Crowned ribs, panel dried to very very dry emc before rib up. Heavily reliant on panel compression and they make a big deal out of along putting the board under along the grain <<tension>> (which in most European garb means "stress") Essentially they put the panel into both cross grain compression crown, and bent crown along the grain. If memory serves right they use both the bridge and the rim to get the degree of along the grain crown they want before applying down bearing from the string plane. Udo was in Helsinki at the Nordic a couple years back. He got into some detail about the differences between how/when Steinway Hamburg glues their bridge on and how they do it. I don't remember the details now, but I do know that Steinway Hamburg rib crowns, and dries their panels out to about 5.5 % at rib up, then place their panels in a hotbox for some few days before gluing on the bridge. FWIW. Cheers RicB Hi Dale, If memory serves, Steingraeber does crown their ribs. Alan Eder I recently played a 7 ft Steingraebber at David Andersen. I don't play well but this thing sucked the music out of my finger tips. It was ethereal & glorious. If I had money I would have bought the piano quit my job & taken piano lesson. Truly my tonal pocket. Very tight grain panel. 25 per inch. By the way.. I have this reaction to all the Steingraebbers I've played. Interestingly, speaking to UDO Steingraebber last year,said they glue there bridge on first in some form of curved caul to the board obviously subscribing to the theory of the bridge being a long supporting member(or double crowning) Then the ribs go on. I don't know if crowned or flat. -----Original Message----- From: erwinspiano at aol.com To: pianotech at ptg.org Sent: Fri, 13 Mar 2009 8:26 am Subject: Re: [pianotech] #2 Soundboard Wood
This PTG archive page provided courtesy of Moy Piano Service, LLC