Waveform monitoring of electric discharge machining by wavelet transform

The waveform affects the quality and mechanical performance of a workpiece during electric discharge machining (EDM). This study uses the wavelet tp t ransform to process the waveform of EDM. The data of the waveform are obtai ned from the voltage and current between the workpiece and the electrode of the electric discharge machine, and are then calculated by the wavelet tra nsform. The outcome shows that after the transformation the original data c an easily identify the different machining condition, thus, providing clear and useful information for the on-line control of EDM.