"Terry Pinnell" wrote in message
...
Michael Gray wrote:
It is usually the sides of the case behaving like a drum.
Try damping both sides with your hands, and see what happens.
That makes sense, but holding both sides doesn't diminish the beat. I
can now *feel* it as well as hear it (~ 1 Hz). Any other ideas on
stopping it? How about that rpm reduction I mentioned?
--
Terry Pinnell
Hobbyist, West Sussex, UK
You are an exceptional person to be able to hear 1 Hz!
John
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