Z axis Leadscrew play

[Smackre]

When we got this used machine. It has almost 1/4 of play in the spindle between the Y and Z axis. Well after taking it apart i noticed the rails where loss. And i also noticed it needed new rails. So i bought them. Replaced them. i also noticed the Z axis leadscrew was locked up. So i took it all apart and replaced the bearings in it. Well i put it all together today. Its running great. All the slip in the Z and Y axis are gone. But some reason there is still about .01" play in the leadscrew. I think i got the problem found. The leadscrew is mounted with a single 10mmX26mm bearings at the bottom. Just a standerd bearing. The top has 2 10mmX26mm bearings at the top. And the leadscrew has a nut at the top. So its bolted to the top 2 bearings.

So here is the problem. the top two bearings are just standerd bearings. Which are not made for side force. Hence where the place is coming from. So here is what i ask you guys. Is there a better type of bearings i can get that is more for side force?

Now i need to be able to mount this bearings in the same housing these are in. So they gotta be 10mmX26mm. The 2 bearings i have now are .626 put together i believe. So its gotta be close to that debth.

Thanks Eric,

[ViperTX]

Well...I suspect that the problem is really between the leadscrew and the nut on the leadscrew.....is this ACME or Ballscrew??

[Smackre]

im not sure. it dont look like either. its not a ballscrew or a acme screw. it looks more like a standerd thread. but it looks more smooth than thread. im not sure.

[Mr.Chips]

Originally Posted by Smackre im not sure. it dont look like either. its not a ballscrew or a acme screw. it looks more like a standerd thread. but it looks more smooth than thread. im not sure.

Can you send a picture of the screw?

Is the play coming from the bearings or lead screw?

[Smackre]

i can see the leadscrew moving up and down. so its not in the leadscrew. its either the bearings or the nut aint down tight on the bearings. and im 99% posative its not the nut. i took the leadscrew out and the nut was tight on the bearings.

[ViperTX]

Well then in that case.....it's a problem with the lack of pre-loading of the bearings....

[Smackre]

Ok anyone know where i can get 10mm I.D. X 26mm O.D. X 16mm Double Row angular contract bearings. Or two 8mm single contact angular contact bearings?

[ravin]

hello Eric
which controlse u r using? if u hv play in z axis ball screw or not
u can compensate

Ravin.

[ravin]

hello eric i am online so u can discuess with me now in the chat room