A method wherein by reducing the amount of current, and therefore torque, to the linear servo motor (50) and/or rotary servo motor (52) of a loader mechanism (9), the loader mechanism is operable for determining proper workpiece positioning in a machine tool such as a gear manufacturing machine, particularly a machine (4) for manufacturing bevel and hypoid gears.

A method wherein by reducing the amount of current, and therefore torque, to the linear servo motor (50) and/or rotary servo motor (52) of a loader mechanism (9), the loader mechanism is operable for determining proper workpiece positioning in a machine tool such as a gear manufacturing machine, particularly a machine (4) for manufacturing bevel and hypoid gears.

A workpiece replacing apparatus delivers a pre-machined workpiece into an intra-machine space inside a machine tool from an extra-machine space outside the machine tool, and delivers a workpiece machined by the machine tool to the extra-machine space from the intra-machine space. The workpiece replacing apparatus includes a secured cover, an arm device, and a movable cover. The secured cover is secured to a securing member of the machine tool. The secured cover defines a partition between the intra-machine space and the extra-machine space. The secured cover is provided with an opening. The arm device delivers the workpieces between the intra-machine space and the extra-machine space through the opening. The movable cover is integral with the arm device or in engagement with the arm device such that the movable cover is operable in conjunction with operation of the arm device. The movable cover closes the opening, with the arm device located in the extra-machine space.

The invention relates to a method for loading and unloading an internally toothed workpiece or a workpiece that is to be provided with internal toothing into/out of a clamping position, in which the workpiece, which is held by a retaining device, is brought into the clamping position by means of a conveying movement so that said workpiece, when clamped, has internal toothing cut by a gear cutting tool that occupies a cutting chamber and, after cutting, said workpiece, which is held by the retaining device, is returned from the clamping position in a return movement, wherein, prior to cutting, the retaining device is permitted to carry out an evasive movement that is different from the return movement/reverse conveying movement and that frees the cutting chamber, or the cutting chamber is already kept free of the retaining device as soon as the clamping position is reached.

The invention relates to a method for loading and unloading an internally toothed workpiece or a workpiece that is to be provided with internal toothing into/out of a clamping position, in which the workpiece, which is held by a retaining device, is brought into the clamping position by means of a conveying movement so that said workpiece, when clamped, has internal toothing cut by a gear cutting tool that occupies a cutting chamber and, after cutting, said workpiece, which is held by the retaining device, is returned from the clamping position in a return movement, wherein, prior to cutting, the retaining device is permitted to carry out an evasive movement that is different from the return movement/reverse conveying movement and that frees the cutting chamber, or the cutting chamber is already kept free of the retaining device as soon as the clamping position is reached.

The invention relates to a device for machining workpieces with precut teeth; having a workpiece support and at least one workpiece spindle arranged on the workpiece support for clamping a workpiece (8). A centering device (20.1) for the workpieces comprises a probe holder (30) with a centering probe (26), which operates in a contactless manner, and a base element (37). The probe holder is connected to the base element such that the probe holder has a variable radial distance to the workpiece spindle axis. The base element is designed as a slide which can be moved relative to the workpiece support. A linear guide for the base element allows a movement of the base element relative to the workpiece support. An adjustment drive for the centering device can be arranged above the centering device on a backrest of the workpiece support.

The invention relates to a device for machining workpieces with precut teeth; having a workpiece support and at least one workpiece spindle arranged on the workpiece support for clamping a workpiece (8). A centering device (20.1) for the workpieces comprises a probe holder (30) with a centering probe (26), which operates in a contactless manner, and a base element (37). The probe holder is connected to the base element such that the probe holder has a variable radial distance to the workpiece spindle axis. The base element is designed as a slide which can be moved relative to the workpiece support. A linear guide for the base element allows a movement of the base element relative to the workpiece support. An adjustment drive for the centering device can be arranged above the centering device on a backrest of the workpiece support.

The present disclosure relates to an apparatus for chamfering at least one edge of the gearing at the front side of a workpiece having internal gearing comprising at least one rotatably supported workpiece holder for holding the workpiece and comprising at least one rotatably supported tool holder for holding a chamfer hob, possibly a chamfer cut hob, wherein the tool holder is arranged at an internal hob arm whose free end can be traveled by a machine axis of the apparatus at least partly into the center opening formed by the internal gearing of the workpiece.

The present disclosure relates to an apparatus for chamfering at least one edge of the gearing at the front side of a workpiece having internal gearing comprising at least one rotatably supported workpiece holder for holding the workpiece and comprising at least one rotatably supported tool holder for holding a chamfer hob, possibly a chamfer cut hob, wherein the tool holder is arranged at an internal hob arm whose free end can be traveled by a machine axis of the apparatus at least partly into the center opening formed by the internal gearing of the workpiece.

A part-holding device includes a holding portion configured to hold an object to be held and a main body configured to detachably connected to the holding portion. The main body has a first surface, a second surface, and a third surface oriented in respective differing directions, and the holding portion has a first abutting surface, a second abutting surface and a third abutting surface capable of abutting against the first surface, the second surface, and the third surface, respectively. The part-holding device further includes pressing means configured to press the holding portion to cause the first abutting surface to abut against the first surface and to cause the second abutting surface to abut against the second surface, and fixing means configured to cause the third abutting surface to abut against the third surface and to fix the holding portion to the main body.