An optimisation of micro-EDM operation for fabrication of micro-hole

Micro electro-discharge machining (micro-EDM) operation is a versatile operation to machine any hard conducting material to fabricate micro-products of different shape and size. The micro-holes are a common feature in many micro-products. It is a challenging task to improve the surface integrity and aspect ratio of holes. A number of controlling parameters affect the micro-EDM operation. In the present investigation, the optimization of micro-EDM operation has been carried out for fabrication of micro-holes using design of experiment technique using the Taguchi method. The circularity error, the recast layer and machining time has been analysed. The significant factors influencing the process have been found out. The workpiece is taken as copper and the tool is tungsten electrode.