Another 60/40 post

[jimbo_cnc]

I did this same thing today, but different conclusion.

First off, I can just about push my main axis carriage along the ballscrew. BUT (others will tell me if I'm wrong here) being able to push along the ballscrew shows how very low friction they are. The fact that a little more preload on the bearing stops this, does not mean a big problem, what is important is how easy it is to turn the ballscrew.

Anyway, I had been plannig to take the balls out of my ballnut (from the videos eddy pointed out), but I decided that the axis felt OK mechanically and now I think that it is a driver problem.

For info, at the motor end there is a floating bearing. At the other end are 2 standard roller bearings which take the load in either direction.


edit: just noticed you were talking about 6040 X axis, not British. My cross axis is easier to push than the long axis, as it should be given the lower inertia. Doesn't change what I wrote above about my machine, but you may well have an alignment problem with yours.