3 flute high helix endmills are meant to be used in a climb cut. Conventional cutting with one will tend to force chips to the bottom of the tool where they get recut several times before being ejected. The end-grind of a center cutting 3 FL EM is very difficult since all 3 flutes have to be ground perfectly. I would suggest a high quality carbide endmill. Also if you run the endmill at 10K rpm your feed can be much higher, more like 125 to 150 IPM. Never had this problem with carbide tools, never tried high speed.
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