Although what I meant was that longer backscale will require a greater angular measurement. David Love davidlovepianos@earthlink.net > [Original Message] > From: Farrell <mfarrel2@tampabay.rr.com> > To: Pianotech <pianotech@ptg.org> > Date: 5/13/2004 3:40:23 AM > Subject: Re: Crown in Bass Area & Downbearing > > I should probably backtrack somewhat on my statement of "very little crown > in the bass" - but only somewhat. I think many designs will have ribs in the > bass area that are cut to a 60-foot radius (some even larger). That to me is > little crown. Some soundboards are made from flat ribs and it seems it does > not take too terribly long on some of these to get flat-ish. These are > definitely little (or no, or negative) crown. Regarding downbearing on the > bass, I am aware that some reputable folks building and installing new > soundboards just have bass strings kiss the bass bridge top - zero > downbearing - regardless of backscale length. Apparently, they find that > works to their satisfaction with the design of their soundboards. > > As David points out, the expression of downbearing as a unit of length not > only lacks clarity, it is meaningless without a backscale length > specification. I wish downbearing was commonly characterized with an angular > measurement - or better yet, two angular measurements - bridge front and > back downbearings. > > Terry Farrell > > ----- Original Message ----- > From: "David Love" <davidlovepianos@earthlink.net> > To: "Pianotech" <pianotech@ptg.org> > Sent: Wednesday, May 12, 2004 10:59 PM > Subject: RE: Crown in Bass Area & Downbearing > > > > The amount of downbearing in the bass should, as I understand it, depend > on > > the backscale length. The greater the backscale length, the more > > downbearing is not only tolerated but needed in the bass area. A next to > > zero downbearing would probably be advisable where the backscale is > > extremely short. > > > > David Love > > davidlovepianos@earthlink.net > > > >But many designs incorporate very little crown in the bass and zero or > >nearly so bearing on the bass bridge. So how could you tell that such > >characteristics were a problem (at least in terms of deviation from > original > >design)? > > > >Terry Farrell > > > > Regarding bass crown, I'm not sure how much is design intent, and how much > > is the result of the cantilever under positive bearing destroying what > > crown was there. I tend toward the notion that the crown was originally > > there, designed or not, and the cantilever killed it - if it is indeed no > > longer there. The downbearing would ideally be dependent on the length of > > the back scale, like David Love said. I consider zero crown and zero > > bearing to be a problem in a piano with a conventional soundboard, > anywhere > > in the scale. > > > > Ron N > > > > > Terry said: "But many designs incorporate very little crown in the bass > > and > > > zero or > > > nearly so bearing on the bass bridge...." > > > > > > Terry, > > > Where did you get such an idea. It's simply not true! > > > Regards, > > > Joe Garrett, RPT, (Oregon) > > > _______________________________________________ > pianotech list info: https://www.moypiano.com/resources/#archives
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