Apparatus for the manufacture or machining of gears by rolling on a tool having abrasive working surfaces

In an apparatus for the manufacture of straight or helically toothed workpieces using at least one toothed tool having abrasive working surfaces and which roll alternately with single-flank contact on a workpiece, the relative position between said workpiece and tool, during this rolling movement, being controlled by a tooth system of a guide gear means which also rolls with a single-flank contact, the contacting tooth flanks of said guide gear means being the counter-flanks of a workpiece-tool pair, said apparatus including first adjusting means for changing the contacting tooth flanks by rotation of a member of said workpiece-tool pair relative to at least one member of said guide gear means, and a pair of stops for limiting the amount of relative rotation between said workpiece-tool pair and said guide gear means, the improvement comprising wherein a first of said pair of stops limits the extent to which contact of finish worked tooth flanks on said workpiece occurs on the corresponding tooth flanks of said tool and said counter-flanks of said guide gear means, and a second of said pair of stops limits the extent to which relative rotation occurs between said workpiece-tool pair and said guide gear means to control finish working of the counter-flanks of said workpiece and the contact of the flanks of said guide gear means, and second adjusting means for selectively adjusting the magnitude of and the relative position between said relatively rotatable workpiece-tool pair and said guide gear means.