[CAUT] Puzzler: Yamaha G7 clicks

[reggaepass at aol.com]

And a good thought it is.  I forgot to mention in my blow-by-blow that we checked for knuckle looseness as well.  Thanks for catching that.



Alan


-----Original Message-----
From: Jeannie Grassi <jcgrassi at earthlink.net>
To: 'College and University Technicians' <caut at ptg.org>
Sent: Sat, 26 Jul 2008 10:42 am
Subject: Re: [CAUT] Puzzler: Yamaha G7 clicks






























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 in20case 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.  Ho
wever, 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
the TMZ Toolbar Now! 













 




-------------- next part --------------
An HTML attachment was scrubbed...
URL: https://www.moypiano.com/ptg/caut.php/attachments/20080726/db52c817/attachment.html