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Vibe-Rater

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Hi All,

Looking at a wind turbine gearbox at the moment and there are some INA.FAG bearings in there which I can't find the fault frequencies for. (I don't have pcd's, number of rolling elements and angles)

In the past I had a link to a database through the INA/FAG web site which I now can't find. Trouble with ever changing web sites and something like this so deeply buried.

Any help appreciated.  If any one has the fishing rod I can fish myself and save the time at your end. rgds
Sinski

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Reply with quote  #2 
I am going to ask the obvious and ask if you actually tried the current FAG/Schaeffler website? It should still include INA bearings if thats what you are looking for. I do have a contact at Schaeffler if you get desperate.

John from PA

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Reply with quote  #3 
Try http://medias.schaeffler.com/medias//hp.  If you use Google Chrome a pop up will occur asking if you want to translate.  Probably a good idea unless you speak German or use the box at top right to select English.

By the way, some wind turbine bearings aren't going to be listed.  Main rotor asymmetric roller for instance isn't in any database to my knowledge.
Vibe-Rater

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Sinsk, I have to admit it I didn't.  I contacted an old office collegue you know who works for Schaefller or however you spell it. I'll look. rgds.

John, I did anaughty and had a look at the old forum and saw a link from you.  I'll try the above link now. rgds
Vibe-Rater

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Reply with quote  #5 
Hi John,  your link works and was the same as in the old forum. Theres a drop down to select English.  a quick look and I cant find ff's.  Will keep looking. Thanks rgds
MichaelS

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Reply with quote  #6 
When I strike out looking for FFs on the interwebs, I call our local bearing distributor. More often than not, they are able to get me the info. They have some contacts.

Just a thought. Good luck.
Vibe-Rater

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Reply with quote  #7 
Sinsk, next week 3 days at your old stamping ground. Then another 3 days stint 2 weeks later.  Then potentially on going repeat pattern until they find recruits.... will be fun. I'll keep in touch. rgds
John from PA

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Quote:
Originally Posted by Vibe-Rater
Hi John,  your link works and was the same as in the old forum. Theres a drop down to select English.  a quick look and I cant find ff's.  Will keep looking. Thanks rgds


I believe it is a two step process.  You have to first find the bearing, get the dimensional details (write them down) then go to the "Bearing Frequency Calculator" along the left edge.  Image below shows what you need for inputs.  It's a 10 year old thread at https://www.maintenance.org/topic/defect-frequencies-for-fag-bearings, but someone summed it up by stating
Quote:
I know this is a lot of work to get what you need, we are working on putting in a much better system on the F'IS webpage, http://www.fisna.com

Mike Bensema
FAG Industrial Services



Not much progress in 10 years!


fag.jpg  





Vibe-Rater

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Reply with quote  #9 
Hi John,Yes looks like 2 steps.  Used to be 1. Type in bearing num and ff's would appear.  I wonder which genius removed that tool if indeed it has been removed. rgds

I'll have a lok at the SKF calculator. In the past though it has only contained SKF bearings - as if there are no other brands in the world.
Sinski

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Reply with quote  #10 
Will post on this one as it spoke about the Schaeffler website looking for bearing frequencies. Looks like they have changed it again. The only way you can find bearing frequencies from their list of bearings is to perform a load case calculation and the fault frequencies appear with the results. They seem to have completely removed any search for them as their own calculation or as part of the datasheet like they used to. Or you use the manual calculator on the left of their page like mentioned above. Anyone else have any luck with easily finding fault frequencies on the Schaeffler Medias website as thats all I could find?


John from PA

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Reply with quote  #11 
If you know the bearing number do the following:

Go to https://medias.schaeffler.com/medias/en!hp/

Select "Products" tab

Input series; example bearing 6309 and hit the search icon (eyeglass)

Select a specific bearing; example 6309-J20AA. Along top of page select Calculation tab.

In Load Cases data fields, insert RPM; example 1500 RPM. Select "Basic frequencies" along top of page.

Capture.jpg 



Sinski

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Reply with quote  #12 
Thanks John.

Strangely enough. This morning when went and searched for the bearing I was looking for that basic frequencies at the top of the page was not there. Still strange though as this still prints out the whole load case including the frequencies wanted just with errors. It used to be just selecting the icon at the top of the page and that would just show the fault frequencies. Its like it is an afterthought now. 


fburgos

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Reply with quote  #13 
thanks john, but where is the FTF
John from PA

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Reply with quote  #14 
Quote:
Originally Posted by fburgos
thanks john, but where is the FTF


Should be BPFO divided by the number of rolling elements, which admittedly may create another search for info.  But don’t go too far for that info, Nb = BPFFO + BPFFI.  In this case 3.0379 + 4.9621 = 8.

Untitled.jpg

fburgos

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Reply with quote  #15 
Thanks, I didn't know that FTF=bpfo/Nb I did know bpfo+bpfi=NB... Then

FTF=bpfo/(bpfi+bpfo)

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