A vibration absorber includes a screw, a displacement adjustment member, a first spring, a second spring, a mass block, a casing, a cover and a connector. The displacement adjustment member is engaged with the screw. The mass block is located between the first spring and the second spring, wherein the mass block respectively connects the first spring and the second spring on both sides and the screw passes through the mass block. The casing encloses the screw, the displacement adjustment member, the first spring, the second spring and the mass block. The cover covers one opening of the casing. The connector covers the other opening of the casing. The first spring is located between the mass block and the displacement adjustment member and connects respectively the mass block and the displacement adjustment member. The coefficients of elasticity of both the first spring and the second spring are both non-linear.

A machine tool includes at least first and second machining units being disposed adjacent each other in a first axial direction, movable independently of each other in second and third axial directions and disposed on a common machine bed. Stand units on both sides of the machining units are spaced apart from each other in the first axial direction. In order to provide high production flexibility and easy and cost-effective production and use, the machining units are guided by upper and lower guides and are movable independently of each other in the first, second and third axial direction, and/or the machine tool has a working width permitting at least one third machining unit to be provided and removed again in the first axial direction adjacent the first and/or the second machining unit. All of the machining units are structurally identical and/or have the same travel paths.

In a machine tool, when machining is in a steady zone, a rotation phase of a main spindle at the time of measurement in the N-th sampling is calculated, and the calculated rotation phase and the measurement value are recorded in a recording section so as to be associated with each other. The measurement and calculation of the rotation phase of the main spindle at the time of each measurement are continued for plural times of rotations of the main spindle, and thus the measurement values are obtained at various rotation phases, whereby change in drive force during one rotation of the main spindle is finally calculated.

A spindle phase indexing device for a machine tool is equipped with a guide rail detachably or fixedly attached to a table, a phase indexing jig configured to travel on the guide rail and which includes a first fitting part, a cutting tool including a second fitting part configured to be fitted with the first fitting part, and a controller configured to store therein a phase of a spindle at a point in time when the first fitting part and the second fitting part are fitted together. The first fitting part and the second fitting part are formed such that rotation of the cutting tool is constrained when the first fitting part and the second fitting part are fitted together.

The device and the corresponding method according to the invention relate in particular to a CNC machine tool and a machining method preferably for large machining patterns. The CNC machine tool may comprise a machining head 2 which may be connected to a Z-axis 1 such that it can be manually and/or automatically changed, and which may have at least two tool spindles 3 for receiving tools 4. The Z-axis 1 can be moved in a linear manner at least along two linear axial directions. The Z-axis 1 and/or the machining head 2 may have at least one axis of rotation.

An object is to provide a machine-tool spindle cooling method and a machine tool capable of suppressing thermal deformation of a spindle while achieving energy saving. To achieve it, a machine-tool spindle cooling method is provided in which bearings (13) and a spindle rotation motor (14) that generate heat with rotation of a spindle (12) are cooled by causing a spindle cooling device (18) to supply and circulate cooled cooling oil inside a housing (11) rotatably supporting the spindle (12), the method comprising deactuating the spindle cooling device (18) to thereby stop supplying the cooling oil in a case where the number of revolutions of the spindle (12) is less than or equal to a predetermined number of revolutions and the temperatures of the bearings (13) and the spindle rotation motor (14) detected by temperature sensors (15, 16) are less than or equal to a predetermined temperature.

The invention relates to a motor spindle comprising at least one spindle drive which can be supplied with energy and/or operating supplies via at least one feed line. This motor spindle has a fixedly installed first coupling element of a multi-coupling, to the ports of which the feed lines for transmitting energy and/or operating supplies are connected. The invention also relates to a machine tool comprising such a motor spindle, wherein the machine tool has a second coupling element of the multi-coupling. On this second coupling element, the respective complementary ports for transmitting energy and/or operating supplies are arranged.

The present invention relates to a machine tool for machining a workpiece. The machine tool has a motor spindle for the rotative actuation of a tool. The motor spindle is supported by a stand. A turning bearing is provided at the stand and the motor spindle at the turning bearing is pivotable and positionable about a first turning axis. At the motor spindle, a linear guide is provided, which enables an advancing movement of the tool parallel to the spindle axis.

A machining unit for a program-controlled machine tool. In particular, a spindle device for a program-controlled machine tool including a spindle housing; a working spindle which is mounted in the spindle housing in a rotatable manner about a spindle axis and which includes a clamping device for clamping a tool interface that is inserted in a tool receiving section of the spindle device and is configured to hold a milling or boring tool; and a sensor device which is arranged on the spindle housing and which includes at least one structure-borne sound sensor configured to detect structure-borne sounds or vibrations occurring during grinding operations.

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.