What Causes High RPM Bearings to Suddenly Vibrate and Slow Down?

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High RPM bearings can vibrate and slow down suddenly due to a phenomenon often referred to as "Rotor Whirl" or "Dry Whirl," which occurs when the bearing is loose and lacks lubrication. This vibration, characterized by a pulsing effect, leads to a grinding noise and a significant loss of spin. The discussion highlights that this issue can arise in various applications involving dry bearings or spools. Understanding the causes of this vibration is crucial for maintaining optimal performance in mechanical systems. Proper lubrication and bearing tension are essential to prevent these issues.
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When I spun a dry bearing or even toy car in high rpm it can suddenly vibe and slow down while making grinding noise... sudden loss of spin. I suppose this is because the bearing is rather loose and then vibe (like pulsing vibe) thus slowing it down. What does this vibe effect called? This can happen in basically anything that has dry bearing or spool.
 
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I think it's called "Rotor Whirl", "Dry Whirl" or "Dry whip". Something like that.
 
Maybe "chatter."

Chet
 

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