Test report no. PLBO/7 evaluation of PERPRO tools grade RD 92 machining EN 9
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College of Aeronautics, (Cranfield)
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Four tips of RD 92 were tested at 600 fpm cutting speed, 0.010 in./rev. feed and 0.10 in. depth of cut to 0.030 in. flankwear. Two tips gave a tool life of 56 min., but with severe crater wear. The other two tips gave a shorter life - one failing after 30 min. cutting as a result of the breakdown of the crater lip.