How to explain a pitch adjustment..and!

[Don]

Hi Terry,

Why do you suggest the iron plate takes "more time to distribute and adjust
to thethe added tension"?

The evidence is clear that the plate moves -- and moves less if the strings
are individually tied and also moves less when the plate is "the full
perimeter style" of plate. It is also quite clear to me that this move
happens almost instantly. Either that--or the hitch pins are bending--but
then the full permimeter plate would make no difference--and it does.

At 09:47 AM 12/21/2005 -0800, you wrote:
><< the wire bends at the bridge pins and under the capo will be
>moved toward the tuning pins. These bends will take more time to stretch
>and will make the tuning go out within a few days/weeks/months.>>
>
>you beat me to the punch on that one! Yes, that is a factor, plus the iron 
>plate takes more time to distribute and adjust to the added tension than 
>does the soundboard.
>
>Terry Peterson
>
>
>
>----Original Message Follows----
>From: Marcel Carey <mcpiano@videotron.ca>
>Reply-To: Pianotech <pianotech@ptg.org>
>To: "'Pianotech'" <pianotech@ptg.org>
>Subject: RE : How to explain a pitch adjustment..and!
>Date: Wed, 21 Dec 2005 07:03:24 -0500
>
>I think there is a factor that was not mentioned. For large pitch
>raises, the wire bends at the bridge pins and under the capo will be
>moved toward the tuning pins. These bends will take more time to stretch
>and will make the tuning go out within a few days/weeks/months. The
>soundboard movement will settle faster than these wire bends IMHO.
>
>Marcel Carey, RPT
>Sherbrooke, QC
> >
> >
> > <<Are you suggesting that tuning pin movement is the source
> > of pitch instability after pitch correction?>>
> >
> > Nope. It's the change in TENSION precipitated by the
> > excessive pin movements
> > (during the PR) that cause instability. When large amounts of
> > tension are
> > added,(which can and often is THOUSANDS of pounds!) the piano must
> > distribute this tension; it does not do so immediately, as we know.
> > Similarly, after installing a DC I will always let the piano
> > aclimate for at
> > least two weeks before tuning, as the pitch will almost always drop,
> > sometimes substantially). IF the client is going to play the
> > piano only
> > occasioanlly, I will then schedule the next tuning in 6 months .
> >
> > Terry Peterson
> >
> >
> >
> > ----Original Message Follows----
> > From: Don <pianotuna@yahoo.com>
> > Reply-To: Pianotech <pianotech@ptg.org>
> > To: Pianotech <pianotech@ptg.org>
> > Subject: Re: How to explain a pitch adjustment..and!
> > Date: Tue, 20 Dec 2005 21:53:44
> >
> > Hi Terry,
> >
> > Are you suggesting that tuning pin movement is the source of
> > pitch instability after pitch correction?
> >
> > At 04:24 PM 12/20/2005 -0800, you wrote:
> >  >Depending on the amount of PR, ususally more than 12C, I
> > always schedule a  >"follow-up" tuning in 1-3 months,
> > explaining that after restoring all that  >loststring
> > tension, the piano now must "settle" and adjust to that added
> >  >tension, and it some shifting of will occur. So the
> > follow-up is crucial
> > in
> >  >building long term stabilty. And that tuning will leave the
> > piano much
> > more
> >  >stable because tuning pin movement will be much smaller
> > than during the  >initial PR and tuning. Again, never a
> > problem.  >  >Terry Peterson
> >
> > Regards,
> > Don Rose, B.Mus., A.M.U.S., A.MUS., R.P.T.
> > Non calor sed umor est qui nobis incommodat
> >
>mailto:pianotuna@yahoo.com	http://us.geocities.com/drpt1948/
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Regards,
Don Rose, B.Mus., A.M.U.S., A.MUS., R.P.T.
Non calor sed umor est qui nobis incommodat

mailto:pianotuna@yahoo.com	http://us.geocities.com/drpt1948/

3004 Grant Rd. REGINA, SK, S4S 5G7
306-539-0716 or 1-888-29t-uner