Abstract: The implementation of computerized technology within product engineering requires the use of some data bases and objective mathematical models. As very important elements, these data bases and mathematical models must also contain information regarding the roughness of the processed surfaces. This fact is important because the technological route of products depends very much on the surface roughness. In the most of the cases the surface roughness is appraised in accordance with roughness criterion Ra. The present paper presents the method that helped obtaining a mathematical model forappraising the roughness Ra of the processed surface in case of turning using wide cutting tools, more precisely in comparison with the data met within specialized literature.

Key words: roughness, modeling, CAD/CAM, technology.