Poor man's soundboard press

[Marcel Carey]

Hi Terry, I approve of your caution and thank you for it. The webbing
that I use is about as strong as metal for pull force. I'm going around
my cauls about 3 times before I apply the clamps. Before the straps
would break, I would expect the C-clamps to let the straps slip. But so
far, nothing moves. But I am very carefull when I apply the pressure and
I do so very slowly because the problem is that the cauls want to move
around a bit.
 
Marcel

-----Message d'origine-----
De : pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] De la
part de Farrell
Envoyé : 28 mars 2007 06:54
À : Pianotech List
Objet : Re: Poor man's soundboard press


Hi Marcel. I really meant to be serious with my comment. On a longer
rib, let's say one inch wide (many are wider) by 36 inches long (some
are longer), your rig is pushing your upper board upwards with 1800 lbs.
of force - that's like your retaining system supporting an old VW bug
with me inside it! It's really quite amazing how much force one can
generate with a simple setup like this.
 
I've had a couple slight mishaps with my presses with some pretty
dramatic results - usually just more scary than dangerous - but I think
that is perhaps because I overbuilt my presses.
 
It appears that the upper caul is retained by one velcro strip at each
end. If I am seeing that correctly, you might want to think about
slipping some sort of steel safety device around there also - just in
case......
 
I enjoy your input to this list - I just don't want to hear about you
having to have a caul-ectomy from your skull!  :-O
 
Terry Farrell

----- Original Message ----- 
I never said it was safe did I. But I'm limiting the pressure to
50pds/sq.inch and it was fine.
 
Marcel

-----Message d'origine-----

Aahhhhhhhhhh! Stand back!
 
Keep your disability insurance paid up!
 
Terry Farrell

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