Piano Rims (rambling post)

[Phillip L Ford]

On Thu, 3 Jan 2002 22:08:25   
 Delwin D Fandrich wrote:
>
>----- Original Message -----
>From: "Phillip L Ford" <fordpiano@lycos.com>
>To: <pianotech@ptg.org>
>Sent: January 03, 2002 9:01 PM
>Subject: Re: Piano Rims (rambling post)
>
>
>>
>> Sorry, but I'm still confused.  Does this mean that you want
>> low impedance in the treble and high impedance in the bass?
>
>No. See below.
>
>
>>
>> So, this means that you want stiffness in the bass and mass
>> in the treble?
>
>Bingo! In theory, at least. In practice you end up designing the rim so that
>it is stiff enough for the bass and massive enough for the treble and run it
>that way all the way around.
>
>Del
>
Thanks, Del.  I think that what was confusing me is that we're talking about
two situations.  One is the situation where you want (controlled) energy
transfer and the other situation is where you are trying to avoid energy
transfer.  In the case of the soundboard, where you want energy transfer
from the string to take place, you don't want stiffness in the bass or mass
in the treble (correct?).  But in the case of the of the termination at the other
end of the string or the case of the attachment of the soundboard to the rim
you don't want energy transfer to take place so you do want stiffness in the
bass and mass in the treble.  Sound right now?

Phil F


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