Round Damper Blocks

[Delwin D Fandrich]

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  ----- Original Message -----=20
  From: Michael Gamble=20
  To: Pianotech=20
  Sent: October 14, 2003 12:11 PM
  Subject: Re: Round Damper Blocks


  Hello Jarred
  The problem of "ringing on" in the bass section has been a problem in =
many upright under-damped pianos. I don't think it was the lack of Mass =
in the damper which allowed the condition, rather it was the lack of =
damping the important nodal points.=20

Actually, it more than likely is a mass problem. The idea of the =
vertical damper not working because they do not sit directly on some =
node is generally overworked, often being used to excuse what is simply =
a poorly designed damper system. You can easily test this by setting up =
a monochord and testing the damper function at different locations. They =
actually work pretty well over quite a broad distance if the mass/spring =
ratio is appropriate for the frequencies they are expected to damp out. =
Higher mass is appropriate for the bass section. Less mass is =
appropriate for the treble section. Increased spring pressure doesn't =
really improve bass damping. The brass damper barrel is very often a =
good solution to poor bass damping.

Del
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