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.

LevelTaguchiLinear regressionQuadratic regression
ExpPred% ErrorExpPred.% ErrorExpPred.% Error

Ra (um)
Optimum0.560.527.140.560.4617.850.560.6312.50
Random0.720.659.720.720.731.380.720.731.38
Cp (kW)
Optimum415.2408.61.59415.2386.576.89415.2473.7313.91
Random401.4418.34.21401.4448.7411.79401.4454.0313.2