Abstract: An electrical discharge machining apparatus including a workhead (10), which is transportable sideways out of a work area defined by a setup plate (23). The workhead (10) includes a chuck (11), which is adapted not only for the carrying of an electrode (110) for the processing of a workpiece mounted on a pallet (100), but also for carrying a transport gripper (120). The transport gripper (120) serves to grab the pallets (100) and to deliver these or as the case may be, to remove these from the work area (23). The electrodes (110) and the pallets (100) are magazined on a plate changer (30), which is integrated in the machine bed immediately adjacent to the work area (23). The normally provided CNC-controller (40) must only be modified slightly, so that the workhead (10) serves not only for the processing, but also for the changing out of electrodes (110) and pallets (100). The until now conventional, separate robot can thus be completely dispensed with.