The paper presents a study on the performance of non-coated solid cemented tungsten carbide (WC) router cutter when milling oak wood. The tests were done with the oak wood samples. The samples were milled in the CNC milling router. The samples were milled at three different milling modes. The measured micro-geometrical parameter was the width of cutting edge. Actual values of cutting edge width were measured by optical method using optical microscope and digital microscopy camera. Width of cutting edge was measured in the established steps of cutting length. The received images were processed and measured using the computer software. The results are presented in the form of summaries and diagrams.DOI: http://dx.doi.org/10.5755/j01.mech.23.3.18482