Open Access
Table 11.
ANOVA results for average surface roughness.
| 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 [pooled factor] | |||||||
| 3.1398 | 4.6524 | 3.8336 | 2 | 0.127 | – | – | – |
| X2: Discharge current | |||||||
| 6.1665 | 3.0348 | 2.4245 | 2 | 0.89 | 0.44 | 3.85 | 21.5 |
| X3: Voltage [pooled factor] | |||||||
| 4.7569 | 2.6864 | 4.1824 | 2 | 0.253 | – | – | – |
| X4: Machining on time [pooled factor] | |||||||
| 4.1781 | 3.1851 | 4.2625 | 2 | 0.07 | – | – | – |
| X5: Depth of cut [pooled factor] | |||||||
| 3.6736 | 3.9190 | 4.0332 | 2 | 0.007 | – | – | – |
| X1·X2: Interaction factor [pooled factor] | |||||||
| 4.5916 | 3.638 | 3.3957 | 4 | 0.08 | – | – | – |
| X1·X3: Interaction factor [pooled factor] | |||||||
| 4.1432 | 4.078 | 3.4040 | 4 | 0.03 | – | – | – |
| X1·X4: Interaction factor [pooled factor] | |||||||
| 3.0025 | 4.223 | 4.3994 | 4 | 0.128 | – | – | – |
| X1·X5: Interaction factor | |||||||
| 2.2928 | 3.102 | 6.2308 | 4 | 0.961 | 0.24 | 2.1 | 23.5 |
| Error | 20 | 2.295 | 0.114 | 55 | |||
| Total | 26 | 4.15 | 100 | ||||
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