Face Mill With Round Inserts

[the penguin]

(11-18-2016, 09:15 PM)TomG Wrote: I think you have it backwards Jack. A round insert has more edge in contact with the work. I used a fly cutter once that had a round insert and could not get it to stop chattering at any speed on anything more than a light cut.

Tom

Thats why I'm asking, I've never used any type of cutter with round inserts. I was thinking if you set the cutter on a piece of metal, it only touches on the point on the edge of the insert. But after reading your response, it appears I forgot the depth of cut, which would alter the contact area dramatically.

thanks, Tom