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Roger Hayter[_2_]

jim k wrote:

(Roger Hayter) Wrote in message:
John Rumm wrote:

On 26/11/2017 14:33, Roger Hayter wrote:
snip

Actually I have re-examined the problem and it looks as though there may
be something in my original theory that the plaster may have had a
chemical effect, rather than purely acting as a reservoir of water.
The wooden blocks themselves have hardly warped but the three glued
joints between the blocks have widened on the plaster side from an
imperceptible width before to about 1/2 a millimeter now. This seems a
more destructive effect on the glue than I would expect from plain water
seeing that this wood is sold for kitchen use with only light varnish.

That could equally be the effect of the timber drying out again and
shrinking. If it does that differentially over the thickness then
something splitting is not unexpected.

Good point, I should have looked more carefully when it first happened.

Is the whole piece straightening back out any yet?

No. Though it has probably stopped getting worse.The total deflection
is about 8mm in 150mm.

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Roger Hayter