I thought you might be interested in this project we did back at one of our customers in 2009 testing some new tooling from ISCAR, Mastercam's adaptive machining toolpath and putting Radial Chip Thinning calculations to work cutting P20 tool steel, 1.25" diameter end mill. Heat was generated in the chips with air blast to keep them clear. Max temperature of the tool is shown in the image. You could grab the tool with you hand after machining was complete. Cool stuff.