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

Table 6

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

Source	SS	DOF	MS	value	Prob >	At 95% CI	% contribution
Model	53.68	7	7.67	550.62	<0.0001	Significant
A	46.37	1	46.37	3329.21	<0.0001	Significant	86.17
B	2.42	1	2.42	173.75	<0.0001	Significant	4.49
C	2.38	1	2.38	170.61	<0.0001	Significant	4.42
A^2	0.52	1	0.52	37.30	0.0002	Significant	0.96
B^2	0.91	1	0.91	65.02	<0.0001	Significant	1.69
C^2	1.05	1	1.05	75.20	<0.0001	Significant	1.95
BC	0.081	1	0.081	5.83	0.0389	Significant	0.15
Lack of fit	0.034	5		0.29	0.8937	Nonsignificant
	0.9977
Adjusted	0.9959
Predicted	0.9921

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