Open Access

Table 10.

ANOM results for average surface roughness.

Mean by factor level (dB)
Degree of freedom (DoF) Sum of square (SS) Mean square (V) Value of F calculated Contribution percentage P%
1 2 3
X1: %wt. CNT
30.77 55.493 53.656 2 42.16 21.08 20.26 35.3
X2: Discharge current
37.373 47.02 55.526 2 18.33 9.16 8.8 15.4
X3: Voltage [pooled factor]
40.78 46.803 52.336 2 7.42
X4: Machining on time [pooled factor]
44.29 48.883 46.746 2 1.17
X5: Depth of cut
55.91 48.95 35.06 2 25.04 12.52 12.03 21.3
X1·X2: Interaction factor [pooled factor]
45.91 48.95 40.06 4 5.28
X1·X3: Interaction factor [pooled factor]
49.216 45.50 45.196 4 1.11
X1·X4: Interaction factor [pooled factor]
45.333 49.13 45.456 4 1.03
X1·X5: Interaction factor
37.606 47.29 55.023 4 16.92 4.23 4.06 14.1
Error 16 16.64 1.04 13.9
Total 26 119.20 100

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