5.5 is beginning to sound more like it. ----- Original Message ----- From: "David Love" <davidlovepianos at comcast.net> To: "'Pianotech List'" <pianotech at ptg.org> Sent: Saturday, April 15, 2006 12:05 PM Subject: RE: Buttressed Arch. Question for Ron N. > >From a design novices perspective, ribbing the panel at a 60' radius through > the panel and 6% emc seems inadequate to form enough crown especially in the > upper end of the piano. > > David Love > davidlovepianos at comcast.net > > -----Original Message----- > From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf > Of Fenton Murray > Sent: Saturday, April 15, 2006 11:39 AM > To: Pianotech List > Subject: Re: Buttressed Arch. Question for Ron N. > > How are you > crowning boards, incidentally? > Ron, > I'm doing my first solo flight on an upright. Ribs at 60'. Go bar press. > Getting ready to rib the panel at emc about 6. RH in my area typically in > the 60's all year. > ----- Original Message ----- > From: "Ron Nossaman" <rnossaman at cox.net> > To: "Pianotech List" <pianotech at ptg.org> > Sent: Saturday, April 15, 2006 8:03 AM > Subject: Re: Buttressed Arch. Question for Ron N. > > > > > > > Yes, better, thank you. As one guy building soundboards, I'm not sure > how to > > > use this info. but it helps me to understand the system. > > > > That's what the information is for - understanding what is, > > and more important in this case, what is not. How are you > > crowning boards, incidentally? > > > > > > >IS there a force > > > pushing the rim out, > > > > No, there is not. There is some rotational force on the belly > > rail from string downbearing because it's cantilevered, but it > > has no affect on crown. > > > > > > > > >and is there any advantage to trying to make that rim > > > immoveable, > > > > Absolutely. I routinely add bracing to the straight side, and > > particularly to the belly rail (mass too, here). It doesn't do > > the slightest thing for crown, but it raises the impedance of > > the rim and belly rail so it absorbs less of the soundboard's > > energy, improving tone and sustain. > > > > > > >and is there a consequence to it moving with respect to the > > > soundboard? > > > > Yes, it absorbs energy that should ideally stay in the soundboard. > > Ron N > > > > > > > > > > >
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