Nowadays composite materials are used in many industrial areas. The main application of these is the aircraft industry. Problematic points with machining of composite materials are tool wear, tool life and temperature during machining of polymer composite materials. In the first part of this investigation, the tool wear of sintered carbide (SC) with AlTiN coat milling tools in various cutting conditions has been studied. The second part deals with the problem of cutting temperature during machining of GFRP composite materials in different cutting conditions. In the end, the results illustrated in graphs and figures were evaluated.