I need a cutting tool geometry explanation

metalmadness · Feb 12, 2020

Hey all, Ive been in this industry for over 10 years and worked in multiple shops. My old boss didn't have a very good explanation of this question.

Can someone explain what the term "free-cutting" means, specifically when it comes to cutting tools? (i already understand what free-cutting steel is, yes.)

It is typically found in hi-feed style cutters and I assume it is the fact that the lead angle is negative. Or is it the rake angle? Or both?

Thanks in advance!

Larry Dickman · Feb 12, 2020

sorry, not sure I can answer your question, but "Free Cutting" seems to be what my customers think I do.

DavidScott · Feb 12, 2020

Typically more rake and relief, but what really matters is less cutting force. A corncob mill is free-er cutting than a finish mill, of the same geometry. An endmill for aluminum is free-er cutting than one designed for steel, etc...

5 axis Fidia guy · Feb 15, 2020

"Free cutting" would be more of a positive rake, some ball endmill makers have an "S" shape on the nose with a positive grind, for more "free cutting", or so they claim.

litlerob1 · Feb 15, 2020

I believe at one time it was a reference to a cutter that requires less HP. Whatever that means, as far as Geometry goes, I don't know.

Of late though; I think it's on the shelf next to the Aerospace grade Aluminum, and the Titanium knives, the Pure Billets are on the bottom.

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I need a cutting tool geometry explanation

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