Thanks to everyone for the replies. I don't have flood coolant on my CNC so I have to use a mister which doesn't get the job done. I find using a lube like oil or Accu-lube works best although it's tedious having to brush it on the tool. The endmill is in a trap cut and we've found over the years that carbide doesn't do this well. I think it's because carbide's flute can't be ground as sharp as hss/cobalt endmills. The lack of sharpness causes too much heat and the cast mat'l melts onto the tool(which is why I run slow rpms). Has anybody tried different styles of tool geometry? I was wondering if a router type bit (single straight flute) would have more room for chips? Anyone doing something out of the ordinary? TIA |