[GITRDUN]

https://www.youtube.com/watch?v=1hRq...ature=youtu.be

Listen to the video and tell me if you have heard this before. Is this a bad ball screw nut, bad thrust bearing or support bearing?

[Geof]

I cannot answer your question despite having a VF0 that made the same noise when doing a rapid on the X axis. I hauled off all the covers and tried to identify which it was even using an engine stethoscope without any luck; the noise just seemed to come from everywhere. So I checked positioning and repeatability, and concentricity when doing circular interpolation and everything was fine and within specs. So we limited to rapids to 50% just to cut the noise and used the machine for another three years without any problems.

If your machine is still turning out good parts my advice is to wear ear plugs if the noise bothers you rather than spend several thousand dollars.

[haastec]

My money is on the thrust bearing!
I have heard that sound many many times.

[GITRDUN]

Thats what i was hoping to hear.

[haastec]

Thats what i was hoping to hear.

No guarantees mind you, but at least if the new thrust bearing does not fix it, it can still be used on X,Y or Z if/when one does go out.

Good luck and be sure to report back.