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James.

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Reply with quote  #1 
Hi all,

Here is some great VA data and images I would like to share. I think we pulled this bearing at the perfect timing 😉 

http://theseasonedanalyst.guru/2018/10/01/failure-mode-iso-15243-5-4-2-subsurface-initiated-fatigue/


All the best
James
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Reply with quote  #2 
Hi James and yes you have the same haircut as I do.

In essence i agree but if a client saw this they woukld argue it would have lasted longer.  So a bit of spalling is good. mmm  




James.

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Reply with quote  #3 
Hi John, yes my hair is getting more and more grey so I keep cutting it shorter and shorter.

I don't like pushing bearings to this type of failure but unfortunately most non VA people only understand when you pull a bearing with a good defect visible. But if it fails in service...well....that's another story!

We have pulled bearings before with microscopic damage and the asset owner says why did we pull it.... sometimes I'm sure they think we have a magic wand....

Cheers
James
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Reply with quote  #4 
Yes James you and I have met,  I do agree with you. for me though i dont pay so much importance on peakvue.  I t is just so early to call on that. mmm 
Vibe-Rater

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Reply with quote  #5 
OK then
fburgos

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Reply with quote  #6 
we have same gray hair.
JuddJones

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Reply with quote  #7 
It is hard to tell in the picture, but it almost looks like delamination. It could have been a metal defect. Is there a depression around the crack in the metal? Not sure if its a shadow, or brinelling in the crack area.
James.

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Reply with quote  #8 
Hey Big J. It looked like it was a sub surface crack coming to the surface just about to spall. Attached is the image, you should be able to zoom in on it. Cheers

 
Attached Files
bmp grab2018-06-19_10-16-10_315.bmp (3.75 MB, 22 views)

JuddJones

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Reply with quote  #9 
It is pretty straight and long for a subsurface crack coming to the surface. How much magnification was used for the picture.

Danny Harvey

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Reply with quote  #10 
It looks like it could be one edge of a larger sub-surface defect that goes on an angle away from the center.
James.

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Reply with quote  #11 
Thanks for the input.

Big J it was 120x from memory.

Cheers
James
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