College of Aeronautics, (Cranfield)2016-10-202016-10-201963-11http://dspace.lib.cranfield.ac.uk/handle/1826/10805Tools of grade N35/RD25 and N35/RD80 were tested at 500 fpm cutting speed, 0.010 in/rev feed and 0.10 in. depth of cut on EN 9 to 0.030 in. flankwear. The results showed that there was no significant difference in tool life between the two grades for the cutting conditions investigated.enReport