Parametric optimization of MRR and surface roughness in wire electro discharge machining (WEDM) of D2 steel using Taguchi-based utility approach

Journal of Materials Science: Materials in Engineering

Table 5 Analysis of variance based on S/N ratio values

Source	Degrees of freedom	Sum of square	Mean square	F	P	% contribution
T _on	2	406.583	203.292	407.33	0.000	63.86
T _off	2	8.25	4.125	8.27	0.003	1.141
SV	2	210.603	105.301	210.99	0.000	33.00
WF	2	0.674	0.337	0.68	0.522	–
Error	18	8.984	0.499			3.14
Total	26	635.094	24.426			100