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Table 3.

ANOVA results for material removal rate based on S/N ratios.

S/N 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
315.37 381.69 370.43 2 279.87 139.93 7.75 28.6
X2: Discharge current
388.18 362.41 316.90 2 289.54 144.77 8.02 29.6
X3: Voltage
331.15 378.21 358.13 2 123.90 61.95 3.43 12.7
X4: Machining on time [pooled factor]
347.35 364.01 356.13 2 15.42 7.71
X5: Depth of cut [pooled factor]
366.76 348.38 352.35 2 20.78 10.39
X1·X2: Interaction factor [pooled factor]
358.21 344.4 364.79 4 23.84 5.69
X1·X3: Interaction factor [pooled factor]
349.91 350.2 367.30 4 21.92 5.48
X1·X4: Interaction factor
356.59 365.9 344.96 4 24.53 6.13 0.34 2.5
X1·X5: Interaction factor
364.89 339.4 363.19 4 45.1 11.27 0.62 4.6
Error 12 216.54 18.04 22
Total 26 979.62 100

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