[CAUT] pre-stretching new string?

[Paul T Williams]

Cy, 
Wouldn't a sponge-like swelling also cause the closer pin to move closer 
to the hitch pin? or stay close to the same since it would move up and out 
from center of bridge core...

Paul




"Cy Shuster" <cy at shusterpiano.com> 
Sent by: caut-bounces at ptg.org
06/08/2007 08:23 AM
Please respond to
Cy Shuster <cy at shusterpiano.com>; Please respond to
College and University Technicians <caut at ptg.org>


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Re: [CAUT] pre-stretching new string?







----- Original Message ----- 
From: "Don" <pianotuna at accesscomm.ca>
To: "College and University Technicians" <caut at ptg.org>
Sent: Thursday, June 07, 2007 12:48 PM
Subject: Re: [CAUT] pre-stretching new string?

> I think that brings the focus of pitch change directly to the bridge and
> bridge pins. That #2 is possibly the main frame, and #3 is the pin 
block.
>
> If I had to guess at distribution numbers for a 20 cent pitch change at 
A4
> I'd distribute the numbers as 9 cents for the bridge/pins, 7 for the 
main
> frame, and 5 for the pin block.
>
> Regards,
> Don Rose, B.Mus., A.M.U.S., A.MUS., R.P.T.

Don,

I'm having trouble visualizing the change of dimension of a 
cross-laminated 
pinblock with humidity.  Do you think the change in the horizontal plane 
is 
the significant factor?  Does it get thicker, too?  If it gets larger in 
every dimension, like a dry sponge, then the pins farther from the plate 
flange should move away from the hitch pin more than the close pins do.

--Cy--


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