A cutting insert is configured to include: a first portion having a rake face, a flank face, a cutting edge, and a face facing an insert attachment portion at an end of a tool main body; and a second portion having a side surface including at least one flat plane that is parallel to a center line of a tool or inclined at a prescribed angle to the center line. The second portion extends continuously to a region surrounded by the face of the first portion. The second portion is fitted into the tool main body to position the cutting insert and to prevent the cutting insert from rotating.

A high-speed tool holder includes: a tool shaft for accommodating a tool at its first end, and a machine clamping part which is integrally connected to the tool shaft and forms an interface for clamping in the machine; with the tool shaft being substantially truncated circular cone-shaped, a first diameter at the first end with the tool insertion opening being smaller than a fifth diameter at the second end at the machine clamping part; and a portion of the substantially truncated circular cone-shaped tool shaft having an outwardly bulging, preferably spherical, shape between the tool insertion opening and the machine clamping part.

A device for coupling and centering tools has a tubular portion with a coupling seat laterally delimited by a cylindrical centering surface, a first threaded hole with a first tightening dowel projecting into the coupling seat, a second threaded hole with a second tightening end projecting into the coupling seat, a third hole tangential to the centering surface and a locking pin removably lockable in the third hole in a position interfering with the coupling seat, and removable from the third hole to free the coupling seat.

A positioning device for drilling tools of various sizes contains: a body and an accommodation case. The body includes an inserting portion with at least one positioning structure configured to insert drilling tools of various sizes. The body also includes at least one mounting set configured to mount the body on a working face, an inlet defined on a top thereof, and a channel defined in a bottom thereof and communicating with the inlet and the inserting portion. The accommodation case is configured to accommodate coolant and includes an outlet formed on a first end thereof and an air hole arranged on a second end thereof. Between the accommodation case and the body is defined a connection structure configured to connect the accommodation case with the elongated plate and to align the outlet of the accommodation case with the inlet of the body.

A cutting tool insert includes eight identical cutting edges. Each separate cutting edge has a first cutting edge portion and a second cutting edge portion. A corner angle between the first cutting edge portion and the second cutting edge portion is within a range of 75 to <90 degrees. The first cutting edge portion and the second cutting edge portion have substantially the same length to provide a substantially equal cutting depth. As seen along the center axis of the insert a first angle within a range of 14+/−9 degrees is formed between a first imaginary line extending from the center axis to a corner point at the first side surface and a second imaginary line extending from the center axis to an adjacent corner point at the second side surface. A cutting tool insert holder is also disclosed.

A tool holder is provided comprising a base body for coupling with a drive spindle that can be driven rotatingly, whereon a clamping chuck for clamping a tool is provided, further comprising a damping element arranged between the base body and the clamping chuck, wherein the damping element is made of an elastomeric material or of a shape memory alloy, and wherein the clamping chuck is solely connected to the base body by means of the damping element.

A method for reloading a single-flute drill comprising a shaft made of a hard metal and a drill head that is connected to the shaft and is made of a hard metal, is characterized by the following steps: removing a worn drill head from the shaft; integrally bonding a new drill head to the shaft.

A tool holder is disclosed for holding a tool shaft of a tool, the tool holder having a receiving bore for receiving the tool shaft in a predetermined axial position, having a seal at an inner end of the receiving bore, and further comprising a coolant supply from a machine-side into a bore of the tool shaft, wherein the seal has an at least partially elastically deformable sealing element.

A cutting insert includes a body having an upper face, a lower face, a plurality of planar flank faces joining the upper and lower faces, and a plurality of curved flank faces joining the plurality of flank faces. A T-land is formed at a downward sloping angle with respect to the upper face. A cutting edge is formed at an intersection of a respective flank face and the T-land. A curved cutting edge is formed at an intersection of a respective curved flank face and the T-land. A micro-channel is formed in one of the flank faces, the curved flank faces and the T-land and proximate one of the cutting edge and the curved cutting edge.

Drill plate assemblies are disclosed in the examples herein. An example method includes positioning an absorbent material between a drill plate and a surface to be drilled; performing a drilling operation on the surface including flowing coolant through the drill; and capturing at least some of coolant in the absorbent material.