Today, our first experience of working on the material hardened to 55 HRC to be exact. Removal of surface height 0.2 mm 15 mm. We hope for good ... Parameters cutter diameter 16 - Speed \u200b\u200b1800 rpm - 8 sharp - at around 4 cemtesimi (570 mm / min). Finish with two coats cams the first roughing leaving 0.1 and then finish. All agree in G41. Distance 4 mm in a circular attack