The article presents the impact of cutting inserts with coatings on the roughness of the milled surface. Two types of coated steel inserts were selected for the research purpose. The first one was covered with Ti (C, N) + Al2O3 coating, while the other was TiC / TiN-CVD and Ti (C, N) + Al2O3. They were then mounted in a milling head. The process of surface milling has been subjected to C45 steel. Milling process for each inserts proceeded at the same rate of cutting. After a certain number of tool passages, the measurements of wear parameters and the roughness of the milled surface were measured. This allowed us to determine the effect of tool wear on the properties of the milling face layer.Keywords: wear of cutting inserts, milling, roughness, coatings
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