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The electro chemical machining system is the type of system in which it is used in the machining operations. In our project we have analyse the erosion in the electro chemical machining tool. The main disadvantage of the electrochemical machining system is that, due to repeated use of electrochemical machining tool there may be occurance of erosion in the machining tool. This effect is due to the presence of oxygen content in the electrolyte. We compared different types of metal like beryllium copper, copper tungsten, copper and brass with the electrolyte combination of sodium chloride and sodium nitrate. Normally the electrolyte used in the electro chemical machining system is that the sodium chloride and sodium nitrate [5] . So that we have used to compare the metals and electrolytes and used to find the best among them. Finally we have concluded that the beryllium copper has the best results. So the use of berylliumcopperwiththeelectrolyteofsodiumchloridewill havethereductionintheerosion.