Quote Originally Posted by routercnc View Post
If it is a standard ballscrew I can't see how a ball bearing could escape unless the plastic return guide has broken. Wonder if the balls have jammed inside and pushed it out.

If you can do as Lee suggests and remove the ballscrew it will help identify it.
When laid out in the bench measure the diameter of the screw and then measure the pitch (distance between peaks or troughs). Also measure the diameter of the ball bearings (micrometer ideally) and take a picture of everything including the ball nut.

From the picture you have taken it does not look like the usual Chinese ballnut
Hi

I have stripped it down. The nylon washer seen in my first pic was at the bottom of the ball screw and not in the correct position and the ball bearings are from the ball nut.

I think I need to find a replacement nut.

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