The purpose of this paper is to find economical machining speed during turning of grooves for piston rings with various feeds. In the first part of the paper, literature analysis concerning durability of cutting tools is presented. Next, the wear of cemented carbide cutting tools during turning of cast iron is researched. The research has been done for seven cutting tools. During conducted turning trials, angular speed has been altered from n=530rev/min to n=710rev/min and feeds from f=0.007mm/rev to f=0.105mm/rev. On the basis of Taylor’s equation, which relates cutting speed to tool life, the economical cutting speed is established with the application of two various methods.
 Aramesh M., Attia M. H., Kishawy H. A., Balazinski M.: Estimating the remaining useful tool life of worn tools under different cutting parameters: A survival life analysis during turning of titanum metal matrix composites (Ti-MMCs), CIRP Journal of Manufacturing Science and Technology, (2016), Vol. 12, p.35-43.
 Chen J., Liu W., Deng X., Wu S.: Tool life and wear mechanism of WC-5TiC-0.5VC-8Co cemented carbides inserts when machining HT250 gray cast iron, Ceramics international, (2016), Vol. 42, p. 10037-10044.
 Cichosz P.: Narzędzia skrawające, WNT, Warszawa 2006.
 Davoodi B.: Eskandari B.:Tool wear mechanisms and multiresponse optimization of tool life and volume of material removed in turning of N-155 iron-nickel-base superalloy using RSM, Measurement, (2015), Vol. 68, p.286-294.
 Klocke F., Klӧpper C., Lung D., Essig C.: Fundamental Wear Mechanisms when Machining Austempered Ductile Iron (ADI), Annals of the CIRP, (2007), Vol. 56/1/2007, p.73-76.
 Konig W., Zaboklicki A.K.: Laser-assisted hot machining of ceramics andcomposite materials, NIST Special Publication 847, in: Proceedings of theInternational Conference on Machining of Advanced Materials. (1993), p. 455-463.
 Krolczyk G. M., Niesłony P., Legutko S.: Determination of tool life and research wear during duplex stainless steel turning, Archives of Civil and Mechanical Engineering, (2015), Vol. 15, p.347-354.
 Legutko S., Winiarski P., Chwalczuk T., et al.: Tool life of ceramic wedges during precise turning of tungsten, MATEC Web of Conferences (2017), Vol. 94.
 Massod S. H., Armitage K., Brandt M.: An experimental study of laser-assisted machining of hard-to-wear white cast iron, International Journal of Machine Tools & Manufacture, (2011), Vol. 51, p.450-456.
 Olszak W.: Obróbka skrawaniem, WNT, Warszawa 2008.
 Ozler A.I.L., Ozel C.:Theoretical and experimental determination of tool life in hot machining of austenitic manganese steel, International Journalof Machine Tools & Manufacture (2001), Vol. 41,p.163-172.
 Qin J., Long Y., Zeng J., et al.: Continuous and varied depth-ofcut turning of gray cast iron by using uncoated and TiN/Al2O3 coated silicon nitride-basedceramic tools, Ceramics International, (2014), Vol. 40 (8), p.12245-12251.
 Wojciechowski S., Twardowski P.: The influence of tool wear on the vibrations during ball end milling ofhardened steel, Procedia CIRP, (2014), Vol. 14, p. 587-592.
 Wojciechowski S., Twardowski P.: Tool life and process dynamics in high speed ball end milling of hardened steel, Procedia CIRP (2012), Vol. 1, p.289-294.