21 14 th International Research/Expert Conference ”Trends in the Development of Machinery and Associated Technology” TMT 2010, Mediterranean Cruise, 11-18 September 2010 CORRELATION RESEARCH OF CUTTING FORCES DURING TURNING Avdi Salihu 1 , Hakif Zeqiri 1 , Avdyl Bunjaku 2 Nexhat Qehaja 2 , Azem Kyqyku 2 1) University of Prishtina, Faculty of Applied Technical Science Fabrika e akumulatorëve, pn. 40000 Mitrovicë Kosovë 2) University of Prishtina, Faculty of Mechanical Engineering Kodra e diellit, pn. 10000 Prishtinë Kosovë ABSTRACT In this paper are given experimental results during turning for material C45 and X12CrNi 18.8 (DIN). Turning has been made on a universal lathe PERVOMAJSKA NILES TVP-250 by using coated plates CNMG 12048 made in Sweden. The measuring has been done with dynamometer type FS1, where as a researching method was used a method of statistics with three factors. Keywords: chip, lathe, forces and dynamometer 1. INTRODUCTION In order to realize the processing with cutting it is necessary the cutting tool to act in the piece of processing material. During this activity, for the reason of chip plastic deformation, incoherence of chip from the material of processing piece, friction between front surface of cutting tool and chip as well as by friction between back surface of cutting tool and processed surface, appear cutting forces. The resultant F R in the common occasion of processing is spatial and it can be stripped in three normal components, one with the other Fig 1[2]. Figure 1. Cutting force during turning These components are: tangential force Ft which acts on the front flat of surface and fits in the direction of cutting speed, tangential force Fr is perpendicular with the ax of processing piece and tangential force as well as axial force Fa that fits in the subsidiary movement direction with the