Research Article
Material Removal Rate, Electrode Wear Rate, and Surface Roughness Evaluation in Die Sinking EDM with Hollow Tool through Response Surface Methodology
Table 4
The analysis of variance for main and interaction effects of parameters on MRR.
| | Source | SS | DOF | MS | value | Prob > | At 95% CI | % contribution |
| | Model | 364.25 | 6 | 60.71 | 43.10 | <0.0001 | Significant | | | A | 293.43 | 1 | 293.43 | 208.33 | <0.0001 | Significant | 57.19 | | B | 22.82 | 1 | 22.82 | 16.20 | 0.0024 | Significant | 11.97 | | C | 12.40 | 1 | 12.40 | 8.80 | 0.0141 | Significant | 0.03 | | A2 | 13.14 | 1 | 13.14 | 9.33 | 0.0122 | Significant | 3.25 | | AB | 8.29 | 1 | 8.29 | 5.89 | 0.0356 | Significant | 6.65 | | BC | 14.18 | 1 | 14.18 | 10.06 | 0.0099 | Significant | 10.97 | | Lack of fit | 12.31 | 6 | 2.05 | 4.62 | 0.0801 | Nonsignificant | | | 0.9628 | | | | | | | | Adjusted | 0.9404 | | | | | | | | Predicted | 0.8179 | | | | | | |
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CI: confidence interval; DOF: degrees of freedom; MS: mean sum of squares; SS: sum of squares.
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