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

Table 7

Optimum machining conditions at each noise-factor combination.

Test run	Surface speed (m/min)	Depth of cut (mm)	Feed rate (mm/rev)	Tool nose radius (mm)	Coolant	Measured Ra (µm)	Predicted Ra (µm)	(%) Error	Screen shot from surface roughness tester
1	150	0.75	0.05	0.4	On	0.440	0.455	3	Figure 6(a)
2	137	0.62	0.05	0.4	Off	0.866	0.848	2	Figure 6(b)
3	150	0.25	0.05	0.8	On	0.552	0.541	2	Figure 6(c)
4	150	0.64	0.05	0.8	Off	0.752	0.737	2	Figure 6(d)