During the EDM machining process, there are start and stop intervals called ON time and OFF time. Machining is carried out during the pulse activation time when voltage is applied in the gap between the workpiece and the electrode. Alternatively, the time during which no voltage is applied is the pulse cutoff time. A higher value of activation time is selected to obtain a long electrical discharge duration to increase the material removal rate but also leads to poor surface finish. During the pulse off time, reionization of the dielectric occurs and it is also essential to avoid any short circuits leading to wire breaks. 2.1.2 Peak current and gap voltage In WEDM, the most important machining parameter is peak current. Measured in units of amperage, this is essentially the amount of power used in WEDM. Peak current is the predefined level reached by the increasing current during each pulse. In both processes, sinking and wire EDM, the cutting surface determines the maximum amount of amperage. In roughing operations and in cavities or details with large surface areas, higher amperage is used. The supply voltage to be placed on the gap is expressed as gap voltage or open circuit voltage. The electric discharge energy is directly proportional to this value, that is, the larger the value of the interval voltage, the greater the electric discharge energy. In addition, the gap voltage and peak current also depend and the peak current increases with increasing gap voltage. In some WEDM machines, the machining voltage is indicated by these two factors.2.1.3 Servo voltage and servo feed rate:Fig.2. Feed Speed ​​and Gap Size (Roger Kern, 2008) To control the advance and retraction of the wire, a servo voltage is used. Depending on the machining state of the b...... middle of paper ...... Only a few scientific works have dealt with cutting by wires with a diameter less than 50µm. The wire materials are brass coated steel wire and tungsten having high tensile strength and melting temperatures. According to Klocke, F. et al. Typical ultra-thin wire diameters are 20, 25, 30 and 50 µm and can be used to produce micro parts with wire EDM.3. Literature ReviewDharmendra et al [4] found out the main parameters which are average cutting speed and surface roughness which affect different machining criteria. They studied the variation trend of these important machining criteria with four control factors which were studied simultaneously to establish the variation trend. Bijendra Diwakar et al[] analyzed that the metal removal rate is most affected by the pulse frequency and predicted the optimal parameter setting. with the help of Taguchi approach.