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Objectives: In this paper the process parameters was thoroughly analysed and optimised for Die sink EDM using deionised water as dielectric on Die Steel work piece using Taguchi experimental design and Analysis of variance (ANOVA) as statistical analysis tool. Methods/Statistical Analysis: There are many methods for DOE and analysis as well as optimisation. Taguchi method is most suitable for DOE and analysis to investigate the effect of parameters. Optimal value obtained from Taguchi is further optimized. ANOVA is used to optimize the response and optimized data shows the local optimum value. Findings: Response surface roughness examined and optimal combination of input parameters are observed. It is found that TON and peak current have considerable effect on surface roughness whereas gap voltage and duty cycle can be neglected. Response is optimized using analysis of variance (ANOVA). Optimized result shows that low value of peak current and TON produces better surface roughness. Applications/Improvements: This paper supports that good surface roughness can be obtained using deionised water on Die steel. As deionised water do not produces toxic fume it can be used frequently without any measure precaution which is needed in oils and kerosene. It is also environment friendly, cheap and easy available in market.


ANOVA, Die-Sinking EDM, Die Steel, Deionizer Water, Taguchi DOE.