Abstract: An impulse generator for the spark erosive cutting of workpieces by electrodes of a liquid or solid medium, consists of a control circuit and a principal circuit. The control circuit contains: the control circuit contains an oscillator, reduction stages for the generation of elements which belong to the impulse signal, a counter for the addressing of impulse signal, a memory of a feedback circuit which detects the electrical conditions in the working gap, and a ROM with programmed memory locations, which are addressed by the counter according to the addresses of the impulse elements and by memory according to the addresses of the electrical conditions in the working gap, whereby the contents of the memory locations generate an output signal or no output signal. The principal circuit contains two electronic switches for the generation of a working impulse in the working gap when an output signal is present, and a control circuit which inhibits only one of two electronic counters.

Abstract: Electroerosion, spark discharge erosion is carried out by effecting a spark discharge between a jet of a conductive flowable medium forming the electrode and a workpiece. The shape of the electrode jet is imparted to the flowable medium from the nozzle at which the jet emerges at high velocity.

Abstract: A process is described whereby a workpiece is immersed in an electrode, any interlocking between the workpiece and electrode and/or damage to flanks of the workpiece is avoided, and the desired accuracy and surface condition are obtained, by turning negative flanks of a tooth through an angle .gamma. in relation to a center of the negative tooth space. A first, a second, a third and even a fourth movement may be combined with the aforementioned steps such that there is constant adaptation of the parameters of a machining generator depending on a remaining path to be covered.