Comprehensive Expression of Durability for the Selected Cutting Tools in Comparison with Standard ISO 3685

Durability of cutting tool defines lifetime of this cutting tool and it determines its suitability for select technological operation. Technical science defines a lot of different factors, that they may be cause of shorter cutting tool lifetime. Some types of cutting materials are defined by means of descriptions in standards ISO, some types by means of catalogues from the manufacturer. There are a lot of types of cutting materials they have not been defined theirs properties exactly yet and theirs properties have to be defined on experiments. There is a presumption that descriptions in standards ISO are not correct and these standards have to be examined and verified, because that this fact have to be confirmed or disproved. Accuracy and completeness technical standards ISO are very important part quality of manufacturing. Only correct standards ISO should be used like instruction, or tool for manufacturing process of companies. The article describes process how to define and analytically express durability dependence for selected cutting tools, specifically high speed steel (HSS), cutting ceramic (Al₂O₃) and sintered carbide (P20+TiN).