[shujaa]

Hi every one,

well attached are some pics of my cnc router

4' X 2'
steel
Bearings SBR16 LM UU Jinan Yuki
All steppers NEMA23 2.2 Nm Changzhou Soya
Dual Y 1:1 Fixed Screw Rotating Nut with HTD5M -25mm
All Screw 1605-1 Start
Z stroke 200mm
1.5 kW Han qi spindle cooled with aluminum car heater core and centrifugal pump
5 axis BoB sainsmart

HP600B daisy chained 12VX3 power suppies for 37.5VDC, 24VDC, 12 VDC, 5 VDC
Finder Control Relays
Dell Optiplex Pentium 5

Pentz cyclone DIY 3HP, blower, 6 inch flex

Attached Thumbnails

Also attaching a video of Y axis . I decreased the size and it converted to mp4. mp4 cannot be uploaded. I had to rar it to upload. Please unrar it and please do have a close look.
Fixed screw, rotating nut.
I need feedback on the movement in the ball screw. is the alignment OK ? What effect will it have on Life of Ball Nut ?
Or is it outright outrageous....

[JerryBurks]

Probably not outrageous but surely better if you can fix that. I suspect that the support bearing axes for your rotating nut are not really parallel to the screw. Maybe you can shim it?
The rotating screws of my machine are wobbling similarly due to imperfections of the (rigid) couplers but I have one end of the screw not in a bearing so the wobble does not stress it that much.

[shujaa]

Hi JerryBurks,

Thanks for the feedback. I will do something more to make it more parallel.
Thanks once again.

[shujaa]

My dear friend,

After some usage now a problem as follows has appeared.



I want to understand something about ball nuts.
there are 2 plastic rings on both sides of the ball nut. these rings are held by 2 very small screws. if i loose them and turn out the rings slightly the ball nut starts to wobble and also move along the axis on the screws by a small amount. If i turn the rings in and lock them with the screws the wobble or play is finished. I thought these were just wiper seals but it appears they have grooves matching threads and behave like a nut when rotated.



Is this normal?
Do i have now to replace the screw.
Or do i need to replace the ball nut ?
Or do I need to put in balls of a slightly larger size?
What will be the next size of balls if needed?

Best regards.

[wizard]

My dear friend,

After some usage now a problem as follows has appeared.



I want to understand something about ball nuts.
there are 2 plastic rings on both sides of the ball nut. these rings are held by 2 very small screws. if i loose them and turn out the rings slightly the ball nut starts to wobble and also move along the axis on the screws by a small amount. If i turn the rings in and lock them with the screws the wobble or play is finished. I thought these were just wiper seals but it appears they have grooves matching threads and behave like a nut when rotated.



Is this normal?
Do i have now to replace the screw.
Or do i need to replace the ball nut ?
Or do I need to put in balls of a slightly larger size?
What will be the next size of balls if needed?

Best regards.

You might want to post pics because I’m not following the description. Ball nuts vary in design so this might be a problem with the nut.