e-Modeling and Evolution of Nanolubricant Coupled Machining Parameters Using Statistical Tool

Table 15

Confirmation test to optimize the input parameters.

Drilling parameters	Initial design	Optimal parameters
		Prediction	Experiment
	A1B3C3	A3B2C1	A3B2C1
Torque	67.43		13
Thrust force	488		147.7
Surface roughness	13.04		5.87
Ovality	0.002		0.001
Temperature	72		30
Grey relational grade	0.9323	0.5445	0.4429