## 4 Conclusions (and Future Work)  
The presented research aimed to analyse the impacts of trochoid parameters on the basis of the findings from our previous research on the influences of cutting parameters. After determining the influences, a mathematical-statistical prediction model was created and successfully verified based on the experimental settings.  
On the basis of experimental results of direct measurements of the components of the machining forces with the dynamometer during the trochoidal milling of the groove in steel:  
* The total machining force was measured and evaluated indirectly.
* The results of nine experiments performed for combinations of three different trochoid step settings and three different settings of the engagement angle at constant trochoid radius were processed statistically, and the predictive equation of the total machining force and the corresponding response area of the total machining force were created.
* Both the response area and the comparative regression equation of the total machining force, dependent on the trochoid step and on the engagement angle, indicate that the influence of the trochoid step is parabolic, and the influence of the engagement angle is linear with the constant radius of the trochoid.  
The limitations of the achieved model are mainly in the material and tools used, but they were chosen based on practical requirements.  
Knowledge of the predictive equation of the machining force will make it possible to decide more effectively about the settings of the input parameters of the trochoidal milling and the technological conditions of this setting. The resulting benefits of the presented results can be seen in the creation of material for further predictions; namely, for the prediction of milling cutting tool wear and the prediction of the quality of the machined surface.  
The novelty of the presented paper is the creation of a model determining the influence of trochoidal parameters on tool loading. The research outputs are intended for real deployment for the  
Figure 11: Graphical comparison of predicted and measured values of total machining force \(F\).  
setting of trochoid parameters (step and engagement angle) in order to simplify their settings in the programming phase in the environment of CAM systems. Based on the cooperation of the companies participating in the research (named in the Featured Application section), the outputs were successfully implemented in real production.  
Trochoidal milling is a method applicable to a wide range of materials, in particular, those with reduced machinability, and wherever major material removal is required in the shortest possible time. Based on the findings, it can be concluded that the prediction model obtained has the potential for further refinement for other tools and materials.  
Conceptualization A.C. and J.V.; data curation A.C. and M.S.; resources M.H. and M.B.; methodology J.V., M.S. and M.K.; investigation M.S. and M.D.; formal analysis M.S., M.K., T.C. and M.B.; funding acquisition A.C, T.C.; writing--original draft M.S, M.K, M.B.; writing--review and editing J.V., M.H. and J.K.; validation M.K., J.V. and M.H. All authors have read and agreed to the published version of the manuscript.  
This article was funded by research project APVV 15-0405 at the University of Zilina--\"Complex use of X-ray diffractometry for identification and quantification of functional properties of dynamically loaded structural elements from important technical materials.\"  
The authors declare no conflict of interest.