PTFE in Wet and Dry Drilling: Two-Tier Modeling and Optimization through ANFIS

Table 5

ANOVA result of dry drilling.

Source	Sum of squares	df	Mean square	F-value	value	% contribution	Remarks
Model	2.78	9	0.3093	40.54	<0.0001	95.53	Significant
A-speed	0.2421	1	0.2421	31.74	<0.0001	8.32
B-feed	2.08	1	2.08	273	<0.0001	71.48
C-point angle	0.0541	1	0.0541	7.09	0.0164	1.86
AB	0.1885	1	0.1885	24.71	0.0001	6.48
AC	0.1144	1	0.1144	14.99	0.0012	3.93
BC	0.0136	1	0.0136	1.78	0.1998	0.47
A^2	0.0383	1	0.0383	5.03	0.0386	1.32
B^2	0.0493	1	0.0493	6.46	0.0211	1.69
C^2	0.0001	1	0.0001	0.0116	0.9154	0.00
Residual	0.1297	17	0.0076
Total	2.91	26