Machining Speed and Feed
Spindle speed (RPM) from surface speed (SFM) and cutter or work diameter, plus feed rate (IPM) from the number of flutes and chip load per tooth (first-principles cutting geometry; Machinery's Handbook speeds-and-feeds method).
Formula and source
RPM = 12 * SFM / (pi * dia(in)); feed IPM = RPM * flutes * chip_load(in/tooth); 12/pi = 3.8197.
First-principles cutting geometry; the speeds-and-feeds method as in Machinery's Handbook (Industrial Press), by name.
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