[pianotech] rattling grand damper

[Paul McCloud]

Has glue has soaked the bushing, making it hard?

Paul McCloud

 

From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf
Of PAULREVENKOJONES at aol.com
Sent: Monday, March 02, 2009 1:16 PM
To: pianotech at ptg.org
Subject: Re: [pianotech] rattling grand damper

 

Is the wire seated (lightly) against the guide rail bushing?

 

Paul

 

In a message dated 3/2/2009 1:50:09 A.M. Central Standard Time,
da88ve at gmail.com writes:

    The highest bass damper on this small grand is one where the damper is
way offset from the others to clear a plate strut.  So the damper wire runs
straight back parallel to the head, then takes its right-angle bend down
through the guide rail.  Trouble is, it rattles, or "twangs" when it settles
onto the vibrating bichord, almost like a nano version of twanging a ruler
on the edge of the desk in grade school, to get that
"doing-oing-oing-oing-oing" effect.  

    No, the head is not loose on the wire.  No, the hole in the guide rail
isn't too big.  The piano's only a few years old.  No, the screw in the
damper block isn't loose.  No, the damper wire isn't contacting the head --
it runs along the felt, but not right against. it.  Yes, the damper lifts
and seats straight up and down without twisting.  

    I just don't know what to do to get rid of that "duhd-d-d-d-d-d" noise
(to use a technical term).  Maybe they didn't use a stiff enough gauge of
damper wire?

    --David Nereson, RPT   

 

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