Baldwin SD-10

[Charles E Faulk]

The inner rim of an SD-10 is something like 1 1/2" thick plus. There is
plenty of surface to glue the soundboard and still leave the gap.
Theoretically the inner rim is also supposed to be rabbetted at a slight
upward angle to the inside to accomodate the crown of the soundboard.

Charles Faulk

On Thu, 6 Sep 2001 07:48:38 -0400 "Farrell" <mfarrel2@tampabay.rr.com>
writes:
> > The soundboard was designed to leave it approximately 5/8" short of 
> the
> > outer rim all along the perimeter. The rationale, if I remember
> > correctly, was to give the sound board room for expansion or 
> contraction
> > depending on the season.
> 
> So is the soundboard not glued to the inner rim so as to allow it to 
> expand
> to the outer rim? Or is it glued, and they simply designed the inner 
> rim to
> compress as the soundboard expands toward the outer rim? Kinda hard 
> to
> figure.
> 
> Terry Farrell
> 
> ----- Original Message -----
> From: "Charles E Faulk" <cfaulk2@juno.com>
> To: <pianotech@ptg.org>
> Sent: Wednesday, September 05, 2001 10:21 PM
> Subject: Re: Baldwin SD-10
> 
> 
> > Phil,
> >
> > The Baldwin SD-10 is a good quality piano. However it bears many 
> of
> > Harold Conklin's design quirks.
> >
> > Capping the bridge may not prove harmful to the piano, but it 
> would be
> > just a good to repair the cracks with epoxy and move on.
> >
> > The soundboard was designed to leave it approximately 5/8" short 
> of the
> > outer rim all along the perimeter. The rationale, if I remember
> > correctly, was to give the sound board room for expansion or 
> contraction
> > depending on the season. There is no 'channel' per se; just a gap 
> between
> > the soundboard and the outer rim.
> >
> > The bridge pins are supposed to be 17 degrees off of 
> perpendicular.
> > Considering that these are drilled by hand, there is plenty of 
> room for
> > mistakes.
> >
> > The notches are routed into the inner rim using  a 1 1/14" rounded
> > cutting bit with an unusually long shank. The ribs are supposed to 
> have a
> > little clearance from the top of the inner rim. They are designed 
> to
> > 'float' to the edge of the soundboard without contact with the 
> rim.
> >
> > My memory of such things is about 14 years old, but that's about 
> the best
> > I can describe it.
> >
> > Regards,
> >
> > Charles Faulk RPT
> >
> > On Thu, 06 Sep 2001 00:30:14  0000 "Phillip L Ford" 
> <fordpiano@lycos.com>
> > writes:
> > >      I am currently rebuilding a 1982 SD-10.  I have never 
> rebuilt
> > > one before
> > > and have tuned or serviced only a few.  This one has fairly bad
> > > bridge
> > > cracks in the top section of the long bridge and in the unichord
> > > section
> > > of the bass bridge.  One of the other pianos that I've serviced 
> also
> > > had
> > > this problem although not as severe.  Is this typical of these
> > > pianos?
> > > Although the bridge is vertically laminated with no cap I'm 
> planning
> > > to
> > > put on a cap to deal with the cracking problem?  Does anyone 
> have
> > > any
> > > comments about putting a cap on a bridge like this?
> > >      A few other observations:
> > >   The angle of the bridge pins coming out of the bridges seems 
> quite
> > > severe
> > > to me and is I assume part of the reason for the bridge 
> cracking.
> > >   The soundboard does not come all the way to the outer rim.  
> There
> > > is a
> > > groove or channel between the soundboard and the outer rim that 
> goes
> > > down to the inner rim.  It appears to have been cut after the
> > > soundboard
> > > was installed.  Does anyone know the reason for this?
> > >   Looking down into the groove one can see the ends of the 
> relief
> > > cuts
> > > where the ribs are let in to the inner rim.  The ends of these 
> cuts
> > > are
> > > rounded as if they were cut with a router or mill.  The ends of 
> the
> > > ribs
> > > are squared and do not come all the way to the end of the relief
> > > cuts.
> > > I had always assumed that good quality pianos were built with 
> the
> > > ribs
> > > closely fitted to their relief pockets and soundboards always 
> ending
> > > at
> > > the outer rim, but apparently this is not always the case.
> > >
> > > Phil
> > >
> > > ---
> > > Phillip Ford
> > > Piano Service & Restoration
> > > 1777 Yosemite Ave
> > > San Francisco, CA  94124
> > >
> > >
> > > Get 250 color business cards for FREE!
> > > http://businesscards.lycos.com/vp/fastpath/
> >
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