Quote Originally Posted by big_mak View Post
Fergie,

What kind of cutter are you using? Solid or Inserts? If it's an insert tool you may have a tip not seated properly if it is what you describe, or your endmill may not be running 100% if it's solid. Just trying to rule everything out before you go and pull the machine apart!
I'm using a solid carbide endmill, but i'd (maybe wrongly) ruled out the cutter and spindle as all of the 'flats' line up with each other on each z-level pass. I would have thought this would be unlikely if it was cutter/splindle related?