Table 5.
Analysis of variance (ANOVA) for the lowest surface roughness.
| Source | DF | ADJ SS | ADJ MS | F | P |
|---|---|---|---|---|---|
| Model | 9 | 0.085467 | 0.009496 | 5.93 | 0.032 |
| LINEAR | 3 | 0.048963 | 0.016321 | 10.20 | 0.014 |
| A: Speed (m/min) | 1 | 0.047278 | 0.047278 | 29.54 | 0.003 |
| B: Feed (mm/tooth) | 1 | 0.001485 | 0.001485 | 0.93 | 0.380 |
| C: Hardness (HRC) | 1 | 0.000200 | 0.000200 | 0.12 | 0.738 |
| Square | 3 | 0.020869 | 0.006956 | 4.35 | 0.074 |
| Speed × Speed | 1 | 0.006500 | 0.006500 | 4.06 | 0.100 |
| Feed × Feed | 1 | 0.010950 | 0.010950 | 6.84 | 0.047 |
| Hardness × Hardness | 1 | 0.002955 | 0.002955 | 1.85 | 0.232 |
| 2-way Interaction | 3 | 0.015635 | 0.005212 | 3.26 | 0.118 |
| Speed × Feed | 1 | 0.000210 | 0.000210 | 0.13 | 0.732 |
| Speed × Hardness | 1 | 0.014641 | 0.014641 | 9.15 | 0.029 |
| Feed × Hardness | 1 | 0.000784 | 0.000784 | 0.49 | 0.515 |
| Error | 5 | 0.008002 | 0.001600 | ||
| Lack-of-fit | 3 | 0.003081 | 0.001027 | 0.42 | 0.761 |
| Pure Error | 2 | 0.004921 | 0.002460 | ||
| Total | 14 | 0.093469 |
Degree of freedom (DF), Adjusted Sum of squares (ADJ SS), Adjusted mean square (ADJ MS), F-test (F), Pearson value (P).