This disclosure relates to a machining tool having a base body which is rotatable about a rotary axis and movable in a feed direction along the rotary axis, at least one cutting element which is fixed on the base body and has a front cutting edge pointing in the feed direction, and a flute associated with the cutting element and formed by a recess in the base body. In order to control the chip flow, according to this disclosure, a flute cover mounted on the base body is proposed, which outwardly covers a chip removal area of the flute adjoining the cutting element.

A tool for machining an outer circumferential surface of a workpiece, with an interface adapted for fastening the tool to a counter interface, and a base body which is cylindrical at least in sections. The base body has a circumferential wall encompassing a mounting space and is configured to be open at the frontal side in such a way that the workpiece can be at least partially accommodated in the mounting space. At least one cutting edge engaging in the mounting space is arranged on the base body for the machining of the outer circumferential surface of the workpiece. The circumferential wall has at least one chip passing recess which is arranged relative to the at least one cutting edge in such a way that chips removed by the at least one cutting edge during the machining of the workpiece can exit through the at least one chip passing recess from the mounting space into an outer surrounding area of the base body.

A lathe has a plurality of turret positions with at least one having a toolholder, a pair of blades projecting from one end of the toolholder with the toolholder structured to assume a first position with a first blade machining said workpiece which is rotating in a first direction and a second position with a second blade structured to assume a second position with the workpiece rotating in the other direction. The toolholder remains fixed during machining. Related methods and toolholders are disclosed.

A machine tool includes a main spindle that rotates while holding a workpiece, a holder that holds first and second cutting tools including first and second linear cutting blades to cut the workpiece, and a moving device that moves the first and second cutting tools relative to the workpiece in a moving direction including at least a Z-direction and a Y-direction. The holder holds the first and second cutting tools such that the cutting tools are arranged along the moving direction in a state in which the directions of the linear cutting blades are inclined with respect to the Z-direction when seen from the X-direction and are not parallel with each other.

A damper assembly for use with a non-rotating tool holder includes a hollow ram for supporting a non-rotating tool and a damper assembly mounted in the hollow ram for absorbing vibrations of the ram. The damper assembly includes a front plate and a rear plate, an upper tie rod and a lower tie rod extending between the front plate and the rear plate, and a damper mass mounted between the front plate and the rear plate. Ring dampers are mounted between the damper mass and the front and rear plates, and suspension springs are mounted between the upper tie rod and the lower tie rod. The suspension springs carry the weight of the damper mass so that the ring dampers do not have to carry the weight of the damper mass, and the damper mass is free to respond to vibrations in the ram.

A cutting insert for threading of the present invention includes two opposing end surfaces and a peripheral side surface extending therebetween. The peripheral side surface has a first side surface portion and a second side surface portion arranged at different positions in a circumferential direction. A cutting edge is formed at an intersecting ridgeline portion between the first end surface and the first side surface portion and at least a portion of this cutting edge has a shape corresponding to a thread groove. The second side surface portion has an inclined portion which enlarges outward from the side of the first end surface toward the side of the second end surface. This inclined portion is configured to engage with a side wall surface of a tool body so as to prevent floating of the cutting insert.

A dual tip cutter (10) includes a body (12) defining a feed direction (F), a cutting direction (C) perpendicular to the feed direction, and a depth direction (D) perpendicular to both feed and cutting directions. A first cutting portion (35) is fixed relative to the body at a body first end. A second cutting portion (45) is fixed relative to the body at the body first end, adjacent the first cutting portion. The first and second cutting portions are stacked in the cutting direction so that the first cutting portion forms a leading cutting portion and the second cutting portion forms a trailing cutting portion for simultaneous cutting. The second cutting portion extends from the body further in the depth direction than the first cutting portion. A relative position between the first and second cutting portions is set such that a total chip load is shared between the first and second cutting portions in a predetermined ratio (K).