Abstract: A method and a machine for the discontinuous generating grinding with indexing of the tooth flanks (14) of gears. The rotating grinding wheel (T) carries out several back and forth feed movements (X) from one axial side face of a tooth to the other. The gear (W) is rotated a small amount (rolling step s) at each change of direction point and the grinding wheel (T) is adjusted in the axial direction (rolling stroke .DELTA.Z). To produce corrections on the tooth flank (14), the grinding wheel can, during the feed movements (X), carry out additional lifting movements (.DELTA.K) in direction of the rolling stroke (.DELTA.Z).

Abstract: A method for the precision working of tooth flanks of hardened workpiece gears (W) utilizing a gear-shaped or rack-shaped tool (T) suited therefor, the tooth flanks (5) of which tool (T) having an abrasive surface, for example a CBN-coating. If such a tool carries out a feed movement relative to the workpiece to be machined, which feed movement is directed perpendicularly to the common normal, however, not in direction of the workpiece axis (4) (i.e. a diagonal feed), then it is important to choose the tool width (b.sub.

Abstract: A method for the precision working of crowned tooth flanks of particularly hardened gears with a two-flank abutment and at crossed axes with an abrasive gear-shaped or rack-shaped tool, in which the tool carries out several back and forth feed movements relative to the workpiece in a direction X extending at an angle .epsilon. inclined with respect to the workpiece axis 4 and a plunge feed movement in the sense of a center-distance reduction. The tool does not have corrected teeth. The crowning is created only at the end of the precision working during at least one back and forth feed movement without a plunge feed movement.

Abstract: Apparatus for the manufacture or machining of straight of helically toothed gears with a hyperboloidally or globoidally or similarly formed toothed tool, which has an abrasive or similar surface and which has such an axial dimension that it covers the entire width of the workpiece tooth system. The axes of the workpiece and the tool cross and the workpiece and the tool are coupled to a guide gearing. The workpiece-tool pairing and the guide gearing each have their own (separate) crossed-axes point. Interchangeable gears can be provided between the workpiece-tool pairing.According to a different embodiment, the axis of the guide gearing and the workpiece axis are arranged parallel to one another, also to another axis of the guide gearing and the tool axis. The parallel axes are coupled to one another through master gears and interchangeable gears.