Hi Hoyt,

I have had time now to fully digest your ideas. I now have a few questions
regarding your ballscrew mounting scheme. I drew a picture of what I think
you are discribing. The key feature is that the shim is larger than the
inner races but smaller than the outer races of the two identical
ballbearings, correct? (I hope I am using the word "race" correctly. The way
I am using it means that each bearing has two races. So two bearings have
four races total.) I understood that you used just regular bearings. The red
arrows represent what I think the preloading forces are.

Does the attached drawing show what you were discribing?

Could the shim be a regular washer?

What type of bearings do you suggest? The more specific you can be the
better for when I go bearing shopping.

How much axial and longitudinal play is there in the final set up?

Why not use thrust bearings like the ones that came stock on my mill/drill?
Does your system have any advantages over thrust bearings? There is quite a
bit of axial play in my setup. This may be the answer or mine might not be
preloaded correctly.

Why not use angular thrust bearings like the expensive pre-assembled NSK
mounting plates use? I assume NSK uses them for good reason. I don't know
how much single angular thrust bearings cost, do you?

How do you generate the preload forces? Something must be squeezing the
ballscrew threaded part towards the mounting plate, correct?

Do you have any more information about CNCv239 that you can send me? I read
you website and would like to read some more.

I appreaciate your help!

Thank you,
Peter