Fw: D hammers

[David Love]

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