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 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: The invention concerns a machine-tool, in particular a milling machine Including a machine frame; a tool carrier mounted on the machine frame for receiving a tool; a drive device for rotationally driving the tool in the tool carrier about a tool axis; a receiving device (6) mounted on the machine frame (1), for receiving a workpiece (7); a first rotary drive device for generating a first relative angular movement between the tool carrier and the receiving device and a second rotary drive device for generating a second relative angular movement between the tool carrier and the receiving device; a translational drive device for generating a relative translation movement between the tool carrier and the receiving device along three axes; a control device, which is designed in such a way that it enables to control the relative rectilinear movements between the tool carrier and the receiving device and the relative angular movement between the tool carrier and the receiving device substantially at the same time

Abstract: The hinge mount for a motor vehicle seat having a reclinable seat back comprising a wobble gear assembly which includes an internal gear and a spur gear formed integrally with the assigned hinge member by impressing a wall portion of the hinge member to such a depth that the inner surface of the impressed portion is flush with an outer surface of the hinge member and simultaneously with the precision stamping of the external or internal teeth of respective gears there are formed wall bridges in the interstices between the teeth by a continuous cold pressing process.