Restoring crown in old soundboards - new cracks

[Farrell]

Weldwood, yes. Titebond, yes. Hide glue, yes. Any good wood glue. I personally have used hide glue and Titebond.

Terry Farrell
  
----- Original Message ----- 
From: "Isaac OLEG" <oleg-i@wanadoo.fr>
To: "Pianotech" <pianotech@ptg.org>
Sent: Wednesday, April 16, 2003 4:45 AM
Subject: RE: Restoring crown in old soundboards - new cracks


Hello,

I by chance did not see yet (more recent) shims of mine cracking, but
since I uses a router to open the crack, the joint is cleaner and not
made of crushed wood.

I still wander what glue of choice to use on these shims, Plastic
resin from Weldwood (UreaFormalheyde monocomposite), Titebond ((I
doubt). We have in Europe Caurite which is too a UreaFormol , but the
joint may be the thinner possible (no strength of the glue by itself).

What are you using generally (if you don't mind ?)

And yes almost all the shims that have been made 10 to 15 years ago
are opening again on almost all the instruments I see.

best Regards

Isaac OLEG

Entretien et réparation de pianos.

PianoTech
17 rue de Choisy
94400 VITRY sur SEINE
FRANCE
tel : 033 01 47 18 06 98
fax : 033 01 47 18 06 90
cell: 06 60 42 58 77

> -----Message d'origine-----
> De : pianotech-bounces@ptg.org
> [mailto:pianotech-bounces@ptg.org]De la
> part de Greg Newell
> Envoyé : mercredi 16 avril 2003 04:39
> À : Pianotech
> Objet : Re: Restoring crown in old soundboards
>
>
>
> Keep watching! You'll almost be able to see them crack
> before your very eyes.
>
> Greg
>
>
>
> At 07:50 PM 4/15/2003, you wrote:
>
> >While the list is discussing soundboard crown at the
> moment, I thought I
> >might mention that a piano dealer sent a 100 year old
> Steinway grand with a
> >badly cracked soundboard back to the factory in Hamburg
> for restoration.
> >Well, £8000 ($12k) and 3 months later it came back
> sounding perfect. To my
> >surprise, I was told that, the factory did not install a
> new soundboard but
> >instead repaired the original by shimming, i.e. filing in
> the cracks with
> >those V shaped wedge fillets.
> >  When I was at piano college we were told that this is a
> method used to
> >restore crown "in situ" as it were. The theory, I suppose,
> is that if you
> >wedge more material into the panels, it will force the
> panels to bow or bend
> >back into shape. I have not yet had the opportunity to put
> this to the test,
> >but have any of you tried this method or think it feasible.
> >
> >Regards
> >Alan Forsyth
> >Edinburgh
> >    "Madam, all pianos sound horrible, but if you play
> music on them they
> >sound very nice!"  (from my forthcoming book, "A Day In
> The Life Of a Piano
> >Tuner" by yours truly)
> >
> >_______________________________________________
> >pianotech list info: https://www.moypiano.com/resources/#archives
>
> Greg Newell
> mailto:gnewell@ameritech.net
>

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