[TauRunUM]

This is example of wto box:
https://www.wto-tools.com/fileadmin/...354e305aa9.jpg

After power outage, box making strange noise. Tools are working normal (same surface quality and hold measures). We did remove all live tools, strange noise remain so it isn't becuase of tools.

Box is driven by smaller fanuc red cap motor alphaiS 8/4000HV

So we are puzzled what could be. Fanuc motor or transmission inside of box?

We are not clear what type of transmission it is, I think geared belts it sound logical to me and I think I saw on some Tornos factory video they use similar Fanuc motor and belts to drive live tools. But I also know that Haas use gears for driving multiple live tools.

So what you guys think, is it Fanuc motor and what type of transmission box have?

We can't stop production right now, we will when new swiss came to shop which will take over job but it would be good to have clue what to expect.

[freakycnc]

Does the same noise occur if you run the tools in the opposite direction?
I've had similar situations where the servo amplifier was not firing correctly in one direction (+) but OK in the opposite (-) direction.