Process for machining a spur gear by means of a rotating gear-like tool

A process for machining the teeth of a rotating gear workpiece by means of at least one rotating worm-shaped tool which can be moved toward engagement with the workpiece and upon reaching the desired distance between the axes of the tool and workpiece will rest against the workpiece with the ratio of the revolutions corresponding to a basic revolution ratio resulting from the ratio of the number of teeth of the workpiece and tool, comprising radially feeding said tool having a curved tooth thickness smaller than the final measurement of the width of the curved tooth gap of the workpiece to be produced relative to said workpiece until the desired distance between said axes is reached without contact and subsequently performing a controlled relative circular feed movement comprised of an additional rotating movement of one of said workpiece and tool which is superimposed on the corresponding basic revolution so that at least one flank of each tooth of said workpiece is machined, said circular feed movement being continously measured during the machining operation and stopped upon reaching a predetermined feed angle.