How to explain a pitch adjustment..and!

[pianolover 88]

<< 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/

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

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