Taguchi Robust Design for Optimizing Surface Roughness of Turned AISI 1045 Steel Considering the Tool Nose Radius and Coolant as Noise Factors

Table 3

Orthogonal array with the measured Ra (µm).

Inner array				Outer array
Test run	Surface speed (m/min)	Depth of cut (mm)	Feed rate (mm/rev)	NR = 0.4 coolant: on	NR = 0.4 coolant: off	NR = 0.8 coolant: on	NR = 0.8 coolant: off
L01	150	0.75	0.15	1.8317	1.970	1.181	1.654
L02	150	0.75	0.10	1.003	1.157	0.941	1.302
L03	150	0.75	0.05	0.411	0.855	0.547	0.783
L04	150	0.5	0.15	1.588	1.530	1.171	1.231
L05	150	0.5	0.10	1.019	1.337	0.734	1.109
L06	150	0.5	0.05	0.652	1.174	0.482	0.653
L07	150	0.25	0.15	1.072	1.539	1.146	1.484
L08	150	0.25	0.10	0.925	1.416	0.820	1.393
L09	150	0.25	0.05	0.758	1.310	0.684	1.062
L10	125	0.75	0.15	1.803	2.287	1.058	2.039
L11	125	0.75	0.10	0.836	1.291	0.721	1.621
L12	125	0.75	0.05	0.514	1.000	0.612	1.351
L13	125	0.5	0.15	1.513	1.663	1.294	1.689
L14	125	0.5	0.10	1.051	1.290	1.013	1.667
L15	125	0.5	0.05	0.781	1.163	0.679	1.294
L16	125	0.25	0.15	1.621	1.780	1.235	2.576
L17	125	0.25	0.10	1.250	1.362	1.004	2.214
L18	125	0.25	0.05	1.072	1.143	0.687	1.590
L19	100	0.75	0.15	1.948	2.053	1.309	2.128
L20	100	0.75	0.10	1.167	1.828	1.163	1.978
L21	100	0.75	0.05	1.100	1.350	0.838	1.763
L22	100	0.5	0.15	1.524	1.895	1.470	2.450
L23	100	0.5	0.10	1.450	1.695	1.301	2.226
L24	100	0.5	0.05	1.398	1.445	1.000	2.145
L25	100	0.25	0.15	1.840	2.702	2.294	3.082
L26	100	0.25	0.10	1.438	2.659	1.963	2.272
L27	100	0.25	0.05	0.847	2.243	1.867	1.984