[CAUT] Restringing treble

[Don]

Hi,

It is the plate/hitch pins far more than just the soundboard. Plates are
much more flexible than we think. Just look at your tuning lever when doing
tight pins--the forces are much smaller there than on the plate.

At 06:50 AM 31/12/2004 EST, you wrote:
>Greetings, 
>  I wrote: 
>
>I would think that it is the board rather than the plate.  When a string
>breaks in the treble, the adjacent strings of that note seem to always
>go sharp,  and when the string is replace, they come right back down.  Would 
>one
>string missing allow the plate to relax?, and if so, only on the immediate
>area?
>
>David replies: 
><< I don't know.  One string breaking takes over 300 lbs off the plate
>whereas it takes only a small percentage as a function of a change in
>the deflection angle off the soundboard.  
>David Love
>   >>
>And Ron writes: 
>>>Would one string missing allow the soundboard to rise, and if so, only in 
>the immediate area? Got any idea how length change in a string affects 
>pitch, and how much soundboard rise it takes at the existing bearing angles 
>to produce the length change necessary to affect the pitch difference 
>observed?<<
>
>What I wonder is why such a localized effect of losing a string?  Cast iron 
>is pretty stiff, and if losing a string allows the plate to relax,
wouldn't it 
>affect more than just the two notes on either side?  I have measured 
>soundboard drop under tension, and it isn't uncommon to see them drop
.050" when the 
>piano is chipped to pitch.  Some more (such as the Chickerings with the
inner 
>rim), some less (Steinways and Baldwins), but there is still a lot of
movement 
>up and down. 
>Regards, 
>
>
>    
>
>
>
>
>Ed Foote RPT 
>http://www.uk-piano.org/edfoote/index.html
>www.uk-piano.org/edfoote/well_tempered_piano.html
> 
>_______________________________________________
>caut list info: https://www.moypiano.com/resources/#archives
>
>

Regards,
Don Rose, B.Mus., A.M.U.S., A.MUS., R.P.T.
Non calor sed umor est qui nobis incommodat

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