Just a small correction to my last post:
Chip per tooth =3D CPT. The CPI given above is erroneous. Stupid computers:-)).
Vernon, when you are up-and-running and dulled or burned a few endmills, get back to us and ask about the correct cutter rpm for a given machining set-up.
The spindle rpm is not a guess and by gum figure but bears a definite relationship to materials of cutter & work piece, and their diameter; the tool dia. in case of mill and drill press, the work dia. in case of lathe, (vertical or horizontal).
Wolfgang