Optimization on Material Removal Rate and Surface Roughness of Stainless Steel 304 Wire Cut EDM by Response Surface Methodology

Table 9

Variance analysis for surface roughness, Ra.

Source	DF	Seq-SS	Adj-SS	Adj-MS	F	P
Regression	9	0.413512	0.413512	0.04592	78.52	0.000
Linear	3	0.109886	0.03622	0.012134	20.63	0.000
Square	3	0.087207	0.10881	0.036395	61.99	0.000
Interactions	3	0.21642	0.21642	0.072064	123.29	0.000
Residual error	10	0.005851	0.005851	0.000573	-	-
Lack of fit	5	0.004096	0.004096	0.000807	2.33	0.187
Pure error	5	0.001755	0.001755	0.00034	-	-
Total	19	0.419363	-	-	-	-