College of Aeronautics, (Cranfield)2016-10-212016-10-211963-11http://dspace.lib.cranfield.ac.uk/handle/1826/10813Tools of grade N35/RD80 and S1P were tested at 600 fpm cutting speed, 0.010 in.rev. feed and 0.10 in. depth of cut to 0.030 in. flank-wear. The results showed that the grade S1P gave a tool life between six and seven times greater than grade N35/RD80 together with less crater wear.enReport