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Beatnik

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Reply with quote  #16 
Quote:
Originally Posted by John from PA
Much better picture!

In the image, the lower rotor and specifically the first full tooth that I see; there seems to be some very localized distress at the end of the tooth.  Again, it appears over a small area.  But then as we move upward on the image, it appears that the distressed area get significantly larger to the point at where the two gears mesh it might be as much as 1/4 of the face width.  Is that the case?  Is it really surface distress?


You are right it's distress. In case anyone wonder how this type of dommage appear in vibration, I attached the Spectrum and TWF.

How severe are those damages in your experience? I try to know if it was the adequate moment to change the gearbox. too soon? too late? 

Big Al : You are right about everything. We really need improve our oil management and fix our leaking issues. We do have breather and oil levels...


 
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John from PA

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Reply with quote  #17 
Quote:
Originally Posted by John from PA
Much better picture!

In the image, the lower rotor and specifically the first full tooth that I see; there seems to be some very localized distress at the end of the tooth.  Again, it appears over a small area.  But then as we move upward on the image, it appears that the distressed area gets significantly larger to the point at where the two gears mesh it might be as much as 1/4 of the face width.  Is that the case?  Is it really surface distress?


Am I correct in that the area of distress varies in width across the tooth from a small area to something near 1/4 the face width (or maybe more)?  If so, and suspecting a shrunk on gear with key, I would be suspicious that the gear was incorrectly mounted to the shaft or you have a bent shaft.  Bores that are out of parallel tend to show even wear all on one end of the tooth, not an uneven pattern over the span of a revolution.
Beatnik

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Posts: 183
Reply with quote  #18 
Quote:
Originally Posted by John from PA


Am I correct in that the area of distress varies in width across the tooth from a small area to something near 1/4 the face width (or maybe more)?  If so, and suspecting a shrunk on gear with key, I would be suspicious that the gear was incorrectly mounted to the shaft or you have a bent shaft.  Bores that are out of parallel tend to show even wear all on one end of the tooth, not an uneven pattern over the span of a revolution.


You are correct. I noted that the damage was uneven too. Thanks for the explanation!
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