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Fig.6. Experimental set-up to determine the optimal spherical grinding parameters
Table 2 summarizes the measured ground surface roughness alue Ra and the calculated S/N ratio of each L18 orthogonal array sing Eq. 1, after having executed the 18 matrix experiments. The average S/N ratio for each level of the four actors is shown graphically in Fig. 7.
Table2. Ground surface roughness of PDS5 specimen
Exp. Inner array
(control factors) Measured surface
roughness value (Ra) Response
no A B C D
S/N(η(dB)) Mean
1 1 1 1 1 0.35 0.35 0.35 9.119 0.350
2 1 2 2 2 0.37 0.36 0.38 8.634 0.370
3 1 3 3 3 0.41 0.44 0.40 7.597 0.417
4 2 1 2 3 0.63 0.65 0.64 3.876 0.640
5 2 2 3 1 0.73 0.77 0.78 2.380 0.760
6 2 3 1 2 0.45 0.42 0.39 7.530 0.420
7 3 1 3 2 0.34 0.31 0.32 9.801 0.323
8 3 2 1 3 0.27 0.25 0.28 11.471 0.267
9 3 3 2 1 0.32 0.32 0.32 9.897 0.320
10 1 1 2 2 0.35 0.39 0.40 8.390 0.380
11 1 2 3 3 0.41 0.50 0.43 6.968 0.447
12 1 3 1 1 0.40 0.39 0.42 7.883 0.403
13 2 1 1 3 0.33 0.34 0.31 9.712 0.327
14 2 2 2 1 0.48 0.50 0.47 6.312 0.483
15 2 3 3 2 0.57 0.61 0.53 4.868 0.570
16 3 1 3 1 0.59 0.55 0.54 5.030 0.560
17 3 2 1 2 0.36 0.36 0.35 8.954 0.357