In a method of machining a workpiece (60) having first and second gearings (61, 62), a reference tooth structure of the first gearing (61) is identified. The reference tooth structure is then measured with a reference measuring device (140) to determine a reference rotational angular position of the workpiece. Subsequently, the second gearing (62) is machined in such a way that the second gearing obtains a rotational angular position which is in a predetermined relationship to the determined reference rotational angular position.

In a method of machining a workpiece (60) having first and second gearings (61, 62), a reference tooth structure of the first gearing (61) is identified. The reference tooth structure is then measured with a reference measuring device (140) to determine a reference rotational angular position of the workpiece. Subsequently, the second gearing (62) is machined in such a way that the second gearing obtains a rotational angular position which is in a predetermined relationship to the determined reference rotational angular position.

Method for the grinding of a gear wheel workpiece using a dressable worm grinding wheel, wherein the worm grinding wheel is rotationally driven about a tool axis of rotation and the gear wheel workpiece is rotationally driven about a workpiece axis of rotation, and relative movements are executed between the worm grinding wheel and gear wheel workpiece, and wherein after the execution of a dressing procedure of the worm grinding wheel, which is carried out by means of a rotationally-drivable dressing unit, the following steps are carried out: executing a relative shift movement between the worm grinding wheel and gear wheel workpiece parallel to the tool axis of rotation, executing an axially-parallel relative movement between the worm grinding wheel and gear wheel workpiece in parallel or diagonally to the workpiece axis of rotation, wherein a ratio between the shift movement and axially-parallel relative movement is specified, which is variable.

A gear manufacturing apparatus for machining a gear workpiece wherein, when at least one of end regions in a tooth trace direction of each tooth of the workpiece is machined, a control device executes a specific machining control for adjusting a relative position of a tool to the workpiece based on information about the relative position computed by setting, as a machining reference position, a position of the tool on an outer edge line in an X-axis-orthogonal cross section different from a normal machining point such that a distance between a center of the tool and a center of the gear workpiece in the X-axis-orthogonal cross section when the at least one of the end regions is machined is larger than when the at least one of the end regions is machined by setting the normal machining point as the machining reference position.

A method for continuous generating grinding of at least two gear workpieces with a topologically modified grinding worm comprising a topologically modified worm region to grind tooth flanks which are topologically modified on the gear workpieces, wherein the method comprises at least the following steps: a) providing a first gear workpiece, b) performing a topological generating grinding operation by carrying out relative movements between the first gear workpiece and the grinding worm, which comprises a relative feed movement, a relative axial feed which occurs parallel or obliquely to the tool rotation axis, and a relative shift movement, c) providing the second gear workpiece, d) performing a relative jumping motion extending substantially parallel or obliquely to the tool rotation axis between the second gear workpiece and the grinding worm, e) repeating step b) for the second gear workpiece.

A method for continuous generating grinding of at least two gear workpieces with a topologically modified grinding worm comprising a topologically modified worm region to grind tooth flanks which are topologically modified on the gear workpieces, wherein the method comprises at least the following steps: a) providing a first gear workpiece, b) performing a topological generating grinding operation by carrying out relative movements between the first gear workpiece and the grinding worm, which comprises a relative feed movement, a relative axial feed which occurs parallel or obliquely to the tool rotation axis, and a relative shift movement, c) providing the second gear workpiece, d) performing a relative jumping motion extending substantially parallel or obliquely to the tool rotation axis between the second gear workpiece and the grinding worm, e) repeating step b) for the second gear workpiece.

A gear-grinding multilayer grindstone includes: a first thread-shaped grindstone and a second thread-shaped grindstone that are fixed to each other, such that the first and second thread-shaped grindstones have a rotational axis that is common to the first and second thread-shaped grindstones; and a thread-shaped groove that is provided in a first outer circumferential surface of the first thread-shaped grindstone and a second outer circumferential surface of the second thread-shaped grindstone. The thread-shaped groove extends continuously over the first outer circumferential surface and the second outer circumferential surface. The second thread-shaped grindstone is constituted by abrasive cloths that are laminated on each other, and has a higher elasticity than the first thread-shaped grindstone.

A gear-grinding multilayer grindstone includes: a first thread-shaped grindstone and a second thread-shaped grindstone that are fixed to each other, such that the first and second thread-shaped grindstones have a rotational axis that is common to the first and second thread-shaped grindstones; and a thread-shaped groove that is provided in a first outer circumferential surface of the first thread-shaped grindstone and a second outer circumferential surface of the second thread-shaped grindstone. The thread-shaped groove extends continuously over the first outer circumferential surface and the second outer circumferential surface. The second thread-shaped grindstone is constituted by abrasive cloths that are laminated on each other, and has a higher elasticity than the first thread-shaped grindstone.

A machine tool (1) for processing gears comprises a workpiece spindle (16) for driving a workpiece (18) to rotate about a workpiece axis (C1), and a tool spindle (11) for driving a tool (12) to rotate about a tool axis (B). An axial slide (7) is used to change a relative axial feed position between the tool spindle and the workpiece spindle with respect to the workpiece axis. The axial slide is guided along an axial guide direction (Z′) which is inclined with respect to the workpiece axis by an inclination angle (ψ), the inclination angle (ψ) being between 0.1° and 30°.

A machine tool (1) for processing gears comprises a workpiece spindle (16) for driving a workpiece (18) to rotate about a workpiece axis (C1), and a tool spindle (11) for driving a tool (12) to rotate about a tool axis (B). An axial slide (7) is used to change a relative axial feed position between the tool spindle and the workpiece spindle with respect to the workpiece axis. The axial slide is guided along an axial guide direction (Z′) which is inclined with respect to the workpiece axis by an inclination angle (ψ), the inclination angle (ψ) being between 0.1° and 30°.