Abstract: A facing head as well as a method for inserting a tool into and/or removing a tool from a tool holder device of the facing head. The facing head has a spindle coupling device for exchangeably coupling with a spindle chuck of a working spindle of a machine tool. The facing head has a housing body at which or in which a facing slide is moveably supported in a guided manner. The facing slide supports the tool holder device. The tool holder device is hydraulically controllable. A hydraulic coupling that is mechanically and hydraulically coupled with an associated hydraulic control coupling of the housing body in a tool change position of the facing slide. Remote from the tool change position, the mechanical and hydraulic connection between the hydraulic coupling and the associated hydraulic control coupling is interrupted.

Abstract: A method for determination of an effective machine use of a machine tool, as well as a machine tool that is configured for this purpose. The machine tool has multiple machine axes in order to move a workpiece and/or a tool. A rotary drive drives the workpiece or the tool in order to remove material. A control unit of the machine tool determines a use duration characteristic parameter (T) and an output power characteristic parameter (L) and determines therefrom a machine use characteristic parameter (M). The use duration characteristic parameter (T) describes a duration during which the workpiece is machined by the tool. The output power characteristic parameter (L) describes the applied or required power in order to effect the material removal. The machine use characteristic parameter (M) is determined by the control unit, such that it can be transmitted to an external unit for further evaluation or processing.

Abstract: The machine spindle arrangement (22) according to the invention forms a unit with a motor (19) as central element. At one side of the motor (19) a spindle neck (35) with a spindle (32) is flanged that is directly driven by the rotor (28) of the motor (19). The spindle (32) is a so-called null spindle that can be replaced without readjustment with all bearings and other wear parts due to the present exactly adjusted positioning surface (39) that abuts against an axially properly defined bearing contact surface (38). At the backside of the motor (19) facing away from the spindle (32), a tool releasing device (20) and an angle adjustment transmission (21) is arranged that serves to rotate a present traverse feed shaft (42) relative to the spindle (32). The traverse feed shaft (42) serves to actuate an adjustment device at the tool (15).

Abstract: The machine tool (10) has an asymmetrically constructed workpiece positioning device (16) which runs on three guide rails (17, 18, 19). It comprises two carriages (20, 45) which are connected together by a workpiece carrier (31) that is mounted so as to be rotatable about the A axis. While the first carriage (20) serves for the longitudinal and rotary positioning of the workpiece carrier (31), the second carriage (45) is provided merely for supplementary weight support. This results in a mechanically slimline, low-weight structure with high positioning accuracy. High dynamic loadability and thus a high machining rate and particularly high vibration resistance is allowed.

Abstract: The inventive working spindle comprises a spindle housing and a spindle shaft with axial positioning surface and axial contact surface by which the correct axial position of each fitting provided spindle shaft in the spindle housing is obtained. For torque-proof holding of the spindle shaft in the spindle housing, preferably with stationary motor, a braking unit is provided that comprises a radial outer part that is coupled with the spindle housing in a torque-proof manner and a radial inner part that is coupled with the spindle shaft in a torque-proof manner. The largest outer diameter of the peripheral surface of the inner part is smaller than the narrowest location of the through-opening of the spindle housing between the braking unit and the tool side end of the spindle housing. For this reason the spindle shaft can be readily removed from the spindle housing without disassembly measures of the braking unit, if required, and can be reinserted in reverse route.

Abstract: A workpiece holder device for a machine tool has a holder, which has a support part and a holder part. The support part supports the holder on a support device, preferably so that the holder can rotate about an axis of rotation. The holder part is set up to hold a workpiece directly or indirectly. To avoid, or at least minimize deviations from a desired alignment of the holder part based on elastic deformation of the holder due to the weight force of the workpiece, the holder has at least one mechanical or hydraulic pretensioning device arranged on or in it. The pretensioning device can be used to pretension the material of the holder, so that the pretensioning device applies a tensile stress or a compressive stress to at least one part of the holder. This can counteract a deviation of position due to an elastic deformation of the holder.

Abstract: A method and machine for machining shafts, such as crankshafts of an internal combustion engine wherein the shaft supported on a workpiece carrier rotatably about its axis and the carrier is movable relative to a milling tool adjustably supported on the machine, the bearing surfaces of the shaft are fine-machined by a milling tool taking into consideration the resiliency and the bending of the shaft by the engagement force of the milling tool during fine cutting of the bearing surfaces in the various angular rations of the shaft and the axial bearing location between the shaft ends so as to provide for a perfect final round cutting of the bearings without the need for wet grinding. The fine machining is preferably achieved by dry machining and orthogonal rotational milling, all main bearings and lifting bearings being machined in a single clamping from the rough machining dimensions to the final dimension.

Abstract: In a cover arrangement for a machine tool for covering guide and drive structures, comprising a pleated wall arrangement which can be expanded and compressed upon movement of a carriage between which and a machine wall it is connected. The pleated wall structures is provided with armor lamellas which are anchored to the pleat sections of the wall structures and over-lap for covering the pleated wall structure which is movably supported on guide tracks which are disposed in planes extending at an obtuse angle facilitating installation and removal of the cover arrangement.

Abstract: In a machine tool arrangement comprising a machine tool component including a mounting structure for a work piece to be machined by a suitable metal cutting tool, a housing enclosing the machine tool component, a horizontal support beam is disposed above the housing and carries handling equipment for supplying work pieces from an adjacent loading area to the machine component for machining and returning the finished work pieces to the storage structure and an intermediate storage structure is disposed near the machine tool component for temporarily storing unfinished work pieces to be machined and finished work pieces after being machined.

