Statistical Modelling to Study the Implications of Coated Tools for Machining AA 2014 Using Grey Taguchi-Based Response Surface Methodology

Table 17

Calculation of Grey Relational Grade (GRG) values.

Exp. order	S/N ratio			Normalized S/N ratio			GRC			GRG
	MRR	Torque	Thrust force	MRR	Torque	Thrust force	MRR	Torque	Thrust force
1	13.5904	−8.1254	39.3883	0	0.415	0.2119	1	0.6584	0.7906	0.8163
2	15.0071	−10.624	37.8952	0.106	0	0	0.883	1	1	0.961
3	14.3251	−8.6854	40.2572	0.055	0.322	0.3353	0.9357	0.7129	0.7047	0.7844
4	19.1913	−9.2840	38.9182	0.4197	0.223	0.1452	0.6559	0.782	0.8464	0.7614
5	20.3848	−7.5973	37.8952	0.509	0.5028	0	0.6112	0.614	1	0.7417
6	22.1136	−7.1014	41.7719	0.639	0.585	0.5504	0.556	0.5776	0.5924	0.5753
7	25.2357	−5.3586	41.4170	0.873	0.875	0.5	0.4782	0.4776	0.6154	0.5237
8	25.9056	−4.6036	44.9388	0.923	1	1	0.4643	0.444	0.444	0.4508
9	26.9357	−7.9112	42.1122	1	0.4506	0.5987	0.444	0.6397	0.5720	0.5519
Min.	13.5904	−10.624	37.8952
Max.	26.9357	−4.6036	44.9388
Delta	13.3453	6.0206	7.0436

The larger the better–material removal rate, torque, and thrust force.