Modding Hoss' Z axis for chinese ballnuts

[Hutkikz]

Been lurkin & learnin since I picked up a "basketcase" X2 last year. Didnt have a clue then and know just enough to be dangerous now. I figured I had better run this by the experts before I muck it up.
i wanted to redesign Hoss' z axis to work with the chinese ballnut I will be using. and here is what I came up with.



It uses the same timing pulley that Hoss used just bored to fit over the ballnut, my concern is that the setscrews for the pulley and lock collar will deform the ballnut housing?
I'm also not sure if my double ballnut design is proper, the lock collar would be set screwed to the first ballnut and the 2nd ballnut would float between the tangs with bellville washers inbetween How many degrees of rotation would be needed?
I also added AC bearings from vxb speading them further apart because the pulley is a longer distance from the bearings.
I greatly appreciate any advice and will be starting a build thread soon as I'm sure I'll be needing much more help as I go along.
Les

[Hutkikz]

could use a little direction

[hoss2006]

Looks awful beefy for an X2, where does it mount to the mill? particularly the z axis ballnut mount.
Hoss

[Hutkikz]

I should of dimensioned it.
I started with your prints and dimensions so it mounts same as yours, I just mounted the pulley on the ballnut instead of the other way around. Then made the shaft on the ballnut mount 35mm (about 3mm larger) to match the ac bearings. at the time I was thinking I needed to spread the bearings apart because I raised the pulley, but its only 10mm higher so I will bring the length down from whats shown.
I then had the idea for the double ballnut but I'm sure I dont completely understand how to set one up yet. the real intention was simply to use your z axis set up with the chinese ballnut and I probably got a little carried away.

Since the table on this mill is damaged and I have the materials Im going for something like Rods first x2 using the grizzly H7659 table. I should also mention that a recent trade with a local machinist is what is allowing me to skip the originally planned for manual phase.

So I guess the real question is can the pulley be mounted to the ballnut like this? maybe there is room to bolt it the ball nut flange?

Thanks,
Les

[hoss2006]

Looks like you could run some socket screws up thru the ballnut mount (C-bore the holes for flush fit)
and up thru all into your lock collar.
Hoss