The micro-machining of electrically inert, chemically inert, hard to machine materials like glass and ceramic, can be done efficiently by a hybrid non-conventional micro-machining technique, i.e., electro-chemical discharge machining (ECDM). All the experiments, in this present work, have been conducted by an indigenously designed and developed ECDM set up. The power circuit unit is designed in such a manner that it can operates on two different power supply mode, i.e., pulse DC power supply and pure DC power supply. The current research work examined the influence of pulsating DC and pure DC power supply on the erosion of tapered tool end made of stainless steel and cupper during micro-machining of ceramics. The authors have demonstrated the optical images of the machined tool tip end and the images of sparking in both mode of power supply unit during machining. The simulated and isotherm images of surface temperature for both types of power supply have also been carried out in COMSOL multi-physics 5.6. Apart from the factors like tool–work piece gap, and tool surface texture, concentration of electrolyte during micro-machining, the factors like nature of pulse wave supply, electrical and thermal conductivity of tool also have significant role in tool wear during machining. The experimental results and the simulated images reveal that the pulse DC power supply generates periodic direct current, resulting smooth and controlled heat flux generation, whereas the pure DC supply continuous direct current, leading to generation of uninterrupted heat flux. Due to this uninterrupted heat flux, more heat supply to the work-piece, hence the temperature of the tool surface increases and more material removed from the tool surface.