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Danny Harvey

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Reply with quote  #31 
Ted,

Yes, the Ringfedders are time consuming. They ping on occasion but I don't know what occasion that is. I suspect they have some isolated instances of stick-slip especially during initial start-up.

This is the spectrum that I was wondering about:

FW-1, FIA Full Speed, B4 Brg Replacement.jpg 

The peak at 10 x bpfo or about 82 orders looks like it might have some small and closely spaced sidebands that might indicate the cause of the bpfo excitation.

Walt Strong

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Reply with quote  #32 
Looking at the above photo shows the label on accelerometer cable as "Axial", but the installed orientation is far from being parallel to the shaft. The orientation looks to be closer to vertical than any other orthogonal direction.

Walt 
MachDiag

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Reply with quote  #33 

Danny says,  "Yes, the Ringfedders are time consuming. They ping on occasion... "

  • The ping... You've experienced this first hand, or heard/read of this?

Here's what I can find for sidebands on that spectrum.  Remember, this is before bearing replacement.  The 1x sidebands were auto-found using "next peak right" cursor key (CSI speak), the 0.427x sidebands I found myself.

Danny 2.jpg    Danny 3.jpg 

Walt says, "Looking at the above photo shows the label on accelerometer cable as "Axial", but the
               installed orientation is far from being parallel to the shaft. The orientation looks to be 
               closer to vertical than any other orthogonal direction."

  • The axial accelerometer is not installed in that photo, what is seen is just the connector.  I think the customer had removed it, defective maybe (?).  You can seen the spot face on the block of where it'd go.      

Walt Strong

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Reply with quote  #34 
Thanks for the Reality Update!

Walt
Danny Harvey

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Reply with quote  #35 
Ted,

So that is no longer present and the date stamp is accurate?  I see. Sorry for not spotting that but thanks for indulging my curiosity.  Is the .427 x cage frequency? Did the bearing have outer race wear and cage damage?

WRT the Ringfedders pinging I couldn't say exactly when they ping. I have only experienced it a few times and it has been short duration. I've never been able to record it. My belief is that it is minute axial adjustments in the expansion elements or what ever you want to call it. It seems like there would be a corresponding minute change in bolt torque but I don't know if it would be big enough to measure with a torque wrench.

One of my clients has hundreds of really big Ringfedders on his conveyor pulleys.  They are all 10" and over shafts running 100-200 rpm so it's different but might be the same.  I'll give him a call and ask what his experience is.


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