Todays Project - What did you do today?

[Highpower]

(12-21-2015, 11:03 AM)Sunset Machine Wrote: Guessing:  It looks like the end of the cutter has made full contact, causing chatter. Not enough relief, the endmill has slipped in a collet, or there's a lot of flex in the mill. The full circle here is saying something:

Yes, the inserts basically sit flat against the work. I tried drilling through a thin piece of steel when I first got the cutter and stopped because of all the racket it made. http://www.metalworkingfun.com/thread-28...l#pid48450

The inserts definitely sit at different heights and the outer one does most all the cutting as far as I can tell. I'm thinking it's probably a combination of the mill slipping in the collet, and the Chinese cast iron made from noodles in my mill.

If a skim cut with HSS doesn't smooth things over, the next stop will be the blast cabinet.