[CAUT] Puzzler: Yamaha G7 clicks

[Jeannie Grassi]

Alan,

Could it have been a loose knuckle glue joint rather than the leather
itself.  I've encountered that as a source of noise in the past.  So that
when you replaced and reglued it, of course the sound went away.  Just a
thought.

jeannie

 

  _____  

From: caut-bounces at ptg.org [mailto:caut-bounces at ptg.org] On Behalf Of
reggaepass at aol.com
Sent: Saturday, July 26, 2008 10:15 AM
To: caut at ptg.org
Subject: Re: [CAUT] Puzzler: Yamaha G7 clicks

 

First, let me say that I have never worked on a Yamaha of this vintage
before.  The craftsmanship is excellent.  It has Schwander wippens.  First
we thought it was hardening of the jack felt punching.  When needling and
then replacing that did not solve the problem, we redirected our attention
to the repetition lever, brushing, needling, and then replacing the drop
screw leather pad ("bumper").  Still no change.  We even tried replacing the
piece of action cloth under the repetition lever height adjusting screw
(Schwander, right?), just in case that had somehow gotten hard enough over
the years to make noise when the lever came back up.  Nope, not that either.

 

None of the keys were chucking (on a sixty-five year old instrument that has
probably never had any major servicing!).  I have seen that condition either
cause or contribute to this kind of noise before.  But if any thing, the
balance holes are tight on the key pins.

 

Your last thought wins you bragging rights, Dan.  We decided to brush some
knuckles.  An associateA 0observed that the nap of the leather did not lift
as it has on all of the other pianos on which we have brushed knuckles.  So
we endeavored to replace the knuckle.  The original had a core about 1.6 mm
thick, whereas all of the replacements we had on hand-Renner, Abel and
Tokiwa-have cores that are around 2 mm thick.  Also, the original slot was
too shallow for any of the replacements.  So we used a 2 mm wide file to
both widen and deepen the slot.  New knuckle installed (used Titebond Trim
and Molding glue, which seems to work well), noise gone. Well, as we so
often say in the piano world, "One down, eighty-seven to go!"  

 

We seem to identified the fix, though I must admit that I'm not sure how it
is that a hard knuckle could cause this problem.  (Then again, we humans
have appreciated sunrises long before we understood what we were actually
witnessing when we saw one.)  If anyone knows 1) WHY the hard knuckle
leather causes this click on a quick release, or 2) HOW to treat the
existing knuckle leather (magic potion, special armadillo comb, etc.),
PLEASE do share your insights (hopefully before we file 87 more knuckle
slots!).

 

May this save someone else all of the time we spent trouble-shooting.

 

Cheers,

 

Alan Eder

 

 



-----Original Message-----
From: Dan Reed <pianoarts at tx.rr.com>
To: College and University Technicians <caut at ptg.org>
Sent: Fri, 25 Jul 2008 8:57 pm
Subject: Re: [CAUT] Puzzler: Yamaha G7 clicks

In addition to hard jack stop felt....Some more of the usual
suspects....
 
 
 
Hard drop screw felt on the rep lever, snapping back on a quick
release, hitting the drop screw.....
 
 
'Chucking key...key bouncing on the balance rail on a quick release...
 
 
Hard knuckle...bouncing on the jack top...
 
 
Dan
 
 
Dallas
 
 
 
On Jul 25, 2008, at 7:36 PM, reggaepass at aol.com wrote:
 
 
<excerpt>Yes, you read that correctly, this is a Yamaha model G (not
C) 7, s/n 3xxxxx.  When the key is released slowly, the click isn't
noticeable.  However, on a quick release, it is annoyingly prominent.
 What is the cause?
 
 
Alan Eder
 
 
 
<fontfami
ly><param>Arial</param><x-tad-bigger>The Famous, the
Infamous, the Lame - in your browser.
</x-tad-bigger><color><param>0000,0000,EEEE</param><x-tad-bigger>Get
the TMZ Toolbar
Now</x-tad-bigger></color><x-tad-bigger>!</x-tad-bigger></fontfamily> 
</excerpt>=
  _____  


The Famous, the Infamous, the Lame - in your browser. Get
<http://toolbar.aol.com/tmz/download.html?NCID=aolcmp00050000000014>  the
TMZ Toolbar Now! 

-------------- next part --------------
An HTML attachment was scrubbed...
URL: https://www.moypiano.com/ptg/caut.php/attachments/20080726/615a8334/attachment.html