The CSI Software has given the exact same frequency values for 2 bearings:
(I have these two bearings on 1 machine..)

NTN NUP2213: (in Orders)
.436 ftf
3.83 bsf
8.28 BPFO
10.72 BPFI

Same numbers for NTN NU 238

The probability of this seems to me to be vanishingly small.. Can anyone confirm these numbers?

Martin,

I don't find the NUP 2213 in my DB. However, I have an NTN NU2213 and an NU2213E.
Numbers for them are: NU2213: 0.4298, 3.4913, 6.8769, 9.1231
For the NU2213E: 0.4198, 3.0365, 6.7166, 9.2834

The "P in the number just means it has a shield one side (they call it a loose plate). Use the numbers for the NU 2213 instead of the 2213E.
The numbers you had for the NU238 are the same ones I have.

Dave

This message has been edited. Last edited by: RRS_Dave,

Martin,

RBMWare Version 4.81 gives those numbers for the nu238 but the nup2213 is listed as follows:

.430 ftf
3.496 bsf
6.878 bpfo
9.122 bpfi

Nothing on the ntn website to confirm or deny this info.

Good Luck,

Danny

Are these the number listings you see in your Software?

Looks like the "e" at the end has something to do with the frequencies number, huh?

Ralph,

About 25 years ago when I first started seeing the E suffix it stood for "Extra Capacity". Some internal redesigns allowed for higher load ratings and thus slightly different defect frequencies. I don't really know if both styles are still made or if the "E" has become the defacto standard.

dj

Before the E used to be that there in some cases was added a ball in the bearing, now that is standard and the E is dropped. So that increased the alternatives on what data to look for in a FFT from a bearing so the brutal way is to look for several bearing data until it matches the FFT, and then the variations due to geometry changes due to wear, mounting etc.... I usually adjust speed a bit to get a match. Once in a while you get a perfect match, just like that, then you better look for what´s wrong, it´s normally not that perfect IRL. Olov

Hi-

When you run into frequency issues, stop by http://www.sourceindex.com. By using the DEMO on the quick click menu you can search over 250,000 base bearing frequencies. Visitors get free searches to try theThe Bearing Expert database.

Impossible numbers mystery solved:
In RBMware, when you look up a bearing, the lookup function automatically fills in the values into the frequency calculator.

It doesn't matter if you put a different bearing number in the calculator, it uses the physical charcteristics from the last bearing looked up.

so lookup the bearing you want to autoload the physical data.

This may be the source of some the complaints I have seen about CSI bearing freq calcs

Dave,

If I'm not mistaken a lot of the bearings in CSI file were entered by customers, not by CSI.

I can't remember where I got it, but I actually have a NTN Canada program that has all their fault frequencies in it.

Heres what it has:
NUP2213
BPFO 6.878
BPFI 9.122
BSF 3.496
FTF (Rotating Outer Race):0.570
FTF (Rotating Inner Race):0.430

NU238
BPFO 8.282
BPFI 10.718
BSF 3.835
FTF (Rotating Outer Race) 0.564
FTF (Rotating Inner Race) 0.436

Rich:

Those concur with my database.

Howard