A cutter holder has a body and a damping assembly. The damping assembly is contained inside the body. The damping assembly has a central damping pole and six auxiliary damping poles. The six auxiliary damping poles are arranged around the central damping pole. The body has a specific weight. The central damping pole has a specific weight larger than the specific weight of the body. Each one of the six auxiliary damping poles has a specific weight larger than the specific weight of the body. The damping assembly is utilized to reduce vibrations caused by machining.

A tool body includes a damping apparatus for damping vibrations in a machining tool having, besides the tool body, a member with at least one cutting edge to be secured to the tool body. The damping apparatus is arranged in an internal room of the tool body and includes a damper mass body with an axial bore and a central tube extending through the bore and which is rigidly secured to the damper mass body inside the through bore. A central tube is also at both ends thereof rigidly connected to a tool body fixed part and the central tube is made of a material with a spring property allowing the damper mass body to oscillate in the internal room perpendicularly to the longitudinal extension of the central tube.

Provided is an endmill. The maximum spindle speed, per one minute, of a main spindle to which the endmill is attached is Smax. The number of teeth of the endmill is N. The outer shape of the endmill is Da. The natural frequency at which vibrations at the end of the endmill reach a maximum level is ω1. ω1 and/or N are set so that when the diameter-direction infeed amount of the endmill is set to Rd: i) ω1×60/N×6<Smax, if Rd is at least 4% of Da; and ii) ω1×60/N×3<Smax, if Rd is less than 4% of Da.

A receptacle for a rotating tool includes a rotationally symmetrical, hollow-cylindrical receptacle main body. A through-pipe, which is braced in particular in relation to the receptacle main body, is disposed in a cavity of the receptacle main body so as to be spaced apart from a cylinder barrel of the hollow-cylindrical receptacle main body.

A tool (T) is provided with: a shaft-like tool body (11) having a first end portion (11a) extending along a central axis line (Ot) and attached to a main shaft, and a second end portion (11b) on an opposite side to the first end portion (11a); and a fore end portion (12) connected to the second end portion (11b) of the shaft-like tool body (11). The fore-end portion (12) includes a central portion (13) including a fore-end face (17) of the tool (T), and a plurality of blade portions (14) protruding radially outward from the central portion (13). A cutting blade of each blade portion (14) includes a main cutting blade (15) adjacent to the fore-end face (17). The main cutting blade (15) includes an outline that forms an angle of 30-150 degrees with respect to the central axis line (Ot) in a cross-sectional view including the central axis line (Ot).

A tool holder, for a tool assembly, comprising a tubular element having a cavity and a central axis; a damping mass arranged within the cavity and movable radially with respect to the central axis and relative to the tubular element; an adapter having a rear part fixed to the tubular element, and a front part for connection to an end effector of the tool assembly, the rear part comprising an opening, and the damping mass is at least partly received in the opening with a radial clearance; and an elastic element positioned between the adapter and the damping mass, the elastic element being arranged to support the damping mass and to damp radial vibrational movements of the damping mass relative to the tubular element, and the elastic element comprising a front surface substantially perpendicular to the central axis and a rear surface substantially perpendicular to the central axis.

A cutting tool includes: a main body portion composed of a cemented carbide; and a front end portion composed of a binderless cubic boron nitride polycrystal, the front end portion being joined to the main body portion. In an axial direction along a rotation axis of the main body portion, the main body portion has a first end and a second end opposite to the first end. The front end portion has a neck portion and an edge portion, the neck portion protruding from the second end along the axial direction, the edge portion being continuous to the neck portion, the edge portion being located at a location distant away from the second end relative to the neck portion in the axial direction. In the axial direction, the neck portion has a third end on the edge portion side and a fourth end opposite to the third end.

A representative machine comprises a non-rigid robotic device having a tool head; and a rigid inertial stiffening system that is part of a tool head and includes a mass to provide precise position of the tool head. The rigid inertial stiffening system achieves high positional precision of the tool head, in the face of large disturbing forces by locally accelerating the mass to counter the disturbing forces.

A end mill includes: an end mill body having a rotation axis, the end mill body including a shank portion and a cutting portion with an outer peripheral cutting edge; an end cutting edge including a first cutting edge and a second cutting edge; a first gash opening between the first cutting edge and the second cutting edge; and a second gash located adjacently to the first gash in the rotational direction, and opening to a side closer to the outside peripheral from the chisel portion. A ratio (L1/L2) of a length (L1) from a distal end of the end mill body to a terminal end of the first gash to a length (L2) from the distal end of the end mill body to a terminal end of the second gash, when viewed from a side, is from 0.8 to 1.1.

A hob for a cutting apparatus including a hollow body of a sintered hard metal composition and a cavity located within the body, the cavity having a volume in the range of about 10% to about 90% of the volume of the body.