WIDIA™ • Inserts for Machining Aluminium Non-Ferrous Materials • Miscellaneous Workpiece Materials Additional cutting speed recommendations for miscellaneous workpiece materials Copper-, Brass-, Zinc-Based on a Machinability Index Range of 70–100 speed — m/min Starting Conditions Material Group grade 250 500 750 1000 m/min HCK10 275 N4 HWK10/HWK15 260 Nylon, Plastics, Rubbers, Phenolics, Resins, Fibreglass, and Glass speed — m/min Starting Conditions Material Group grade 250 500 750 1000 m/min N5 HCK10 275 Carbon and Graphite Composites: Brush Alloys, Kevlar, and Graphite (280–400 HB) (30–43 HRC) speed — m/min Starting Conditions Material Group grade 250 500 750 1000 m/min N6 HCK10 200 MMCs (Aluminium-Based Metal Matrix Composites) speed — m/min Starting Conditions Material Group grade 250 500 750 1000 m/min N7 HCK10 170 Tin Alloys, Cast: ASTM 823, Alloys 1, 2, 3, 11 speed — m/min Starting Conditions Material Group grade 250 500 750 1000 m/min HCK10 215 N8 HWK10/HWK15 180 widia.com B153