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Table 6.
ANOVA results for electrode wear ratio 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 | |||||||
| 77.29 | 37.03 | 15.30 | 2 | 219.86 | 109.90 | 27.82 | 63.9 |
| X2: Discharge current | |||||||
| 57.08 | 38.79 | 33.76 | 2 | 33.45 | 16.72 | 8.46 | 9.8 |
| X3: Voltage [pooled factor] | |||||||
| 42.13 | 46.75 | 40.73 | 2 | 2.20 | – | – | – |
| X4: Machining on time [pooled factor] | |||||||
| 47.80 | 39.07 | 42.76 | 2 | 4.26 | – | – | – |
| X5: Depth of cut [pooled factor] | |||||||
| 46.28 | 38.68 | 44.66 | 2 | 3.550 | – | – | – |
| X1·X2: Interaction factor | |||||||
| 33.24 | 51.99 | 44.39 | 4 | 19.77 | 4.94 | 1.25 | 5.7 |
| X1·X3: Interaction factor [pooled factor] | |||||||
| 44.68 | 48.24 | 36.70 | 4 | 7.72 | – | – | – |
| X1·X4: Interaction factor [pooled factor] | |||||||
| 43.99 | 41.24 | 44.39 | 4 | 0.65 | – | – | – |
| X1·X5: Interaction factor [pooled factor] | |||||||
| 42.16 | 44.52 | 39.56 | 4 | 2.27 | – | – | – |
| Error | 18 | 71.17 | 3.950 | 20.6 | |||
| Total | 26 | 344.32 | 100 | ||||
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