The only method to use is experience with a mix of Manufacturer Recommendations and Feel.
What are you cutting?
Mild Steel, Hard Steel, Stainless, Aluminum, Titanium?
What Tool type?
Single point Lathe tool, or End Mill?
What type of Setup; Vise, Fixture, Lathe Chuck, Hard or Soft Jaws?
All these Variables and more have to be considered when Machining.
As a rule of thumb if you get chatter or squeeling turn the RPM down Gradually in 5%-10% increments or the Feedrate Up until the cutter is Happy. You will develope a feel and know when a cutter and Machine is Happy.
My opinion on Chatter or Squeeling: It is the Cutter (on a Mill) or the Bar (in a Lathe) bouncing instead of Cutting. Hence you have to find the Sweat Spot or Optimal Feeds and Speeds in a given application.
I hope this Helps you.
:cheers:
Toby D.
"Imagination and Memory are but one thing, but for divers considerations have divers names"
Schwarzwald
(Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)
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