Optimization on Material Removal Rate and Surface Roughness of Stainless Steel 304 Wire Cut EDM by Response Surface Methodology

Table 8

Coefficients of estimated regression for surface roughness, Ra.

Term	Coef	SE coef	T	P
Constant	0.682524	2.10589	0.324	0.753
A	0.201951	0.03963	5.096	0.000
B	−0.00411	0.02071	−0.198	0.847
C	−0.099919	0.01431	−6.982	0.000
A A	−0.001524	0.00017	−9.011	0.000
B B	−0.000403	0.00016	−2.553	0.029
C C	0.000184	0.00003	5.286	0.000
A B	0.001104	0.00008	13.35	0.000
A C	0.000455	0.00004	10.638	0.000
B C	−0.00379	0.00004	−8.86	0.000
S	R-Sq		R-Sq (Adj)
0.02419	98.60%		97.30%