Hi Robin, Could you elaborate on how you were able to measure the crown on your Sohmner? I have a 7 foot, serial # 25512 model #11 in my shop, and am pondering how to measure the crown with that maple reinforcing strip in the way. I don't think that this piano has any crown, but would love to hear your method. Thanks, Owen. ----- Original Message ----- From: "Robin Hufford" <hufford1@airmail.net> To: <pianotech@ptg.org> Sent: Thursday, March 21, 2002 3:45 AM Subject: Re: Sohmer > Dale, > I have a Sohmer 9B in the shop. It has conventional crown which is > about 1/8 in the middle. This is after restringing and being within 1/2 > step of pitch. I think these are great pianos and I like their bridge > agraffe system. This particular Sohmer had a very pronounced long crack > running about an inch and a half or so in front of the bridge. This > crack, which I have seen on several other Sohmers in virtually the same > configuration, is obvious stress relief from the forces produced by the > bridge operating and pulling on the board, that is, relief of shearing > stresses. Usually, there is about an eighth of an inch or more of > offset in height between the two parts of the board where this occurs. > In the one in the shop the ribs were dowelled to the board in this > area and the crack was filled with epoxy. This crack is about the only > characteristic failure of the c. 6 feet Sohmers with the agraffe system > I have seen, although, as I have seen perhaps, only 8 or 9 over the > years, this may be a generalization on shaky grounds. The factory, > apparently, was aware of this as they have attached on the botton side > of the board, under the bridge, a long reinforcing strip of maple, let > in and passing through the ribs. The crack occurs in front of this > strip. > As to the agraffe termination at the bridge, I think this works > quite well and, is probably a better, but more expensive mousetrap. > Perhaps the expense is not that much more than the conventional method > but I would guess that it would be as the bridge requires, of course, > planing, notching of a somewhat different fashion, the maple strip, > notching of ribs, AND an agraffe and its installation. The ringtime of > this system seems distinctly superior to my ear in comparison to the > conventional method. > Regards, Robin Hufford > > Erwinspiano@AOL.COM wrote: > > > Part 1.1 Type: Plain Text (text/plain) > > Encoding: 7bit >
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