External turning Toolholders for ceramic inserts CN insert Selection guide for ceramic inserts Select the suitable ceramic insert and specifications from the table below: Insert shape Corner-R f (mm/rev) ap (mm) (rε) 0.10 0.15 0.20 0.25 0.30 0.35 0.40 0.45 0.50 0.60 RN – 0.3 - 4 D 2.0 SN 1.6 1.2 0.3 - 4 EN 0.8 CN 0.4 TN 1.6 1.2 0.3 - 2 DN 0.8 Chamfer 0.05 mm x 20° 0.1-0.2 mm x 20-25° 0.3 mm x 30° – Insert thickness 7.94 mm (FC250, Cutting edge angle: 0˚~15˚) D37