The spark eroder is constituted from a rack that encloses the central processing unit of drilling with the adapted local power source of discharge that supplies a pulsed discharge to one tip (anode) that discharges the energy through a dielectric liquid to gasket (the cathode). A microcontroller manages the advance of the tip and, controlling the level of discharge, through feedback, he allows the same one to be left over until completed drilling.A PC monitor allows to control the alignment of the parts, tip and gasket, and it allows to visualise the ended work. The apparatus has a heart-leakage protection through an isolation transformer.