The tools of multi-directional machining, having appeared in the recent years, have revolutionised turning operations. The chip removal of high feed roughing and finishing inserts is so specialised, that new formulas have to be introduced instead of those used so far. In this paper, the result of tests carried out up till now will be summarised; furthermore, a proposal will be made on the description, analysis and calculation of force demand of multi-directional inserts as well as the roughness of the surface being prepared during machining.
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 Ráczi V. Farkas G. Sipos S.: Chip removal specialities in multi-directional turning. Műszaki Tudományos Közlemények 9. (2018) 207–210.
 Farkas G. Sipos S. Ráczi V.: A felületképzés elemzése többirányú esztergáláskor. Int. Eng. Symp. at Banki Óbuda University 21.11.2018. Section I.
 New definitions of Turning SANDVIK Coromant (offitional ppt) 2017. 28 slides
 Palásti-Kovács B. Sipos S. Biró Sz.: The Mysteries of the Surface. First Part: The Characteristic Features of the Microgeometry of the Machined Surface Acta Polytechnica Hungarica 11/5. 5–24. https://doi.org/10.1270000/APH11.05.2014.05.1