To Scott_bob

Your input of: "By the way, the feed rate is constantly changing depending on the upcoming geometry, so there would be no point in determining a single feedrate that may represent an ideal "low chatter" frequency."

Dear Scott _bob. There is no “low chatter frequency” as you speak of, that is called process dampening. Your about 90 years behind times.

In the real world there is a natural frequency and flexibility - period. These readings can be taken to determine a constant feedrate to maximize machining operatations.