> -----Oorspronkelijk bericht----- > Van: pianotech-bounces@ptg.org > [mailto:pianotech-bounces@ptg.org] Namens Ron Nossaman > Verzonden: dinsdag 17 december 2002 15:25 > Aan: Pianotech > Onderwerp: RE: Soundboardcrown > > > > > > > Peter, > From your description, I wouldn't expect your board to have > done anything > else but go flat when you dried it. I do not say and don't have said the board was going flat by drying it. I only eye-checked it and saw that some crown has disappeared compare whith the crown the board gets when it comes out of the press. I don't have checked it with a straight piece of wood. It was just by eye. I really doubted it to dry it before gluing on the ribs; but because I've placed last year a new bord in a Bechstein (no, I did not made it myself) and because I did not have much crown either with that board and because this piano sounded really very nice, (believe me I'm not the only one who's saying this and who have heard it sounding) I've not done it. I dried this soundboard also before gluing it in the piano, for the reason you can read one alinea down. >Why would you dry it to > glue it in the > piano when you apparently didn't to glue on the ribs? I don't > understand. It is not that difficult to understand. When you dry it, it became flat to place it in the piano; when it's done, because of the higher humidity of the environment, it has to swell, ie taking an arc because it can't move freely anymore due to the glue. > As Del said, I hope you can get the ribs off without > destroying the panel > so you can start over again. In the four years or so that > you've posted to > the list, at least a month's worth of reading has been posted > on soundboard > crowning methods and expected results. Please go back and > read some of this > stuff, particularly the differences between rib crowning and panel > (compression) crowning. Believe me, I do understand it (Just for explanation: I've read and studied the compilation of articles published in the Journal the PTG has done concerning soundboards). Rib crowning helps you getting more consistant soundboardcrown for a longer period of time, but for the sound, using either crowned or flat ribs does not change anything to the sound, as far as I know. I only know that using compression crowning needs more force to bend ribs and board and, I have to say, I hope that using this method gives more strenght and stiffnes to the ribs (ie, soundboard). Isn't this the ultimate goal? Please do correct me if I'm wrong. Greetings, Peter > > Ron N > > _______________________________________________ > pianotech list info: https://www.moypiano.com/resources/#archives > >
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