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Table 8.

ANOVA results for material removal.

Standard deviation 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
7.0241 3.7975 2.6609 2 1.19 0.59 12.52 44.7
X2: Discharge current
6.0418 3.8050 3.6357 2 0.4 0.2 4.25 15.5
X3: Voltage [pooled factor]
5.0477 4.5238 3.9111 2 0.071
X4: Machining on time [pooled factor]
3.7455 4.7853 4.9517 2 0.09
X5: Depth of cut [pooled factor]
4.6439 4.5539 4.2847 2 0.007
X1·X2: Interaction factor [pooled factor]
4.7444 4.717 4.0206 4 0.037
X1·X3: Interaction factor [pooled factor]
3.9816 5.051 4.4492 4 0.063
X1·X4: Interaction factor [pooled factor]
3.5357 4.779 5.1675 4 0.16
X1·X5: Interaction factor [pooled factor]
4.4524 4.722 4.3073 4 0.0098
Error 22 1.044 0.047 39.8
Total 26 2.67 100

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