Abstract: A blank for a rotary tool for chip removing machining, such as a helix drill or an end mill is formed by advancing a mixture of hard metal powder and carrier through an extrusion passage. The mixture is fed past a core having pins secured thereto for forming respective internal holes through the mixture. Then the mixture is advanced through a rotary part that is rotating about a center axis of the extrusion passage, wherein the rotary part and the internal holes become twisted to a predetermined pitch. The mixture is also advanced past a plurality of shaping parts which project transversely into the extrusion passage for shaping exterior chip flutes in the mixture, e.g., by embossing or cutting. The mixture is allowed to harden into a green body, and the green body is then sintered to form a blank.

Abstract: A drill for chip removing machining includes a front cutting end, a rear securing portion, and a shank extending therebetween. The cutting end includes at least one cutting edge. The drill has at least one internal chip channel and at least one internal flush channel formed in a longitudinal pillar portion of the drill. All portions of the drill are formed of the same material, such as cemented carbide, wherein the chip channel has a surface roughness no greater than 0.5 ?m.