**4. Conclusions**

In this study, instrumented turning experiments to assess the machinability of Inconel 718 alloy using PCBN cutting tools and two different binder phases, TiN and TiC, were selected. The primary cutting force displayed a consistent and gradual increase in magnitude as the depth of cut and feed rate increased, confirming the expected relationship between the machining process and operational conditions. In other words, the observed increase in the cutting force with an increasing depth of cut and feed rate was consistent with the predicted geometric relationship between these factors and the machining process. The following are the key findings:


**Author Contributions:** Conceptualization, A.M.P.d.J. and T.E.F.S.; methodology, T.E.F.S.; software, F.M. (Francisco Matos); validation, D.F., F.M. (Francisco Marques) and A.M.P.d.J.; formal analysis, A.M.P.d.J.; investigation, F.M. (Francisco Matos); resources, D.F. and F.M. (Francisco Marques); data curation, F.M. (Francisco Matos); writing—original draft preparation, T.E.F.S., V.F.C.S. and F.M. (Francisco Matos); writing—review and editing, T.E.F.S., V.F.C.S. and F.J.G.S.; visualization, F.M. (Francisco Marques), A.M.P.d.J. and F.J.G.S.; supervision, A.M.P.d.J. and F.J.G.S. All authors have read and agreed to the published version of the manuscript.

**Funding:** The authors gratefully acknowledge the funding from Project Hi-rEV—Recuperação do Setor de Componentes Automóveis (C644864375-00000002), cofinanced by Plano de Recuperação e Resiliência (PRR), República Portuguesa, through NextGeneration EU.

**Institutional Review Board Statement:** Not applicable.

**Informed Consent Statement:** Not applicable.

**Data Availability Statement:** The data presented in this study are available on request from the corresponding author.
