EDM machine and simulator for an electric discharge machine

Electric discharge machine, comprising: a machining tank (5) in which is disposed a workpiece (10); a processing unit (2) having an electrode to perform electrical discharge machining of the workpiece (10); a power supply unit (3) that applies a voltage between the electrode and the workpiece (10); an NC unit (4) which controls the machining unit and the machining tank in accordance with a machining program for performing electric discharge machining of the workpiece (10); an input unit (61) to enter a form of electrode, a shape of the workpiece and a machining depth representing a depth is to be processed up to the workpiece (10); a simulator (62, 62a) that calculates a working surface (32) is obtained by overlapping a three-dimensional electrode shape and the three-dimensional shape of the workpiece (10) is projected in a plane perpendicular to a downward Z-axis, wherein the working surface (32) is obtained gradually in successive machining depths (s) until a predetermined machining depth (a3) ​​is reached, and an output unit (63, 63a) which outputs a list of data sets, each of which has the respective simulated machining depth (s) and the corresponding working surface (32).