[pianotech] Tuning stability problem

[Gerald Groot]

We've got 2 Steinway D's, a Bose 9', Many Steinway B's and others brands, all setting on trucks at my college. I have no problem with stability during tuning with any of them related to the piano dollies.  2 years ago, we had one really old, original truck on a D start to bend, as if it was about ready to give way.  The outter inside edges of one wheel were nearly touching the ground yet, no instability.  We replaced the truck but still, nothing changed.  

On the other hand, I have had issues with tuning changes during lighting tests (lights can be hot!) however and/or when they turn the air on which sometimes blows right onto the piano.  I would be more inclined to suspect something like this as an issue or moving it around on an unlevel floor maybe.  

Jer

-----Original Message-----
From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf Of limhseng at gmail.com
Sent: Tuesday, September 21, 2010 10:30 PM
To: pmc033 at earthlink.net; pianotech at ptg.org
Subject: Re: [pianotech] Tuning stability problem

Thanks Paul
Its a Kawai SK7. The tuning pins are good and the piano is well kept  in an a/c environment. It is use in a concert hall setting.

Lim
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-----Original Message-----
From: "Paul McCloud" <pmc033 at earthlink.net>
Sender: pianotech-bounces at ptg.org
Date: Tue, 21 Sep 2010 04:19:06 
To: limhseng at gmail.com,<pianotech at ptg.org>
Reply-To: pmc033 at earthlink.net, pianotech at ptg.org
Subject: Re: [pianotech] Tuning stability problem

Hi, Lim:
	I've not seen any stability problems with pianos on stage trucks (trolly).
You might try tightening the bolts, but I don't see how a stage truck would
alter the tuning.  You might look at other factors like temperature changes
or air movement over the piano as you tune.  Is there direct sun on the
piano?  Stage lights?  Did you move the piano just before tuning?  I've not
tuned one of these, so I couldn't comment on how they tune.  Some Kawai
pianos are challenging to tune, hard to dial in unisons, etc.  Maybe Don
Mannino can jump in here.  (SK-7 is Shugeru Kawai, no?)
	Paul McCloud
	San Diego


> [Original Message]
> From: <limhseng at gmail.com>
> To: <pianotech at ptg.org>
> Date: 09/21/2010 4:00:01 AM
> Subject: [pianotech] Tuning stability problem
>
> Hi 
> When a grand piano sits on a Y type trolly, will there be tuning
stability problems? I tuned a SK7 which sits on a Y trolly and I have a
hard time on the octaves and unisons from key 55 onwards.
>
> Regards
> Lim
> Sent from my BlackBerry Wireless Handheld 
> Powered by Gee! from StarHub