How is the length and position of the cutoff bar calculated? David Love davidlovepianos@earthlink.net > [Original Message] > From: Ron Nossaman <RNossaman@cox.net> > To: Pianotech <pianotech@ptg.org>; <davidlovepianos@earthlink.net> > Date: 4/25/2003 5:31:57 PM > Subject: RE: Fw: D hammers > > > >That's it, thanks. Of what purpose is the soundboard cutoff bar? > > To shorten the ribs, for better stiffness control, and to eliminate an > unneeded area of the board for a better progression of diaphragm response > through the scale. Without the cutoff, there's too much soundboard for the > frequencies there, which produces conflicting resonance modes rather than > working as a unit. > > > >I presume from the name that it attaches to the underside of the soundboard? > > Yes, and to the beams underneath. It redefines and becomes the rim for the > soundboard. > > > >If so, in what manner is it attached and is it crowned to match the > >curvature of the board at that point? > > > >David Love > > It's glued and doweled, no crown - flat. The board doesn't mind. > > Ron N
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