I don't understand this.
You are using non paired bearings? Is it .001, ,002, .003 shim and how do you know the right number?
Many years ago we would grind and shim bearing pairs and spacers. Tenths would matter getting the preload right.
I'd buy a DUx pair.
While not as fussy as spindles do not over pack the bearings with grease. They have a cc load, buy syringes on amazon and put in the right amount.
Bob
Hey Bob.. Years ago I looked high and low for matched sets of the bearing size Fadal uses..
I could not find them.. I might not have known where to look, or whatnot, but I couldn't find them.
As for the shim.. THAT IS IMPORTANT, and its not that hard to get a shim stack that will give
you zero backlash in the bearings, yet will still last long term.. I have't replaced a single
bearing stack I've assembled personally on any of my Fadals in over 10 years.
I've bypassed the ballscrew cooling. They are big enough screws as it is. The rapids
are slower than shit, and the accelerations are like a Smart Car running on 2 cylinders.
The seals suck, and if they leak at all, they leak straight into the thrust bearings.
Back to the shims.. I've been in a rush, and just said screw it and tossed in a .005" shim.
That was a timesaver
![Rolleyes5 :rolleyes5: :rolleyes5:](https://www.practicalmachinist.com/forum/pmsmilies/rolleyes5.gif)
until a month or so later when I was buying and installing
more thrust bearings... I've also had the carrier worn out so much that I had to install
a shim on the outer race so that the carrier could clamp the bearings together properly...
If anybody cares to hear my "Hi Tech", yet not completely proper, yet good enough method
of setting the shim size, just say so.. I'm too damn tired to type it out right now.