Analysis on Geometrical Accuracy of Microhole during Micro‐EDM of Ti‐6Al‐4V using Different Dielectrics

The present study attempts to make comparative investigation of microhole machining process in EDM for using three different dielectrics such as pure kerosene, pure de‐ionized water and boron carbide mixed kerosene and de‐ionized water. The two most important process parameters i.e. peak current and pulse‐on‐time were varied keeping other parameters as constant. The experimental results revealed that B4C mixed dielectrics result in non‐uniformly circular microholes compared to pure kerosene and de‐ionized water. Moreover, when de‐ionized water is used, powder mixed dielectric results in generation of accurate microhole with respect to taperness and circularity.