Optimizing Cutting Conditions for Minimum Surface Roughness in Face Milling of High Strength Steel Using Carbide Inserts

Table 4

ANOVA for after removing insignificant terms.

Source	DF	Adj. SS	Adj. MS	-value	value	% contribution
Regression	7	0.473893	0.067699	68.2	0
	1	0.005935	0.005935	5.98	0.016	10.0
	1	0.102187	0.102187	102.95	0	17.2
	1	0.317063	0.317063	319.42	0	53.5
	1	0.01274	0.01274	12.83	0	2.1
	1	0.017414	0.017414	17.54	0	2.9
	1	0.011724	0.011724	11.81	0.001	2.0
	1	0.00683	0.00683	6.88	0.01	1.2
Error	120	0.119114	0.000993
Lack-of-fit	56	0.118994	0.002125	1138.02	0
Pure error	64	0.000119	0.000002
Total	127	0.593006
Model summary
-sq.: 79.91%; -sq. (adj.): 78.74%; -sq. (pred.): 77.39%