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dnk

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Reply with quote  #16 
One thing to be careful of is split roller bearings have little tolerance for under size or out of round. Something I check on every split bearing I install.
MarkL

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Reply with quote  #17 
Hi Danny, these are mainly 3' shaft units and haven't had that issue, it's mainly raised gE demos levles, well raised in comparison to others I've tested, averaging 16-25 gE. But like I said tends to be a raise don't noise floor.

Here's a question whilst on the subject of coopers, with the design of them, where would you guys suggest placing the accelerometer? I have always been placing mine on the shoulder of the bearing cassette as I though the housing body was too far away regards signal degradation.

See image attached.

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dnk

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Reply with quote  #18 
I mount the same way you do. Never had a problem.
Danny Harvey

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Reply with quote  #19 
Mark,

I have gotten the best results from there too. I try to find whatever is either the closest in proximity to the bearings and/or has the fewest number of elements for the high frequency energy to pass through.  The theory is that some is reflected at each surface making the number of elements more critical than the distance.

That said, a bearing tech from Cooper told me years ago (this may have changed since then) that they do not even consider acceleration when evaluating their bearings.  In their opinion, the "robust construction" of their bearings made early detection techniques that rely on high frequency signals irrelevant.  They looked for 1 ips overall and harmonics of defect frequencies in the velocity spectrum.

It's hard to argue with their results but if careful attention is not paid to proper application and installation, high frequency techniques can extend the life of this type of bearing for years by making sure that it is right from the start.  My guess is that the same thing applies to the OP's question about split sphericals.


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