Open Access
Table 5
ANOVA for Surface Roughness (Ra).
| Source | Sum of squares | Degree of freedom | Mean of squares | F-value | P-value |
|---|---|---|---|---|---|
| Model | 8.496590158 | 9 | 0.944066 | 26.94014 | <0.0001 |
| A-Spindle Speed | 0.388418746 | 1 | 0.388419 | 11.08403 | 0.0076 |
| B-Feed rate | 4.278355742 | 1 | 4.278356 | 122.0884 | <0.0001 |
| C-Depth of cut | 0.009633777 | 1 | 0.009634 | 0.274912 | 0.6115 |
| AB | 2.275484445 | 1 | 2.275484 | 64.93391 | <0.0001 |
| AC | 1.48195328 | 1 | 1.481953 | 42.28946 | <0.0001 |
| BC | 7.3205E-05 | 1 | 7.32E-05 | 0.002089 | 0.9644 |
| A2 | 0.016853961 | 1 | 0.016854 | 0.48095 | 0.5038 |
| B2 | 0.016352441 | 1 | 0.016352 | 0.466638 | 0.5101 |
| C2 | 0.040735368 | 1 | 0.040735 | 1.162437 | 0.3063 |
| Residual | 0.3504 | 10 | 0.0350 | ||
| Lack of Fit | 0.1121 | 5 | 0.0224 | 0.4703 | 0.7864 |
| Pure Error | 0.2383 | 5 | 0.0477 | ||
| Cor Total | 8.85 | 19 |
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