International Journal of Manufacturing Engineering / 2014 / Article / Tab 5

Research Article

Material Removal Rate, Electrode Wear Rate, and Surface Roughness Evaluation in Die Sinking EDM with Hollow Tool through Response Surface Methodology

Table 5

The analysis of variance for main and interaction effects of parameters on EWR.

SourceSSDOFMS valueProb > At 95% CI% contribution

Model170.14534.0323.50<0.0001Significant
A114.761114.7679.24<0.0001Significant70.39
B2.6412.641.83 0.20373.25
C1.3611.360.94 0.35310.94
B211.69111.698.07 0.01610.09
BC39.69139.6927.40 0.0003Significant0.39
Lack of fit13.1971.882.75 0.1725Nonsignificant
0.9144
Adjusted 0.8755
Predicted 0.7301

CI: confidence interval; DOF: degrees of freedom; MS: mean sum of squares; SS: sum of squares.

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