These graphs were sent to me by a customer
who did a wow and flutter test on 3 different
EMT rollers.   The first one (top) is from a
factory roller.
 

    This graph (Below) is from  an EMT roller that
I rebuilt.  His comment was "looks Good"

 

    The next one (below)  has high wow and flutter
                               No Good

 

   =

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   Test # 2

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