Speed and feed calc from a 1985 handbook saved my part yesterday

I plugged in the old formula from that worn out Machinery's Handbook for a 6061 job with a 3/8 end mill, it said 3500 RPM and 14 IPM, and the finish came out cleaner than anything my CAM defaults ever gave me, has anyone else gone back to the old school math when the software just guesses wrong?

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