the servo motor 112 of the feed mechanism 110 serves as u201c slave u201d in the inventive apparatus the known mechanical coupling between the spindle of the machine tool and the advance mechanism is replaced by an electronic coupling this electronic coupling is effected by means of the controller 160 with the given program wherein the parallel operation of both servo motors 132 and 112 is of utmost importance particularly in the start and stop phases with the apparatus as described the tooth pitches can be continuously varied this is accomplished by defining in the given program the period called cycle length in millimeters over which the variation is to take place and by specifying the size of the incremental difference per tooth in the variation pattern of the tooth pitch for the manufacture of different saw toothed wires by means of the apparatus shown in fig 1 one only has to change the parameters of the tooth pitch in the given program and if necessary to swivel the spindle relative to the feed mechanism 110 and possibly to exchange the blanking tool 140 by means of the apparatus shown in fig1 it is possible to produce saw toothed wires of variable pitch of the kinds shown in fig2 a to 2 c each of these saw toothed wires 10 has a foot portion 12 with a plurality of teeth 14 that are arranged consecutively.