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/ > > > > ________________________________________________________________ > > GET INTERNET ACCESS FROM JUNO! > > Juno offers FREE or PREMIUM Internet access for less! > > Join Juno today! For your FREE software, visit: > > http://dl.www.juno.com/get/tagj. > ________________________________________________________________ GET INTERNET ACCESS FROM JUNO! Juno offers FREE or PREMIUM Internet access for less! Join Juno today! For your FREE software, visit: http://dl.www.juno.com/get/tagj.
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