Abstract: A machine for machining workpieces has at least one milling tool with an internal cutter. The machine is provided with a first guide system and a second guide system parallel to the first guide system. The first guide system has at least one compound slide having a slide part, wherein the at least one compound slide is moveable in a longitudinal direction of the first guide system and wherein the slide part is moveable transversely to the longitudinal direction. A milling tool is secured on the slide part. The first and second guide systems have sliding guides or roller bearing guides. The at least one compound slide has a transverse guide system and the slide part is guided on the transverse guide system.

Abstract: A rotary machine element has at least one functional part performing movements into stop positions, which stop positions are nominal stop positions or mechanical terminal stop positions and are functionally correlated. At least one position sensor is provided for detecting individual actual position values of the stop positions independently from one another. At least one position sensor is located in a control path between the at least one functional part and an NC control. The control path is active in positions between the nominal stop positions; the mechanical terminal stop positions; or the nominal stop positions and the mechanical terminal stop positions. Based on acquired actual position values of the at least one functional part, the speed and acceleration of the at least one functional part are determined by NC-control.

Abstract: A machine for machining workpieces has at least one milling tool with an internal cutter. The machine is provided with a first guide system and a second guide system parallel to the first guide system. The first guide system has at least one compound slide having a slide part, wherein the at least one compound slide is moveable in a longitudinal direction of the first guide system and wherein the slide part is moveable transversely to the longitudinal direction. A milling tool is secured on the slide part. The first and second guide systems have sliding guides or roller bearing guides. The at least one compound slide has a transverse guide system and the slide part is guided on the transverse guide system.

Abstract: A drive for machine components has at least one threaded spindle having spindle sections with oppositely oriented axial pitch. Nuts are seated on the at least one threaded spindle and engage the spindle sections, respectively. At least one motor is connected to the at least one threaded spindle for driving the at least one threaded spindle. A first one of the nuts is connected to a machine component. A second one of the nuts is spatially stationary. The at least one threaded spindle provides a drive moment for driving the machine component.

Abstract: In a method for stocking tool magazines of a device for machining workpieces, the device having at least a first spindle and a second spindle configured to be independently movable relative to one another at least in one axis, wherein the first and second spindles have correlated therewith at least a first tool magazine and a second tool magazine, respectively, workpiece machining is continued by the second spindle during stocking of the first tool magazine, and workpiece machining is continued by the first spindle during stocking of the second tool magazine. Alternatively, stocking the first and second tool magazines can be carried out simultaneously.

Abstract: A rotary machine element has at least one functional part performing movements into stop positions, which stop positions are nominal stop positions or mechanical terminal stop positions and are functionally correlated. At least one position sensor is provided for detecting individual actual position values of the stop positions independently from one another. At least one position sensor is located in a control path between the at least one functional part and an NC control. The control path is active in positions between the nominal stop positions; the mechanical terminal stop positions; or the nominal stop positions and the mechanical terminal stop positions. Based on acquired actual position values of the at least one functional part, the speed and acceleration of the at least one functional part are determined by NC-control.

Abstract: A drive for machine components has at least one threaded spindle having spindle sections with oppositely oriented axial pitch. Nuts are seated on the at least one threaded spindle and engage the spindle sections, respectively. At least one motor is connected to the at least one threaded spindle for driving the at least one threaded spindle. A first one of the nuts is connected to a machine component. A second one of the nuts is spatially stationary. The at least one threaded spindle provides a drive moment for driving the machine component.

Abstract: A bearing device for a threaded spindle has a bearing housing with at least one receptacle configured to receive a bearing part of the threaded spindle. The at least one receptacle is a clamping bushing securing the bearing part by electromechanical elements or fluid-operated elements. The clamping bushing has a wall that is elastically deformable by a pressure medium. The wall and the bearing housing define an annular chamber configured to receive the pressure medium. A control unit is provided to control the pressure of the pressure medium and thus the clamping action of the clamping bushing.

Abstract: A reversible cutting tip for a cutting tool has a cutting wedge defined by a first face and a first flank. The cutting wedge has a clearance angle of 0° to 3°. The first flank is produced by applying a first coating to the cutting tip and the first face is produced by applying a second coating to the cutting tip. The tool is employed for removing cuttings from a workpiece by the cutting tips and for subsequently smoothing the crack surface of the workpiece, created by removing the cuttings, by employing the first flanks.

Abstract: A bearing device for a threaded spindle has a bearing housing with at least one receptacle configured to receive a bearing part of the threaded spindle. The at least one receptacle is a clamping bushing securing the bearing part by electromechanical elements or fluid-operated elements. The clamping bushing has a wall that is elastically deformable by a pressure medium. The wall and the bearing housing define an annular chamber configured to receive the pressure medium. A control unit is provided to control the pressure of the pressure medium and thus the clamping action of the clamping bushing.

Abstract: A device for machining bores in a workpiece has a tool with a base member and cutting blades mounted on the base member for machining coaxial bores in the workpiece. At least one guide bearing for supporting the tool is provided. The at least one guide bearing has a guide bearing axis coaxial to the workpiece axis. The tool and the at least one guide bearing are shaped such that the tool is guided and centered in the machining position of the tool by the at least one guide bearing and is insertable and removable in a radial offset position from the bores and the at least one guide bearing.