“…A response surface methodology based mathematical model has been adopted to optimize various input parameters for achieving a high material removal rate and accuracy (Bhattacharyya and Sorkhel, 1999). In addition, optimizing cathode feeding directions , using W-shaped electrolyte flow , using pulsating electrolyte flow (Fang et al, 2014), using a dual pole tool (Zhu and Xu, 2002), and using low frequency vibrations (Hewidy et al, 2007) have been proposed to improve ECM surface accuracy. However, researchers have not been paid enough attention to the surface roughness when using WEMM.…”