Due to the high thermomechanical loads in machining processes, an appropriate cutting edge preparation is crucial for achieving longer tool life and good surface finish. Given the high mechanical properties of tool materials, abrasive processes have been used to produce rounded and chamfered edges. Among these processes, brushing stands out due to its flexibility, low cost, and ability to provide efficient edge preparation, allowing the obtaining of specific edge geometries through the correct selection of process parameters. Brushing also offers a controlled and consistent way to optimize the cutting edge, minimizing the risk of defects or excessive wear. However, the correlations between these parameters and the final geometry are associated with the brush-insert contact conditions and must be obtained experimentally. In this study, ground cemented tungsten carbide cutting inserts ISO grade P10 were brushed on an adapted mechanical lathe using a brush with nylon filaments impregnated with SiC abrasives. From the obtained results, it was concluded that penetration depth and inclination angle are the main factors influencing the microgeometry configuration along the main cutting edge and the nose radius. These findings highlight the importance of precise parameter control in optimizing edge preparation for enhanced tool performance.