The invention relates to single-lip drills and double-lip drills, in which one or more depressions are formed in the rake face. The depressions according to the invention are arranged in the longitudinal direction of the tool at a distance from the cutting edge and have a positive influence on chip breaking.

The invention relates to a single-lip drill and a double-lip drill having a plurality of chip-forming devices or depressions in the rake face which are arranged in succession and at a distance from one another. As soon as a cutting edge and/or the associated chip-forming device or the associated depression is worn, the deep hole drill according to the invention can be reground using simple means.

A metal cutting drill insert for a drill tool having a chip disruptor provided at a rake face. The chip disruptor is further configured with a chamfer at a leading cutting edge region to increase cutting resistance and facilitate chip breakage.

A cutting insert may include a first surface and a second surface. The first surface may include a first side, a first corner, a second corner, and a breaker part. The breaker part may include a first segment, a second segment, and a third segment. The first segment may be an inclined surface inclined so as to approach the second surface as going away from the first side. The third segment may be an inclined surface inclined so as to separate from the second surface as going away from the second segment. In a front view of the first surface, a maximum value at a side of the second corner may be greater than a maximum value at a side of the first corner in a distance from the first side to a top portion of the third segment on an orthogonal line with respect to the first side.

A drill bit includes an elongated shaft having an outer surface forming plural lands and spaces between the lands forming a helical flute; a shank located at a first end of the elongated shaft, the shank configured and arranged to engage the drill bit in a tool; a head located at an opposing end of the elongated shaft from the shank, the head including a first cutting arm and a second cutting arm, the first cutting arm including a first cutting portion having a first leading cutting edge, the second cutting arm including a second cutting portion having a second leading cutting edge; and wherein the first cutting arm includes a first groove extending through the first leading cutting edge and the second arm includes a second groove extending through the second leading cutting, the first and second grooves configured to cause shorter fibers, shavings or chips.

The invention relates to a step drill having a shaft section extending along a longitudinal axis of the step drill and a cutting section with a cutting tip, and having a chip-breaking geometry which comprises a concavely curved surface and is configured such that ribbon chips are broken on the concavely curved surface during rotation of the step drill, whereby the chip-breaking geometry is disposed on a reaming step of the step drill.

The invention relates to a single-lip drill with an inner and an outer rake face. Very good hole straightness deviation values and endurance are obtained with the ground face according to the invention.

There is provided a machining assembly and cutting insert for machining metal or like workpieces, wherein the cutting insert body has a cutting end. The cutting end comprises at least one cutting edge and at least one cutting lip formed adjacent the at least one cutting edge. The at least one cutting lip includes at least one cutting protrusion and associated chip cutting edge to split the chip formed by the at least one cutting edge, for producing chips during machining which are of a width that is sufficiently reduced to allow proper evacuation or removal.

A cutting insert may include a first surface and a second surface. The first surface may include a first side, a first corner, a second corner, and a breaker part. The breaker part may include a first segment, a second segment, and a third segment. The first segment may be an inclined surface inclined so as to approach the second surface as going away from the first side. The third segment may be an inclined surface inclined so as to separate from the second surface as going away from the second segment. In a front view of the first surface, a maximum value at a side of the second corner may be greater than a maximum value at a side of the first corner in a distance from the first side to a top portion of the third segment on an orthogonal line with respect to the first side.

A drill bit includes an elongated shaft having an outer surface forming plural lands and spaces between the lands forming a helical flute; a shank located at a first end of the elongated shaft, the shank configured and arranged to engage the drill bit in a tool; a head located at an opposing end of the elongated shaft from the shank, the head including a first cutting arm and a second cutting arm, the first cutting arm including a first cutting portion having a first leading cutting edge, the second cutting arm including a second cutting portion having a second leading cutting edge; and wherein the first cutting arm includes a first groove extending through the first leading cutting edge and the second arm includes a second groove extending through the second leading cutting, the first and second grooves configured to cause shorter fibers, shavings or chips.