Open Access
Table 10.
ANOM results for average surface roughness.
| Mean 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 | |||||||
| 30.77 | 55.493 | 53.656 | 2 | 42.16 | 21.08 | 20.26 | 35.3 |
| X2: Discharge current | |||||||
| 37.373 | 47.02 | 55.526 | 2 | 18.33 | 9.16 | 8.8 | 15.4 |
| X3: Voltage [pooled factor] | |||||||
| 40.78 | 46.803 | 52.336 | 2 | 7.42 | – | – | – |
| X4: Machining on time [pooled factor] | |||||||
| 44.29 | 48.883 | 46.746 | 2 | 1.17 | – | – | – |
| X5: Depth of cut | |||||||
| 55.91 | 48.95 | 35.06 | 2 | 25.04 | 12.52 | 12.03 | 21.3 |
| X1·X2: Interaction factor [pooled factor] | |||||||
| 45.91 | 48.95 | 40.06 | 4 | 5.28 | – | – | – |
| X1·X3: Interaction factor [pooled factor] | |||||||
| 49.216 | 45.50 | 45.196 | 4 | 1.11 | – | – | – |
| X1·X4: Interaction factor [pooled factor] | |||||||
| 45.333 | 49.13 | 45.456 | 4 | 1.03 | – | – | – |
| X1·X5: Interaction factor | |||||||
| 37.606 | 47.29 | 55.023 | 4 | 16.92 | 4.23 | 4.06 | 14.1 |
| Error | 16 | 16.64 | 1.04 | 13.9 | |||
| Total | 26 | 119.20 | 100 | ||||
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