Re: [CAD_CAM_EDM_DRO] How does one adjust Ballscrews on a Bridgeport

Stephen Wille Padnos wrote:

>
> Hi, all.
>
> Both myself and a friend are having the same issue with our Bridgeport
> milling machines. We're both converting manual machines to CNC. I
> installed new ballscrews (his machine came with ballscrews), and they
> feel "springy". If I lock the table and push the handwheel, it turns a
> little (around 8-10 mils, according to the dials). If I let go, it will
> spring back to where it started. It gets harder to push (like a
> spring), until eventually I overcome the table lock friction, and the

Some of the cheaper setups use non precsion screws and space two ball
nuts apart with Bellville washers to get the "preload". They act as you
describe, springy to compress the washers then more solid to move the
table. Not good if you are CNCing it or think you can climb mill with
it. Ed.