Research Article
Optimization of Surface Quality and Power Consumption in Machining Hardened AISI 4340 Steel
Table 8
Predicted values and confirmation test results by the Taguchi method and regression equations.
| Level | Taguchi | Linear regression | Quadratic regression | Exp | Pred | % Error | Exp | Pred. | % Error | Exp | Pred. | % Error |
| Ra (um) | Optimum | 0.56 | 0.52 | 7.14 | 0.56 | 0.46 | 17.85 | 0.56 | 0.63 | 12.50 | Random | 0.72 | 0.65 | 9.72 | 0.72 | 0.73 | 1.38 | 0.72 | 0.73 | 1.38 | Cp (kW) | Optimum | 415.2 | 408.6 | 1.59 | 415.2 | 386.57 | 6.89 | 415.2 | 473.73 | 13.91 | Random | 401.4 | 418.3 | 4.21 | 401.4 | 448.74 | 11.79 | 401.4 | 454.03 | 13.2 |
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