Young Chang lyre supports buzzing

[Porritt, David]

Don:

 

When you move the lyre brace mounting closer to the lyre you're adding
force forward, but actually even more force downward.  If these lyre
assemblies are not constructed of pretty hard wood and good glue do you
think this extra downward force would accelerate wear?

 

dp

 

David M. Porritt, RPT

dporritt at smu.edu

 

From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On
Behalf Of Don Mannino
Sent: Friday, July 11, 2008 10:47 AM
To: Pianotech List
Subject: Re: Young Chang lyre supports buzzing

 

Bruce,

 

It works well to re-locate the top of the lyre support.  The rods should
really be pushing the lyre forward a little anyway, so by re-locating
the tops of the supports slightly closer to the lyre, you "load" the
system for best stability and strength.  It also stops the rods from
buzzing.

 

It's also easy to do, as the wood on the bottom of the keybed is pretty
soft.  Just remove the screws, drop the support rod down and plug the
holes.  Then raise the rod back into position, and push the top of the
support rod towards the lyre, and drive the screws back in at the new
location.

 

While you're there, check that the pedal lyre isn't coming apart where
the posts meet the box.  This could be the reason for the support rods
loosening.  Fixing the lyre might also tighten the rods back up in the
original location.

 

Don Mannino

 

	----- Original Message ----- 

	From: Bruce Dornfeld <mailto:bdornfeld at earthlink.net>  

	To: pianotech <mailto:pianotech at ptg.org>  

	Sent: Thursday, July 10, 2008 9:29 PM

	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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