[padobranac]

Sounds like a built in sensor needs adjustment, thats if it uses one.

That would be an sensor for reference of spindle?

Where this sensor should be, inside of the motor?

Manual adjustment (moving) or with parameters?

What does your spindle load meter read when you head the buzzing sound?

There is no spindle load meter on operator panel.
Maybe this could be seen in some parameter/diagnostic? 0M, I doubt.

Try lower rpm.

Tried, again same thing.
I tried lower and higher RPM,and also changed feed.
Buzzing is all the time the same.

[underthetire]

If it's the built in sensor, it should be on top of the spindle. It will have a fine pitch toothed wheel with a small pickup sensor. When those start to fail, or the adjustment gap is set wrong, the motor will buzz during rigid tap and orientation. Then you will start to get sensor alarms on the drive.

[padobranac]

If it's the built in sensor, it should be on top of the spindle. It will have a fine pitch toothed wheel with a small pickup sensor. When those start to fail, or the adjustment gap is set wrong, the motor will buzz during rigid tap and orientation. Then you will start to get sensor alarms on the drive.

Thank you for your answer, BUT:
- I don't get any alarms, since now (may be in the future)
- during the orientation (M19), there is no buzzing heard

"the adjustment gap is set wrong"
That is in some parameter?