We all have manufacturer speed & feed charts and have used their recommendations.
But sometimes those charts just don't apply.
For example manufacturer charts assume you are using their endmills at a certain stickout length, flute length and at a certain depth of cut.
But in the real life you rarely match all these conditions.
Sometimes you need to use longer endmill. Sometimes your flute is longer than what manufacturer gave you speeds and feed for.
What i am trying to say is that whenever your real life conditions differ from "normal" you "need to adjust accordingly".
In fact this is what is printed below many charts.
Too bad not many sources tell you how and what to adjust.
While failure to adjust cutting parameters often leads to chatter, poor surface finish and even tool breakage, one of the biggest mistakes people do when machining isRead More