Klarinet Archive - Posting 000778.txt from 1999/10

From: Roger Shilcock <roger.shilcock@-----.uk>
Subj: Re: [kl] cracks -- possible wood treatment?
Date: Tue, 26 Oct 1999 13:21:38 -0400

Marine archaeologists use polyglycol to preserve ships'timbers, don't
they?
Do you carve the wood with the glycol still in it? If not, how do you get
rid of it?
Presumably it increases the density of the wood - and so the weight of any
artefact made from it - quite considerably.
Roger Shilcock

On Tue, 26 Oct 1999, jim and joyce wrote:

> Date: Tue, 26 Oct 1999 13:09:29 -0400
> From: jim and joyce <lande@-----.com>
> Reply-To: klarinet@-----.org
> To: "klarinet@-----.org>
> Subject: [kl] cracks -- possible wood treatment?
>
> Dee
> I agree with your conclusion -- that some pieces of wood are going
> to crack
> no matter what. Woodworkers talk about 'compression' and 'tension'
> wood. ---
> that is, parts of the tree that grow under compression (below a limb,
> for example) or
> under tension (if a tree leans away from one side, that side may get
> pulled as it
> grows). The result is that as moisture content changes some pieces of
> wood will
> expand and contract significantly more than other parts and that this
> causes warping
> and cracking. Thus, the flaw would be in the structure of the wood,
> not in some
> hidden or almost invisible crack. As to the amount of force generated,
> wood
> wedges were used to split stone. Wood was inserted into stone and then
> soaked to
> swell it. I have seen a picture of an oak board bolted at either end to
> a steel beam.
> The board cracked in half AGAINST THE GRAIN as a result of repeated
> changes in humidity.
>
> One way to stabilize wood for carving is to leave it soak in
> polyethylene Glycol
> until that chemical has displaced most internal water. I wonder
> whether wood so
> treated would be suitable for making clarinets?
>
> jim
>
>
>
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