ELECTRO-EROSIVE PROCESSING APPARATUS

In electro-erosive machining apparatuses with multidimensional relative motion between a tool-electrode and a workpiece electrode, a simple and adaptable control is provided for these relative operating movements, with a superimposed shaping-limiting control and subordinated cyclic repetitive oblique erosion. In this connection, the tool-feed is limited, within individual oblique-erosion cycles, by achieving a predetermined shaping envelope-surface. The apparatus comprises two separate coordinating-function-transmitters by means of which two operating movements, at an angle to each other, are each determinable according to a resultant relative operating movement between the tool and the workpiece, one being used for shaping-limiting control and the other for oblique erosion. Initiation of the consecutive oblique-erosion cycles is effected by means of a repetition-circuit as a function of a rated-value/actual-value approximation of the shaping-limiting control.