A milling machine includes a spindle which is arranged to receive a tool holder and in use to cause rotation of the tool holder within the spindle. A portion of the spindle housing surrounding the tool holder is provided with at least one pair of opposing damping units.

A vibration damping device for a machine tool spindle is provided. An annular support plate is mounted at a lower portion of a distal end of the spindle, a plurality of support bars is fixed to the support plate in a vertical direction and installed in a longitudinal direction of the spindle adjacent to an outer periphery of the spindle, a pair of weight disks stacked by a plurality of arc-shaped disks made of a tuned mass member is fixed to be in close contact with the outer periphery of the spindle, facing each other, and a damping sheet made of an elastic member is inserted between the outer periphery of the spindle and the weight disks. The vibration damping device of the present invention may maximize a vibration damping effect by installing the vibration damping device at a position closest to the spindle where a vibration occurs. Furthermore, the vibration damping device of the present invention may effectively attenuate a variety of vibration phenomena having various resonant frequencies of a machine tool spindle by constituting the vibration damping device in a plurality of modular types which have different resonant frequency bands, respectively.

Mass damper device comprising a tubular housing having a first and a second longitudinal end; at least one damping mass which is received in the tubular housing with a circumferential clearance; a first resilient element and a second resilient element. At least one end closure is arranged at the first or second longitudinal end. The housing and the end closure have cooperating mounting surfaces which define a longitudinal mounting position of the first and second end closures. The mounting surfaces are arranged such that the first and second resilient elements are compressed between the damping mass and the end closure, when the first and second end closures have been mounted, at the longitudinal mounting position, to the housing.

A spindle arrangement for a machine tool, comprising a spindle for driving a tool and at least one actuator for exciting vibration of the tool, characterized in that the spindle arrangement is provided with a compensation device for at least partly compensating the inertia forces produced by the vibration excitation in the spindle region.

There is provided a vibration suppression device, a machine tool including the device and a vibration suppression method using the device. The vibration suppression device includes a flexible member having a first position F fixed to the structure to be a fixed end of a cantilever and a second position on a free end side; and a weight attached to the flexible member in the second position. The vibration suppression device has an adjustment mechanism for changing a distance between the first position and the second position. Accordingly, it can effectively suppress vibration of a structure, and that can effectively suppress the vibration by easy adjustment when the characteristic of a generated vibration is different.

An integrated online dynamic balance terminal by 3D rapid prototyping includes a central tapered hole formed at a lower portion thereof, a plurality of identical balance cavities peripherally and spacedly formed on the integrated online dynamic balance terminal. Each two the adjacent balance cavities are separated by a cavity partition. The integrated online dynamic balance terminal further has a plurality of guiding channels indently formed on an inner peripheral surface thereof, wherein each of the four guiding channels communicates with a corresponding balance cavity through a corresponding trapezoidal hole. The integrated online dynamic balance terminal has a plurality of bored holes spacedly formed on an engagement surface. The integrated online dynamic balance terminal is configured from 3D rapid prototyping so as to form an integral one-piece structure, wherein some portions requiring high precision are arranged to undergo additional machining processes.

A tool spindle for machine tool includes a tool spindle having a front end in which a tool is mounted and installed to be rotatable, and a vibration damping device mounted in a rear end of the tool spindle to damp cutting vibration generated at the front end of the tool spindle, and including a rigid member coupled to the rear end of the tool spindle and a tuned mass member elastically supported by the rigid member.

Mass damper for a cutting tool, the mass damper comprising at least one damping mass; and at least one spring element arranged to support the damping mass, wherein the spring element comprises a nanostructure with a structural size of 100 nm or less in at least one dimension. A cutting tool comprising the damping mass is also provided.

The invention relates to a machine tool system (1) comprising a machine tool (2) comprising a spindle (3) that can be rotatably driven for machining workpieces, with a plurality of tools each clamped in chucks (5), in the form of so-called tool heads (4), that can be coupled to the spindle (3), and a balancing device (8) for balancing the tool heads (4), the machine tool system (1) comprising a data memory (11) in which the balancing protocol associated with each system-associated tool head (4) is stored, and a controller (12) that reads balancing data from the balancing protocol, for a tool head (4) coupled to the spindle (3), and compares it with at least one parameter of the machining for which said tool head (4) is provided, or with at least one general balancing parameter, the machine tool system (1) preferably being designed such that it rejects a tool head (4) when there is no available balancing data for said tool head (4).

A balance and runout amount adjustment system for a rotary tool includes a rotary tool constituted of a tool holder mounted on a spindle, a balance determining device configured to obtain outer circumference position data of the rotary tool and to determine a mass balance of the rotary tool based on the outer circumference position data obtained, in the course of rotation of the rotary tool and a runout determining device configured to obtain shape data of the rotary tool and to determine a runout amount of the rotary tool based on the shape data obtained, in the course of rotation of the rotary tool. The rotary tool is configured to be capable of adjustment of the mass balance based on the result of the determination made by the balance determining device and capable also of adjustment of the runout amount based on the result of the determination made by the runout determining device.