Quote Originally Posted by Jonathan View Post
Misleading, you don't want tension in a CNC Router. On a CNC mill or lathe it's quite the opposite - tensioning the ballscrews is necessary if you want the best possible accuracy, however you can't do this on a CNC Router as in general the frames are nowhere near strong enough. Applying tension to the screw would just flex the frame.
Don't start Jonathan he's building a router not a Lathe or milling machine.!!

Also tensioning the ballscrew is a completley differant thing to tensioning the frame. The frame on a CNC mill or Lathe would be built in such a manner to accomadate this ballscrew tensioning but not impart tension else where on the frame so it does still apply.!!:tup: