While researching spindle issues for my surface grinder I came upon your video. It gave me great insights. It was also interesting that you were able to specifically identify the bearing outer race as the culprit. 👍🏼👍🏼👍🏼
Hi mate, i just did a test run yesterday on HVAC 6.6KV 530 kw 1000 rpm with copper rotor 99.8% double bearing DE NU228 + 6228 and NDE NU228 for bark crusher machine. The test run was done on no load All parameters are great except the gE of the 6228 skf bearing was high, with average 2.4, it started at 10 and after regreasing it went down to 1.088 and went up to 2.4 average after a few readings taken. The motor is new. According to control and monitoring team this is not acceptable and pose medium risk. Please advise is it normal ?
Need to do under load ideally the roller bearings could skid slightly due to reduced load which would give you the high readings. Greasing will dampen out some of high freqs for a while. Common issue on double brgs with roller brg that has low radial loads. Check on load, would be concerned if clear bearing freqs present in standard vibration readings. As opposed to just envelope readings.
@@MotionAmplificationRMSLtd Vibration is very low, averaging 0.2, this afternoon we did dismantle the NU 228 and 6228 SKF explorer C3 from the motor as requested by the monitoring team and replaced them with Fag, reading was still high at 1.4 and 1.9 though the have gone down from 2.1 and 2.4. Thanks for the input, but still not under 1 which proves that your input is on point. Thanks a lot !!!
One question mate, i suspect that the motor we bought has no corona protector being applied on despite being high voltage, what will be the worst scenario ?
One question mate, i suspect that the motor we bought has no corona protector being applied on despite being high voltage, what will be the worst scenario ?
I like the way you you have set your frequency of interests in your CSI analyser display. how did you dismantle the bearing without cutting them? Regards, Omar
Anywhere between 50-80 orders is good practice to get a number of harmonics in the spectrum, 72 is most likely closest band within analyser / software.
@@reliabilitymaintenancesolu6459 72 order is default setting of CSI. After having experience I concluded 30 to 40 orders are enough specially for fan and pump.
I think that's too low, if you had inner race primary bearing defect freq between 12-14 orders you would only get two harmonics of the defect frequencies. You could also miss rotorbar stator slot freqs on the motors usually around 45-60x rpm. Also electrical erosion bearing faults on VSD motors usually show higher harmonics of bearing frequencies due to fluting patterns, you could miss some info with just 30-40 orders. Okay for sleeve bearings but not anitfiction.
I love the software parameters. I'm currently using a SKF microlog analyzer with the @ptitude software. Is yours CSI? What is the detailed software program you're using? Thanks
Great Video Just one concern how did you get cage frequency?It looks you have several frequencies for different parts that is amazing. but I don't know how is it passible to get parts frequency !
For most rolling element bearings the cage frequency is usually between 0.38 -0.42 orders of running speed. Ie for 1 revolution of the shaft the cage will rotate 0.4 orders or 40% of a rev when compared to the running speed.
the inner cage isn't supposed to run at the same speed of the rotor since it is mounted on the shaft?second 40% is it based on literatures or the manufacturer. for me how can I get these things ?Appreciate your response Mustafa
Each rolling element bearing has set defect frequencies based on ball dia, pitch dia and number of balls or rollers. Vibration analysis software usually comes with a database of bearing defect frequencies for each manu
When a lot of money is hanging in the balance for every shutdown or repair, you don’t use basic intuition. This, the proper analysis, makes sure there are no wasted efforts or costs. You know with a certainty the source of the problem. This is a simple example. In a more complicated system that good ole intuition evaporates pretty quickly.
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A very nice presentation. Well done RMS.
What a great video !
thank you
we need more of this real life case studies
How can someone dislike this ? It was so useful thank you so much. Love from India 😃
Brilliant video, thanks very much for sharing, it's nice to see the theory in practical use.
Great video! You have a great way of explaining real world analysis… more videos please on real case analysis videos like this please.
You nailed it dude,nice job man.big like from Iran.
Perfect and Clear demonstration
While researching spindle issues for my surface grinder I came upon your video. It gave me great insights. It was also interesting that you were able to specifically identify the bearing outer race as the culprit. 👍🏼👍🏼👍🏼
Excellent video and thanks for showing the failed part at the end
What a great vedio... Real life problem.. Thank you sir.. Keep it up
Wonderful material! I wish more material like this to be posted. Thank you a lot.
Thanks for a very good explanatiion
Very informative tutorial delivered in a very professional manner.
Great video !
