Abstract: A grinding machine including an electric drive with a drive wheel, wherein the electric drive is arranged on a base unit of the grinding machine, a grinding spindle unit constructed as a grinding arm arranged removable on the base unit and which includes a grinding tool and a gear element which transmits the rotational movement of the drive wheel to the grinding tool. To facilitate the change of the grinding arm, the gear element includes: a driver which is supported on the grinding spindle unit and which is directly or indirectly in rotary union with the grinding tool, two guide wheels which are supported on the grinding spindle unit and a belt which is guided around the driver and the guide wheels, wherein in the mounted state of the grinding spindle unit at the base unit the drive wheel contacts the belt between the two guide wheels and hereby drives the same.

Abstract: A method for dressing a grinding worm using a dressing roll that engages the grinding worm to profile its helical grinding profile. The dressing roll is produced by: a) producing a disk-shaped base body a profiled surface for receiving a layer of abrasive particles, wherein the surface is at least partially tooth-shaped in a radial cross section, b) positioning the abrasive particles on the profiled surface, c) profiling the base body provided with abrasive particles by removing outer sections of the abrasive particles with a profiling tool so that the abrasive profile of the dressing roll is created. Production of the profiled surface takes place in step a) so that the distance between the profiled surface and the abrasive profile changes during advancing from the root region to the tip region at a flank of the tooth-shaped surface, measured in the radial cross section perpendicular to the profiled surface.

Abstract: A method for dressing a grinding worm using a dressing roll that engages the grinding worm to profile its helical grinding profile. The abrasive profile of the dressing roll is at least partially tooth-shaped in a radial cross section and extends radially from a root region to a tip region. The dressing roll is produced by: a) producing a counterpart having an inner surface; b) positioning and fixing a layer of abrasive particles on the tooth-shaped surface; c) producing a disk-shaped base body of the dressing roll and connecting the base body with a carrier layer for the abrasive particles; d) demolding the base body; e) profiling the base body. Step a) includes providing the counterpart with the surface so that the distance between the profiled surface and the abrasive profile changes during advancing from the root region to the tip region at least at one flank of the surface, measured in the radial cross section perpendicular to the profiled surface.

Abstract: A method for hard fine machining of the toothing of a gear that has an axis of rotation, wherein the toothing is machined with a hard fine machining tool. The machining tool rotates around an axis of rotation during hard fine machining. The method includes: a) Providing a hard fine machining tool that has axially adjacent machining zones, including a first zone for the grinding the toothing and a second zone for fine grinding and/or polishing the toothing; b) Grinding the toothing with the first zone, wherein a first pivoting angle exists between the axis of rotation of the gear and the axis of rotation of the machining tool; c) Fine grinding and/or polishing the toothing with the second zone of the machining tool, wherein a second pivoting angle exists, which is different from the first pivoting angle, between the axis of rotation of the gear and the axis of rotation of the machining tool.

Abstract: A method for the dressing of a multi-thread grinding worm by a dressing roll, wherein the grinding worm has at least two screw channels which are arranged parallel to another, which screw channels extend helically around an axis of the grinding worm and wherein the dressing roll has at least two adjacent dressing profiles which are arranged along an axis of the dressing roll, wherein the dressing profiles of the dressing roll are guided simultaneously through adjacent screw channels of the grinding worm during the dressing of the grinding worm.

Abstract: A method for the dressing of a multi-thread grinding worm by a dressing roll, wherein the grinding worm has at least two screw channels which are arranged parallel to another, which screw channels extend helically around an axis of the grinding worm and wherein the dressing roll has at least two adjacent dressing profiles which are arranged along an axis of the dressing roll, wherein the dressing profiles of the dressing roll are guided simultaneously through adjacent screw channels of the grinding worm during the dressing of the grinding worm.

Abstract: A grinding arm for grinding workpieces with an inner profile with a grinding wheel. The grinding arm has a tube-shaped base body with a longitudinal axis, in which the grinding wheel is supported at one axial end region. A first drive for the grinding wheel is arranged in its other axial end region. A first transmission system transmits the rotation from the first drive to the grinding wheel. In order to adjust arbitrary angles of inclination of the grinding wheel in the grinding arm, the grinding wheel is arranged on a grinding spindle driven by the first transmission system and rotating around an axis of rotation. The grinding spindle is supported in a carrier body arranged in the base body rotatable around an axis perpendicular to the longitudinal axis as well as perpendicular to the axis of rotation, wherein the axis of rotation and the axis intersect.

Abstract: A gear or profile grinding machine and a method for operating such a machine, especially for grinding of pre-geared or pre-profiled workpieces, wherein the machine includes at least one tool spindle which can receive at least one grinding tool, and at least one workpiece spindle which is movably arranged at a carrier element and which can be driven up to the tool spindle for an at least temporary cooperation of the workpiece with the grinding tool by at least one drive. To enhance the precision of the machine at growing workpieces with simple measures, at least one mass is arranged at or in the carrier element, which is arranged movable at or on a guiding element by a drive element, wherein the mass is permanently free from any contact with another machine part and/or workpiece part and/or tool part.

Abstract: A method for hard fine machining of a workpiece with a worm-shaped cutting tool, wherein the workpiece has a profiling along its circumference. The cutting tool has a machining surface. A hard machining process of the profiling is carried out at simultaneous synchronized rotation of the workpiece around its axis and of the cutting tool around its axis with given meshing of the machining surface into the profiling by moving the cutting tool in the direction of the axis of the cutting tool. A shift movement is superposed to the cutting tool in the direction of the axis of the cutting tool during the hard machining. The shift movement includes at least one first section at which the cutting tool is moved in one of its axial directions and of at least one second section at which the cutting tool is moved in the other of its axial directions.