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Ron Stiemsma

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Reply with quote  #16 

Just an update
I got this in an email from the Foreman:

"we had foreign material pass through 3-4 coal mill’s reheat ( outboard ) hammer section.

We repaired some broken mill parts and also checked for loose parts on the rotor. We found the nuts that tighten the hammer hub to the rotor was not as tight as they should be. This could possibly be the shifting mass that you were experiencing. We tightened and tack welded both inboard and outboard.  We  changed both bearing and removed the balance weights"

Guess we will find out when they are ready to balance it again.


fburgos

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Reply with quote  #17 
Once i had a carbon mill drum full of dust, a hole on the side and a regular vacum prove my guessing about the moving mass.
Ron Stiemsma

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Posts: 84
Reply with quote  #18 
Solved:

The hub was not the problem.  It did the same thing.  Used a Motion Amplification Camera and found a loose bearing pedestal foot.  They fixed that and found a liner was not installed correctly and was causing a rub in the fan.  They fixed these two items and the mill was balanced with no issue.
Walt Strong

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Reply with quote  #19 
Ron,

Thanks for the feedback. I have had more than one instance of two or more issues that combine for a making a difficult problem. ANy more comments on the new tool MAC?

Walt
Ron Stiemsma

Sr. Member
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Posts: 84
Reply with quote  #20 
I do not think the foundation was the main issue but the camera did show one foot was moving and the other three were stable.  They were able to get some movement on the bolts when they tightened it down.  The camera works great for any foundation issue.
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