Young Chang lyre supports buzzing

[Garret Traylor]

Bruce,

 

It may not look pretty but. Try bridging the two support braces at some
point along the length; the goal to exert pressure inward or outward on the
rods in order to cancel any node coming from the length of the brace and to
place side pressure on the bracket pins?  If you hold or squeeze the two
braces with your hands what force causes the buzz to stop?  Also, try
putting felt balance rail punching under each lyre support screws? Goal of
pre-muting reducing the sound transference.  I don't know the number but
locktite I am sure makes a product specific for "soft" gap filling.  Dipping
the hinges in Plasti Dip might work.
http://www.plastidip.com/home_solutions/Plasti_Dip Lots of colors to choose
from.  Hope you are able to catch the buzz.

Kindest Regards, 

Garret 

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From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf
Of Bruce Dornfeld
Sent: Friday, July 11, 2008 12:29 AM
To: pianotech
Subject: Young Chang lyre supports buzzing

 

I have a number of grand pianos built by Young Chang that I service that
have the same trouble.  The lyre support brackets vibrate or buzz with some
frequencies when the piano is played.  When all of the screws are tightened,
there is too much play in the hinge.  This is most often causing noise at
the top of the lyre support, but sometimes at the bottom too.  Sympathetic
vibrations are always a pain, but I do not know how to fix these. 

 

This week, I removed a pair of them to repair,  First, I tried hitting the
pin with a ball peen hammer with the other end on an anvil, but it only made
it flatter outside of the hinge area.  Previously, I have tried wrapping
some yarn around it, but it did not last.  I have considered squeezing the
bracket around the pin, but is looks like cast metal and I am afraid it
might just break.

 

There are tons of Young Changs out there.  What are you all doing to keep
the lyre support brackets from vibrating along with the music?  I can't be
the only one having trouble with these!  Help me!  Please! 

 

 

Bruce Dornfeld, RPT

bdornfeld at earthlink.net

North Shore Chapter

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