Quote Originally Posted by Jonathan View Post
If you compare the errors due to the screw grade to other errors in the system (e.g. due to the ballscrew and associated stiffness's), your conclusion will likely change.
The Boy cum-eth Man just said what I was eluding too.! . . . . .Screw grade will be the least of your troubles.
Also let me just say forget having a Router and milling machine in one they just don't play well together, very very difficult to achieve and keep your sanity. Even then the result will still fall short of average milling machine or Router.!!

Keep it simple do one or the other and save your self some dissapointment.