Ready Steady Eddy

[EddyCurrent]

That's Fig2 then, thanks.
I also decide to get some new bearings for the blocks because the backlash on the China bearings was serious. I fitted a shim between the outer races but with the locknut fitted there was still slight play, the shim was the thickness of a Guinness can which in this application is thick. I also took a skim off the block to make sure the outer races were being clamped.

Also I'm sure I have a bent ball screw on the Y axis, it's not something I've done myself, on the last 1/3rd of it as you rotate it by hand it goes, slack,tight,slack,tight,etc. and using inside calipers between the screw and the gantry the gap goes big,small,big,small,etc. I'm not 100% yet but it might be the turned down section on the end is off centre.

I may have to get into this

http://www.roton.com/screw_shaft.aspx

[Clive S]

I also decide to get some new bearings for the blocks because the backlash on the China bearings was serious. I fitted a shim between the outer races but with the locknut fitted there was still slight play, the shim was the thickness of a Guinness can which in this application is thick. I also took a skim off the block to make sure the outer races were being clamped.

I think I remember Dean saying some time ago that the tubular spacers on the BK bearings are not always long enough and that he had made fresh ones. It is there to enable the lock nut to push the inner races together.
I might be talking crap though ..Clive