Quote Originally Posted by Steven W View Post
When I went above 40mm/sec there was like chatter marks on the cut edge. Is this due to the feed speed being too fast for the cutter speed or is it that the cutter is getting blunt. I have never seen this before
This could be a combination of things.? Basicly what it's showing you is the limit of your machines strength.
The main issue will be a combination of Z axis strength or extension if overly extended and cutter extension from spindle. Then there's the machine structure it's self. . . .This is why I asked before to see a picture of machine to get a gauge of how well it's designed and built.