"Chris Friesen" wrote in message
...
C & S wrote:
I just received FWW 194 in the mail. The article "Get Serious About
Clamping" attempts to tell us that we are all underclamping our work.
While
Roman Rabeij chose not to "blind us with the science" he makes the
assertion
that we really ought to have 1200 lbs/sq inch of clamping force to glue
together flatsawn sugar maple.

Franklin recommends 175-250psi for Titebond III on hardwoods.

I know a local maker of bass guitars that uses a 20-ton steel press for
gluing up laminated body blanks. He uses custom-made 1-inch thick steel
plates top and bottom because weaker materials kept bending.

Of course you can get very acceptable joints with much less pressure than
this, especially if your mating surfaces are well machined and in good
condition.

But how much pressure is it, really? 20 tons spread over one square foot is
277 lbs/sq. inch.

- Owen -