spring think bling bling

[Joe And Penny Goss]

Hi Ric,
To return the piano to new will mean recaping all bridges and restringing
the plane wire.
Not fatal but surely costly.
Joe Goss RPT
Mother Goose Tools
imatunr@srvinet.com
www.mothergoosetools.com
----- Original Message ----- 
From: "Ric Brekne" <ricbrek@broadpark.no>
To: <pianotech@ptg.org>
Sent: Sunday, September 18, 2005 1:19 PM
Subject: spring think bling bling


> Hi Joe
>
> You are correct. No clear termination. You can actually see how bad the
> damage is if you are looking for it in the pictures. The angle downwards
> of the groove at the pins is quite severe and deep enough question
> whether positive bearing at that point is at all possible. The worst
> ones look to be about a half a mm deep.
>
> Point is... this is a 3 year old  $200,000 piano. If any real repair
> work is to be done I would think a recap would be the clear choice.
> Sure you can epoxy and plane down to the origional height, but the
> stress lines around the bridge pins remain and sooner or later will turn
> into cracks me thinks.  Epoxing a whole set of bridge pins on so young a
> D ???  I mean.. what a shame eh ??
>
> David and Micheal.
>
> Both are correct each in their own way.  The strings do not sit at the
> bottom of their <<ruts>> at the pins. The angle of the groove is too
> deep for that... so in that sense shaving down to match will indeed
> reduce downbearing.  On the otherhand... the ruts cross the entire
> surface of the bridge already... so downbearing has already been
> decreased to some degree.  In the middle of the bridge surface the
> depression is perhaps 0.25 mm... perhaps a bit less.
>
> Seems to me like the process has basically hastened what natural wear on
> the bridge surface by 15-20 years... in addition to causing deep and
> steep angled grooving at the pins.
>
> So how do you guys rate the damage----  light.. severe.... fatal....
> inconsequential ???   Myself, I rate the damage as quite serious.
>
> Thanks for the replies.
> RicB
>
> Hi Ric,
> I am guessing that the string does not have a clear termination point
> due to its riding in the valley of the rut or groove. As it sings the
> termination is sometimes on the side of the pin and again on the valley
> of the groove. Never together as it should be. How is the bearing?
> Enough to de-pin and shave the ruts out? Then re-pin?
>
> Joe Goss RPT Mother Goose Tools
> _______________________________________________
> pianotech list info: https://www.moypiano.com/resources/#archives