Tool feed speeds of 400 to 1,000 ft/min (120 to 300 m/min) should be used, with angles similar to those on a singlepoint (lathe or turning) tool with a 0 to 10 negative rake angle. Good results have been obtained by hobbing plastic gears with carbidetipped hobs. Recommended tool materials are M2 and M7 highspeed steels and C2 carbide. In drilling, speeds range from 150 to 400 ft/min (45 to ...