## 5 Conclusions  
Tool and machining cost reductions can be achieved by developing the current state of the tool and cutting element design, cutting materials, and optimizing machining conditions. This article presents a new way to re-create the cutting properties of cutting continuous edges with an arc-shaped cutting edge in orthogonal cutting. This is accomplished by using a selective exchange of the worm cutting edge--SEWCE. The scope of commercial  
Figure 20: Example of SEWCE area for the developed tool (\(r_{\varepsilon}=1.5\) mm) for \(z=10\) and \(a_{\text{p}}=0.4\) mm.  
round inserts with a large radius of \(\tau_{\varepsilon}\) (2.5 to 16 mm) and a specially developed tool with \(\tau_{\varepsilon}=1.5\) mm is analyzed in this article. The following items are the article's main findings for edges with a curved cutting edge:  
* The overall contact between the edge and the workpiece includes a fragment defined by angle \(2\alpha\), which shapes the roughness of the machined surface through geometric and kinematic mapping of the edge (GKME) and part described by the \(\beta-\alpha\) angle, which removes the machining allowance \(\mathrm{a_{p}}\).
* The equations presented show that fragment \(2\alpha\) depends on feed rate f and radius of the cutting edge \(\tau_{\varepsilon}\) (Equation (2)), while part \(\beta-\alpha\) depends on the depth of cut \(\mathrm{a_{p}}\) and the radius of the cutting edge \(\tau_{\varepsilon}\) (Equation (3)).
* We consider two boundary possibilities for opening the cutting properties of an edge: complete replacement of the edge contact by rotating the edge through an angle \(\delta=\alpha+\beta\), and in the GKME area by rotation \(\delta=2\alpha\). The area between these strategies is referred to as the SEWCE area. Reducing the edge radius \(\tau_{\varepsilon}\) significantly reduces the theoretical number of edges i.
* Calculations of the theoretical number of edges i indicate that a very high number of edges is obtained, especially for strategy \(\delta=2\alpha\), while preliminary results available in the literature indicate that a higher value of \(\delta\) angle rotation is needed due to edge wear in the theoretical contact.
* This paper presents an original solution for a tool with an circle-shaped cutting edge using a cylindrical cutting element with radius \(\tau_{\varepsilon}=1.5\) mm. This creates additional application possibilities for surface machining in comparison to marketed round inserts with larger \(\tau_{\varepsilon}\).
* By using this new tool, the possibility for applying the SEWCE effect and, in addition, the possibility for reusing the cutting element by resharpening the rake surface by up to 20x was achieved. In this way, the possibility for obtaining a large number of edges has been achieved despite using a small radius for the cutting edge \(\tau_{\varepsilon}\).
* The issue presented opens a new area of research in terms of exploring the possibility for a considerable increase in tool life using the application of the SEWCE effect for edges with a continuous cutting edge and by application of a cylindrically shaped insert. Future research should cover wear, machinability indexes, and the search for new design solutions.  
Conceptualization, T.M. and T.P.; methodology, T.M. and T.P.; software, T.M. and T.P.; validation, T.M., T.P., M.K., A.D.P. and R.B.; formal analysis, T.M., T.P., M.K., A.D.P. and R.B.; investigation, M.K., A.D.P. and R.B.; resources, T.M., T.P., M.K., A.D.P. and R.B.; data curation, T.M. and T.P.; writing--original draft preparation, T.M., T.P., M.K., A.D.P. and R.B.; writing--review and editing, T.M., T.P., M.K., A.D.P. and R.B.; visualization, T.M. and T.P.; supervision, T.M. and T.P.; project administration, T.M. and T.P.; funding acquisition, T.M. and T.P. All authors have read and agreed to the published version of the manuscript.  
This research received no external funding.  
Not applicable.