Investigation of Drilling Parameters Using Grey Relational Analysis and Response Surface Methodology of Biaxial Glass Fibre Reinforced with Modified Epoxy Resin Composite

Table 4

ANOVA analysis for circularity.

Source	DF	Seq SS	Contribution	Adj SS	Adj MS	value	value
Model	13	0.256581	79.58%	0.256581	0.019737	9.29	0
Linear	4	0.093656	29.05%	0.127721	0.03193	15.03	0
Thickness	1	0.010347	3.21%	0.012988	0.012988	6.11	0.019
Drill bit	1	0.018212	5.65%	0.034247	0.034247	16.12	0
Feed	1	0.045643	14.16%	0.07398	0.07398	34.83	0
Speed	1	0.019454	6.03%	0.020088	0.020088	9.46	0.004
Square	3	0.137807	42.74%	0.136883	0.045628	21.48	0
Drill bit  drill bit	1	0.039647	12.30%	0.058714	0.058714	27.64	0
Speed  speed	1	0.092445	28.67%	0.093571	0.093571	44.05	0
Thickness  feed	1	0.01357	4.21%	0.011942	0.011942	5.62	0.024
Error	31	0.065849	20.42%	0.065849	0.002124
Total	44	0.322431	100.00%
S	R-sq	R-sq (adj)	PRESS	R-sq (pred)
0.0460888	79.58%	71.01%	0.131806	59.12%