Experimental investigation of surface roughness, flank wear, chip morphology and cost estimation during machining of hardened AISI 4340 steel with coated carbide insert

Table 2 Orthogonal array L₉ of Taguchi experiment design and experimental results

Run	Coded values			Actual setting			Experimental results
Run	v	f	d	v	f	d	Surface roughness (Ra)	Flank wear (VB)
1	1	1	1	100	0.05	0.2	0.994	0.05
2	1	2	2	100	0.09	0.4	0.633	0.073
3	1	3	3	100	0.13	0.6	0.916	0.105
4	2	1	2	160	0.05	0.4	0.836	0.095
5	2	2	3	160	0.09	0.6	0.574	0.124
6	2	3	1	160	0.13	0.2	0.883	0.145
7	3	1	3	220	0.05	0.6	0.698	0.185
8	3	2	1	220	0.09	0.2	0.566	0.167
9	3	3	2	220	0.13	0.4	0.776	0.225