Recrowning the soundboard,something different

[David Love]

I heard a presentation by a guy from Bechstein a few years back who
described a similar procedure used to reintroduce crown.  He described
cutting a kerf in a few places along the bridge, wedging up the board from
underneath and then gluing some hardwood wedges (rather than epoxy) into the
kerfs (kerves?).  The idea is that the bridge then acts somewhat like a
curved rib to introduce and support crown.

David Love


----- Original Message -----
From: "Wayne Hohle" <wayne.hohle@sympatico.ca>
To: <pianotech@ptg.org>
Sent: May 25, 2002 5:10 AM
Subject: Re: Recrowning the soundboard,something different


> hi list
> a recent chapter meeting our host explained that he improved sound board
crown
> by cutting through the  treble-tenor bridge, perhaps in two or three
places, to
> the soundboard. then he placed a heavy beam across the rim and with a
> turniquiot[spelling?} pulled the sound board up to open up the cuts in the
> bridge to a predetermind measurement. then he taped of the side of the
bridge at
> the cuts and filled them with west epoxy to dry overnight. the next day he
would
> remove all the stuff and go on to rebuild the piano.  he says the tone is
nicely
> improved.
> any thoughts
> wayne
>
> p.s. is there really  20 tons of pressure on the soundboard or is that on
the
> frame and the pressure at downbearing at the bridge is something different
>
>