| Notation | |
| AISI | American Iron & Steel Institute |
| ANOVA | Analysis of variance |
| HRC | Hardness measured with the Rockwell test for hard materials |
| CAM | Computer-aided manufacturing |
| RSM | Response surface methodology |
| CCD | Central composite design |
| MRR | Material removal rate |
| SS | Sum of squares |
| MS | Mean square |
| VMS | Vision measuring system |
| d.f. | Degree of freedom |
| Symbol | |
| C | The trochoidal step refers to the distance between the centers of adjacent paths or revolutions (mm) |
| A | Cutting speed (m/min) |
| B | Feed rate (mm/tooth) |
| Ra | Surface roughness (μm) |
| Xi | Estimated output response |
| xi | Input parameter |
| d0 | Free term of the regression equation |
| di | Coefficients of linear terms |
| dij | Coefficients of square terms |
| ∈ | Experimental error |
| d1, d2,…dn | Coefficients of linear terms |
| X1 | Before machining the tool |
| X2 | After machining the tool |
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