The invention relates to a machine tool (1) comprising a clamping holder (10) which extends along a longitudinal axis (3) and a cutting element (20) that can be inserted into an open tool-side recess (40), which passes through the clamping holder (10), transversely to the longitudinal axis (3). The machine tool (1) has a stop (30) which is secured in the recess (40) and against which the cutting element (20) rests in the direction transverse to the longitudinal axis (3).

A boring bar for a non-rotating boring tool includes an elongated main part configured for attachment to a support structure of a metal cutting machine. A front part is arranged to carry a tool part provided with a cutting element and at least one damping module, which is arranged between a front end of the main part and a rear end of the front part and which is provided with an electrically controlled vibration actuator configured to generate vibratory forces for active vibration damping of the boring bar. The front part is connected to the main part via the at least one damping module, wherein the main part, the front part and the at least one damping module together form an elongated body, and wherein the at least one damping module constitutes a length section of the elongated body.

An elongated tool holder includes a mass housing portion having a housing peripheral surface, an outer sleeve having a sleeve hole wall surface, and an anti-vibration arrangement. An elongated groove is formed in one of the housing peripheral surface and the sleeve hole wall surface. In an assembled state of the tool holder, the groove, which is located at a common interface of the housing peripheral surface and the sleeve hole wall surface, forms a groove coolant channel. The groove coolant channel forms part of an overall tool holder coolant channel which is spaced apart from the anti-vibration arrangement, and thus isolates the coolant from the anti-vibration arrangement. A cutting tool incorporates the tool holder.

Spherical bearing assemblies comprise an outer ring, an adjustable receiver adjustably coupled to the outer ring and at least partially received within the outer ring, and a locking bearing adapter configured to operatively couple the adjustable receiver to a boring bar of a machine tool. The locking bearing adapter includes a tapered sleeve partially received within the adjustable receiver bore and tapered toward the outboard direction, an interior nut threadingly coupled to the tapered sleeve and configured to engage the adjustable receiver, and an exterior nut threadingly coupled to the tapered sleeve and positioned adjacent to the interior nut with the interior nut positioned between the exterior nut and the adjustable receiver. Line boring machines comprise a boring bar, a cutting tool, a spherical bearing mount assembly including a spherical bearing assembly, a rotational drive unit, and an axial feed unit.

Spherical bearing assemblies comprise an outer ring, an adjustable receiver adjustably coupled to the outer ring and at least partially received within the outer ring, and a locking bearing adapter configured to operatively couple the adjustable receiver to a boring bar of a machine tool. The locking bearing adapter includes a tapered sleeve partially received within the adjustable receiver bore and tapered toward the outboard direction, an interior nut threadingly coupled to the tapered sleeve and configured to engage the adjustable receiver, and an exterior nut threadingly coupled to the tapered sleeve and positioned adjacent to the interior nut with the interior nut positioned between the exterior nut and the adjustable receiver. Line boring machines comprise a boring bar, a cutting tool, a spherical bearing mount assembly including a spherical bearing assembly, a rotational drive unit, and an axial feed unit.

A boring tool holder has a base member and a cutting insert holding member. The base member has a first main surface and a second main surface opposite to the first main surface. The cutting insert holding member is contiguous to the base member on the first main surface, and disposed in a circumferential direction of the base member as viewed in a direction from the first main surface toward the second main surface. A cross-sectional area of the base member in a cross section perpendicular to the direction from the first main surface toward the second main surface and intersecting the base member is larger than a cross-sectional area of the cutting insert holding member in a cross section perpendicular to the direction from the first main surface toward the second main surface and intersecting the cutting insert holding member.

A cutting tool (35) for machining a differential case, the cutting tool (35) being attached to a machining apparatus and used to perform cutting on a spherical inner surface of a differential case (10), the cutting tool (35) including: a shaft part (50); a cutting edge (51) laterally protruding from the shaft part (50); a fixing part (53) formed at one end side of the shaft part (50) and that is for fixing the shaft part (50) to the machining apparatus; and a retaining part (54) formed at the other end side of the shaft part (50) and that is for retaining the shaft part (50) by the machining apparatus, wherein the cutting tool (35) is able to perform cutting on the spherical inner surface of the rotating differential case (10) in a both-ends-held state in which both the fixing part (53) and the retaining part (54) are supported by the machining apparatus.

There is provided a cutting insert used for both drilling and turning. The cutting insert includes an insert main body having a front surface and a rear surface, the outline shapes of which are parallelogram shapes, peripheral side surfaces disposed on four sides of the insert main body, cutting edges provided on respective intersecting ridge lines between the front surface and the peripheral side surface and between the rear surface and the peripheral side surface of the insert main body, and a hole provided in the insert main body to incline with respect to the front surface and the rear surface, the hole being usable for attachment.

There is provided a cutting insert used for both drilling and turning. The cutting insert includes an insert main body having a front surface and a rear surface, the outline shapes of which are parallelogram shapes, peripheral side surfaces disposed on four sides of the insert main body, cutting edges provided on respective intersecting ridge lines between the front surface and the peripheral side surface and between the rear surface and the peripheral side surface of the insert main body, and a hole provided in the insert main body to incline with respect to the front surface and the rear surface, the hole being usable for attachment.

A fixing device for fixing a boring bar on a material-removing machine includes a reducing sleeve with a hollow profile arranged on a front face which faces away from a machine chuck. The boring bar is received in an interior of the hollow profile. An end region of the boring bar projects from the hollow profile and carries a cutting tool. The hollow profile has a wall arranged between the interior and an exterior of the hollow profile. The wall has a first thickness and a second thickness. The first thickness is less than the second thickness. The first thickness is established at a side of the fixing device where the cutting tool projects radially from the boring bar. A longitudinal axis of the hollow profile is parallel to and at a distance from the axis of the reducing sleeve which is coaxial with the interior of the boring bar.