Great video mate
great work, good analyzing software
Hi is a great video, I would like to see another with the same study but at low speed
Yes good idea : )
Excellent Video, Excellent Job RMS Team...
Excellent video
Excellent of chile , thank you
Great video! Well done!
Good video
Good catch.. textbook BPFO.. perfect real life example.
Do you have example for RBPF (rotor bar pass freq)? thanks
How is it possible that the analyzer records Status: OK while there are some red alarm levels bellow?
Hi mate, i just did a test run yesterday on HVAC 6.6KV 530 kw 1000 rpm with copper rotor 99.8% double bearing DE NU228 + 6228 and NDE NU228 for bark crusher machine. The test run was done on no load
All parameters are great except the gE of the 6228 skf bearing was high, with average 2.4, it started at 10 and after regreasing it went down to 1.088 and went up to 2.4 average after a few readings taken. The motor is new.
According to control and monitoring team this is not acceptable and pose medium risk. Please advise is it normal ?
Need to do under load ideally the roller bearings could skid slightly due to reduced load which would give you the high readings. Greasing will dampen out some of high freqs for a while. Common issue on double brgs with roller brg that has low radial loads. Check on load, would be concerned if clear bearing freqs present in standard vibration readings. As opposed to just envelope readings.
@@MotionAmplificationRMSLtd Vibration is very low, averaging 0.2, this afternoon we did dismantle the NU 228 and 6228 SKF explorer C3 from the motor as requested by the monitoring team and replaced them with Fag, reading was still high at 1.4 and 1.9 though the have gone down from 2.1 and 2.4. Thanks for the input, but still not under 1 which proves that your input is on point. Thanks a lot !!!
One question mate, i suspect that the motor we bought has no corona protector being applied on despite being high voltage, what will be the worst scenario ?
One question mate, i suspect that the motor we bought has no corona protector being applied on despite being high voltage, what will be the worst scenario ?
No sure on that question
How to acquire the RPM in on-site inspection?
Can use monitor mode in analyser looking for 1x or laser speedvue on shaft :)
I like the way you you have set your frequency of interests in your CSI analyser display.
how did you dismantle the bearing without cutting them?
Regards,
Omar
It was a self aligning bearing, so after removing a couple of balls either side of the cage the outer race came off intact.
What is the point to take 72 orders on Fan bearing? Probably because of CSI default database setting?
Anywhere between 50-80 orders is good practice to get a number of harmonics in the spectrum, 72 is most likely closest band within analyser / software.
@@reliabilitymaintenancesolu6459 72 order is default setting of CSI. After having experience I concluded 30 to 40 orders are enough specially for fan and pump.
@@reliabilitymaintenancesolu6459 Anyhow great video and thank u so much for your effort.
I think that's too low, if you had inner race primary bearing defect freq between 12-14 orders you would only get two harmonics of the defect frequencies. You could also miss rotorbar stator slot freqs on the motors usually around 45-60x rpm. Also electrical erosion bearing faults on VSD motors usually show higher harmonics of bearing frequencies due to fluting patterns, you could miss some info with just 30-40 orders. Okay for sleeve bearings but not anitfiction.
Hi, I think best practice is to make 2 points. 1 for low orders and 1 for high orders like in this video. @@reliabilitymaintenancesolu6459
I love the software parameters. I'm currently using a SKF microlog analyzer with the @ptitude software. Is yours CSI? What is the detailed software program you're using? Thanks
Hi Brad sorry for late reply just seen it, Yes its Emerson CSI with Machinery Health Manager
Great Video Just one concern how did you get cage frequency?It looks you have several frequencies for different parts that is amazing. but I don't know how is it passible to get parts frequency !
For most rolling element bearings the cage frequency is usually between 0.38 -0.42 orders of running speed. Ie for 1 revolution of the shaft the cage will rotate 0.4 orders or 40% of a rev when compared to the running speed.
the inner cage isn't supposed to run at the same speed of the rotor since it is mounted on the shaft?second 40% is it based on literatures or the manufacturer. for me how can I get these things ?Appreciate your response Mustafa
Each rolling element bearing has set defect frequencies based on ball dia, pitch dia and number of balls or rollers. Vibration analysis software usually comes with a database of bearing defect frequencies for each manu
🙏👍
Well there's your problem. Fan shaft bearings wailing like a banshee and pissing grease. Don't need high tech accelerometer to figure this one out.
When a lot of money is hanging in the balance for every shutdown or repair, you don’t use basic intuition. This, the proper analysis, makes sure there are no wasted efforts or costs. You know with a certainty the source of the problem. This is a simple example. In a more complicated system that good ole intuition evaporates pretty quickly.