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Plain bearings in orbit

Looking for the term to describe a noisy bearing

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Sam Stones	04/04/2012 00:06:21
922 forum posts 332 photos	Gentlemen, What is the term usually used to describe the condition when a shaft begins to whirl or orbit (instead of sliding smoothly), inside a plain bearing? It’s a noisy condition which is often cured with just a drop of oil, or a new bearing with a better fit. Regards, Sam
Springbok	04/04/2012 02:11:02
879 forum posts 34 photos	Shafted...!!
Doddy	04/04/2012 09:24:50
72 forum posts 103 photos	Eccentricity may manifest itself as shaft to bore mis alignment (STBM) and/or dynamic run out (DRO). Even with a good oil supply, high speed turbine shafts can suffer "oil whirl" leading to major vibration issues Eccentricity and dynamic run out a usually due to mis alignment, more a "sloppy fit" in this case
Ian S C	04/04/2012 12:35:53
7468 forum posts 230 photos	The term here would be "Munted", which is another way of saying "stuffed". Ian S C
Nicholas Farr	04/04/2012 20:36:26
3988 forum posts 1799 photos	Hi Sam, maybe it could be termed as Axial Oscillation. Regards Nick.
blowlamp	04/04/2012 21:16:08
1885 forum posts 111 photos	Could be Oil Whip, Whirl or Bearing Flutter. Martin.
Bazyle	05/04/2012 01:10:17
6956 forum posts 229 photos	The correct term is "Precession". A secondary definition to the more common association with gyroscopes and planets.
Stub Mandrel	05/04/2012 22:03:02
4318 forum posts 291 photos 1 articles	In my workshop I call that a 'precision running fit' Neil
Ian S C	06/04/2012 08:43:05
7468 forum posts 230 photos	Sounds like the big end on some of my hot air engines, I just call it free running, sometimes it does get a bit extreme, one did get to .020" on a 1/4" crank, Brass bush very little wear, unknown grade steel pin took all the wear. Ian S C

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