Rib Thinning

[Farrell]

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Hi Ric, sounds like you are moving along nicely on your project. My =
understanding is that there are two trains of thought on this issue.=20

The first is a perhaps traditional view that suggests the panel must fit =
snugly to the edge - I think this is part of the "circle of sound" thing =
and reflecting soundwaves or vibrations or whatever. Like maybe the =
sound might leak out the edge of the panel? Andre Bolduc pours =
fiberglass resin into any gaps between soundboard panel edge and the =
inside surface of the outer rim.

I think some more progressive thinking (IMHO) suggests that all you need =
to do is have the edge of the soundboard firmly attached (glued) to the =
inner rim. If the edge of the soundboard is immobilized (glued to the =
inner rim), you have done all that matters.

If the board is now a little smaller than when you took it out, your =
locator marks aren't going to be super useful in trying to figure out =
where to position the soundboard. Likely the best method will be to get =
the bridges optimally located. If you measured the original speaking =
lengths, try a combination of reproducing the original speaking lengths =
and good alignment of the speaking and backscale portions of the strings =
(assuming they were aligned to begin with - perhaps a big assumption!). =
If you have good photographs of the original alignment, you can refer to =
those. Presumably, the bridges have not changed dimensions much.

Keep us informed. Photographs?

Terry Farrell

----- Original Message -----=20
From: "Richard Brekne" <Richard.Brekne@grieg.uib.no>
To: "Newtonburg" <pianotech@ptg.org>
Sent: Tuesday, January 27, 2004 9:34 AM
Subject: Rib Thinning


> Hi folks
>=20
> Finished trimming and sanding down the ribs for the soundboard of this =

> old C.C.Lose square and went to see how it fit into the <<rim>> of the =

> instrument. I noticed right away it had shrunk down quite a bit.. Of=20
> course it has a slight crown to it now, but that isnt going  subtract=20
> much. Looks to have shrunk in cross grain about 6-7 mm at its widest =
(60=20
> cm). There is still enough to get a  decent enough bite on the rim, =
but=20
> it was a tight fit coming out. So the question is... is it advisable =
to=20
> add a little strip on one of the edges so that the cross grain width =
of=20
> this panel fits tight going in dry ? Or is it advisable to leave =
things=20
> as they are.. Centered, each edge has about  5 mm of panel over the=20
> edges of  the rim on either side.
>=20
> Thanks for any advices,
>=20
> RicB
> _______________________________________________
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> 
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