Scheppert speed-dependent - approach, but not satisfactory

The first went back directly, since he was a speed-dependent "schlackerndes" noise after a 30-60 sec. First thought: can not be for the money - not the point.

Receive a replacement unit. MATCH probelm!

Have him then still retain first because too little time for further exchange and a fan was needed. `S bedroom he retires definitely! out.

Now it's summer again, have the part brought out again and put into operation.
Wow, sounds felt worse at than last year.

I then unscrewed the back cover (3 screws, then simply pry off) and checked.

It is so, that the upper bearing of the shaft in the height "wobbles". It's actually a Bronze? Sliding bearings, by passing through the axis of constant thickness. Also, the bearing fits in its inclination with the built-in suspension of the shaft.

Nevertheless, it is about 0.5mm per revolution up and down. Why has not yet fully developed. This forms appear after a short time a resonance that goes to the whole body and is really unpleasantly loud.

Now have the upper retaining plate (4 Phillips screws) solved and fixed easily moved again.
(As part of the game of the screw holes in the plate). So much so that the bearing has the lowest possible runout. For this, the bearing oiled slightly. (For fats I should have expanded it completely. If perhaps).

Result: Scheppert still, but only about half as loud as before. Upper bearing still has slight radial runout. Still not for the office, certainly not to use ..and for the bedroom. In louder music or TV, it is unbearable.

I am clearly of the opinion that such a thing is absolutely out of the question for such an expensive "luxury unit".
Since I know considerably more favorable tower fans, where you can just listen to the wind.

The only plus points: The appearance and the IR-FB

Therefore, only one point.

Sorry AEG, but that can not it be !!