OCTOBER 19-20, 2012 - YMCA University of Science & Technology

6.2 Effect of input factors on Surface Roughness
Proceedings of the National Conference on
Trends and Advances in Mechanical Engineering,
YMCA University of Science & Technology, Faridabad, Haryana, Oct 19-20, 2012
Table 4: Response Table for Signal to Noise Ratio for Surface Roughness (Smaller is better)
Level A B C D
1 -6.480 -6.800 -8.988 -8.944
2 -8.161 -9.906 -6.706 -9.143
3 -12.709 -10.644 -11.656 -9.263
Delta 6.228 3.844 4.950 0.319
Rank 1 3 2 4
Figure 4: Main effects plot for S/N ratio of Surface Roughness
Table 5: Response Table for Means for Surface Roughness
Level A B C D
1 2.247 2.505 3.105 3.022
2 2.735 3.392 2.363 3.072
3 4.377 3.422 3.850 3.225
Delta 2.090 0.917 1.487 0.203
Rank 1 3 2 4
Figure 5: Main effects plot for means of Surface Roughness
Table (6) ANNOVA Table for Mean Data of Surface Roughness
Source DOF SS MS Percentage
Contribution
A 2 9.374 4.687 26.2772
B 2 8.7634 4.3817 24.5656
C 2 8.948 4.474 25.0831
D 2 8.588 4.294 24.0739
Total 8 35.6734
It is clear from S/N plots that the max S/N ratio occurs corresponding to A 1 B 1 C 2 D 1 . Y optimal
performance + Contribution of significant factors at optimum levels
= Average
Y
optimal T + ( A1 − T ) + ( B1
− T ) + ( C 2 − T ) + ( D1
− T )
= Optimal Value of Surface Roughness = 2.343667 µm
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