Abstract: A drill-bit tip plate with a first and a second apex distanced from an axis of rotation and having inner and outer cutting edges. The first-and second apex are distanced from the broad sides of the plate. A sintering mold is provided with a first punch, second punch and a sintering die having a channel with a cross-sectional shape that corresponds to the cross sectional shape of the first and second punch. A distal end of the second punch corresponds to a negative shape of the tip front end The first punch has a distal end corresponding to the negative shape of the tip rear end. Sintering powder is compacted in the channel and a force applied to the first and second punch to sinter the sintering powder into the tip. The tip is ejected by pushing the second punch into the channel until the tip is ejected.

Abstract: In a rotary drill, the drill is provided with at least one groove, which has a center lying on the axis of rotation of the drill. The two end points of the groove define a groove width, and the drill is provided with two or more cutting edges. Two cutting angles are defined. The groove has a left side and a right side. The rotary drill can be used in a rotary drilling machine. The drill can be provided with a drill bit.

Abstract: In a rotary drill, the drill is provided with at least one groove, of which one groove has a center lying on the axis of rotation of the drill. The two end points of the groove define a groove width, and the drill is provided with two or more cutting edges. Two cutting angles are defined. The groove has a left side and a right side. The rotary drill may further be used in a rotary drilling machine. The drill may be provided with a drill bit.