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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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