Thank you for all your comments Del. I appreciate them big time. While I feel very comfortable accepting info like '45 lbs. pressure produces optimal rib-to-soundboard glue joints' and other stuff, I just can't picture this one. Ron N. says the same as you. I have no doubt you are right.......buuuut. Well, I guess you know what I have to do! I'm gonna cut this short because I'm gonna tune some pie-annas this week, and I'm gonna get some good sleep, and I'm gonna buy me some wood, and then I'm a gonna build me a soundboard.........soon. (I guess I need to build a press, do some experimenting, and tear apart an old piano first!) Night, night! Terry Farrell ----- Original Message ----- From: "Delwin D Fandrich" <pianobuilders@olynet.com> To: <pianotech@ptg.org> Sent: Monday, February 18, 2002 1:27 AM Subject: Re: Bridge Crown > > ----- Original Message ----- > From: "Farrell" <mfarrel2@tampabay.rr.com> > To: <pianotech@ptg.org> > Sent: February 17, 2002 7:06 AM > Subject: Bridge Crown > > > > When building a new bridge, my understanding is that you will want to put > a concave curve along the long axis of the bridge bottom (or maybe you will > even want to modify an old bridge that does not seem to have the proper > bottom curve). But how much curve? I strongly suspect no approach to this > will be perfect, but we presumably should have some target in mind. Do we > clamp the soundboard into the piano (or install it), let it equilibrate with > the shop environment (letting it achieve its normal crown), and then attempt > to put the same crown as the soundboard has inversely on the bottom of the > bridge? Or do we want to guess at how much the board will compress under > string load and target that curve/crown? Or do we want to approach it in > some other manner? Or just put a 60-foot radius on the bridge bottom and get > some sleep? > > > > > Save yourself some anxiety and catch up on that sleep. Leave it flat. > > Del >
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