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Art Ransom wrote:
How much clamping pressure is too much?
I have created starved joints ( not enough glue to hold properly)
with
Gorilla glue when clamping segmented rings but to my knowledge that
is the
only time I have made starved joints. The laminated beams I use in
some of
my project are clamped with 30,000 lbs pressure, though the
manufacture
doesn't say if that is PSI or total clamping pressure.
This has become a concern since I have been turning 8' columns. My
normal
procedure is to cut the stave 1/4" over size and let the stock set
for
several days for the internal stresses to stop warping the wood. I
then cut
and mill the staves to final size. Milling the bird mouth joint ,
final
sizing and normal wood movement will at times result in considerable
warping
in the 8' staves and when working with 8/4 stock a lot of clamping
pressure
is needed to get properly fitting joints.

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