CBN Machining Applications – Where is CBN Machining Cost Effective? “Hard Turning” Tool Steels 55Rc to 65Rc+ Speeds of 200 SFM to 600+ SFM (Surface Feet per Minute) Chip loads of .001 to .020 IPR (Inch per Revolution) Depth of cuts .001 to .200" Finishes to 10-Ra+ Interrupted cuts – NO Problem Solid-top CBN inserts eliminate the problem of Mini-tip Melt-Off Chilled Cast Irons (as cast) & Grey Cast Irons NiHard (White Iron) 450 Bhn to 750Bhn     300% Increased productivity vs. carbide Wear life 5 to 10 times TiN coated carbide 200% wear life in finishing cuts vs. ceramics Speeds start at 600 SFM to 3000+ Chip loads .004 to .020 IPR Depth of cut .002" to .375" Operations include turning, milling and boring Speeds range from 250 SFM to 400+ SFM Roughing chip loads .002" to .015" IPR Roughing depth cuts .002" to .375" Finishing cuts, chip load starts at .001 to .020" IPR Finish cuts, depth of cuts .001 to .300" Operations include turning, milling and boring Acme threading both ID & OD Milling of lathe rails, 63Rc tool steel Rock crushing bowls, 1700 mm diameter Ni-Hard, 60Rc Hard turning continuous cuts, up to 150% improved tool life