Joseph Gwinn wrote:

The guy that did the experiment showing a max speed of ~20,000 rpm for
whatever reason did not achieve full speed, as 20,000 rpm isn't nearly
enough, and yet people have no problem causing bearings to burst from
overspeed.

Basically, it all fits together. Then it bursts.

Think of rotation as the average motion and resonant acoustic vibration
as the instantaneous motion. The stress from the maximum vibration
excursion can be much greater than that from the rotation.

--
Fred R
"It doesn't really take all kinds; there just *are* all kinds".
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