Hi

Dear All

Board Machine
Press Section
Pick up Press roll
RPM 100
Bearing # 23080
BPFI= 16.26

What should be my Fmax? and LOR? and Vibration Transducer?
Currently I am using Fmax= 30kCPM and LOR=400 and Accelerometer of 500mv/g

Please quick help is needed ?????

Thank You in advance....

Best Regards
Zaheer Abbbas Khan
The Engineer

And

Can we measure DISPLACEMENT THERE NOT VELOCITY??

And what no of averages should be used currently i am using 3.


zaheer

looks like we might be using 100 orders for Fmax. 1600 LOR
100 mv/g
That slow, you may want to take some pk-vue data.
Typicaly the recommend using orders to analyze rolling element bearings, but there are always differing opinions. That what I have for suggestions at this time.

What's the temperature? I use g's with an accelerometer as you loose too much integrating. Integration is only relative; not absolute.

Where does 3 averages come in to play?

Do you data look _______________________? OK! Clean?

Dear,s

Racer98
100 orders means Fmax=10 kCPM
BPFI= 16.26*RPM= 1626 CPM
By keeping Fmax=100 orders=10kCPM I ll be able to capture 6 harmonics of BPFI. I ll not be able to capture 7X BPFI and so on. M I right???
If m right How much number of bearing fault frequency harmonics my spectrum should be able to capture.

2nd I am also taking two envelop readings on bearing one with 3k to 60kCPM filter and secons with 30k to 600kCPM filter???
In enveloping I am only taking spectrum.Should I take TWF also in enveloping????

My question is that M I going right????

And DEAR SAM

Temperature there is 35 to 50 degrees...

I dont under your averages question!!!!

Zaheer
Engineer

quote:

Racer98
100 orders means Fmax=10 kCPM
BPFI= 16.26*RPM= 1626 CPM
By keeping Fmax=100 orders=10kCPM I ll be able to capture 6 harmonics of BPFI. I ll not be able to capture 7X BPFI and so on. M I right???

That part is right by my calculator. I can't answer the rest... will let Racer or others do that.

Dear pete...

Suggestion from you is required regarding my case!!!!

Thanking you in advance....

Zaheer

T.E.

When ever I am unsure how to measure any one point, I will adjust my parameters until the defect (the reason I'm looking) shows up. At 100rpms I start with displacement and it is just as important where you measure it. I have seen movmement with my eyes that my 2130 has a hard time recording.

In the case above I used a stationary point and video'd the shaft moving back and forth. Measured the vibration with a folding ruler.

CBMN

At such a slow speed it may prove beneficial to listen to the bearings with an acoustical instrument.

Hi Zaheer,

Fmax 120 orders 1600 LOR, 4 averages is what I would use. This low speed is still within the capability of a good quality 100 mV/g accelerometer. You would also take an enveloped spectrum in acceleration. Sounds like you are using SKF - I can't remember what filters 1,2,3,4 represent in terms of HP and LP cut offs. I remember from my SKF days no one seemed to know what filter either so most would collect a spectrum for each filter setting every time - overkill in my view. Trial and error is required there. rgds

Hi Zaheer,

If you are using a SKF kit for your enveloping from memory I think the filters you want to use are;

No1 5-10Hz for felts on paper mills
No2 20-1KHz for flats on rolls on paper mills

Regards

Just to throw in another 2 bob from the Australian camp
I'd go 250 Hz (should see about 9X bpfi)you could even trim that down to 200 Hz (7 X bpfi)
1600 lines (approx 6.5 sec/8 sec collection time)
1 average
acceleration or peakvue if you've got it.
standard 100mV/g accelerometer.
I'm getting some very nice data with a 100mV accel on a 2.4 rpm shaft

Dear All,

Thanks for your response. The guidance from you guys is appreciable and helpful for me...


Thanks
Zaheer
The Engineer