes the step of simultaneously producing a plurality of spaced holes (16, 26) in the body, each hole generally extending from one major surface to the opposite major surface. The holes are produced by a plurality of electrodes which may be arranged in a desired pattern. The body is severed between the holes to produce the plurality of tool inserts.

Abstract: A unit including a plurality of tool inserts, such as used in saw blades for use in woodworking. Each insert defines a working region and is adapted to be secured to a tool to present that region with a predetermined orientation. A body defines a plurality of discrete zones, each zone having an insert located therein such that the orientation of the working portion at each insert in the zone is the same.