| ANN | Artificial Neural Networks |
| ANOVA | Analysis of variance |
| ap | Depth of cut (mm) |
| BPNN | Backpropagation neural network |
| CVD | Chemical vapor deposition |
| CNC | Computer numeric controlled |
| DOE | Design of experiments |
| f | Feed rate (mm/rev) |
| Fc | Cutting force (N) |
| Ff | Feed force (N) |
| Fp | Penetration force (N) |
| GA | Genetic algorithm |
| MQL | Minimum quantity lubrication |
| Mz | Torque (Nm) |
| MLP | Multi Layer Perceptron |
| Sku | Kurtosis of height distribution (dimensionless) |
| SOS | Sum of squares error function (dimensionless) |
| Ssk | Skewness of height distribution (dimensionless) |
| Sq | Root mean square height of the surface (µm) |
| vc | Cutting speed (m/min) |
| Vb | Flank wear (mm) |
| 2(**) | two levels |
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