FWW Article: "you can't be serious" abount clamping.

[J T]

Fri, Oct 5, 2007, 11:01am (EDT+4) [e-mail] (Phisherman) doth sayeth: Sounds like I've been doing it wrong all these years, yet not a single piece has fallen apart do to a bad glue up.

Had one glue joint fail. With Titebond II that had been below 50 degrees. Nice looking joint, but it popped apart with just a bit of pressure. Called the Titebond people (there IS a 1-800 number on the back of each container, for those of you without a clue), and, if I recall right, this was some years back, warmed it up, added a bit of water, shook the snot out of it. Whatever they told me, it worked, and the rest of the container performed quite satisfactorily. I still use Titebond II, and now make sure it doesn't stay overnight in the shop in the winter.

JOAT "I'm an Igor, thur. We don't athk quethtionth." "Really? Why not?" "I don't know, thur. I didn't athk."

[J T]

Fri, Oct 5, 2007, 7:24am (EDT-3) [e-mail] that and the fact there aren't any decent men's magazines for guys over 50.... =A0 =A0 =A0 ;^)

Hah! WoodenBoat, and CarCraft.

JOAT "I'm an Igor, thur. We don't athk quethtionth." "Really? Why not?" "I don't know, thur. I didn't athk."

[J T]

Fri, Oct 5, 2007, 9:58am (EDT-1) [e-mail] (Leon) doth claimeth: I'll set you up for that AARP magazine. ;~)

Tried it. Didn't renew. It's for "old" people.

JOAT "I'm an Igor, thur. We don't athk quethtionth." "Really? Why not?" "I don't know, thur. I didn't athk."

[Swingman]

"dpb" wrote

While the OP doesn't say what type of glue the article references, it makes you wonder how many thousands of pounds/sq in clamping force Stradivarius used on those violins still being played? :)

[dpb]

What the article says is "I'll assume you're using yellow (polyvinyl acetate--PVA) glue..."

The tome I posted previously that reference one of the good doctor's published papers used PVAc and U-F according to the abstract I was able to find.

Well, of course ol' Strad had the advantage of dividing by a small denominator to raise the pressure significantly... :)

Although, had they even invented pressure back then?

[Chris Friesen]

dpb linked to the abstract for one of the articles:

Basically, according to that article the optimum gluing pressure for PVA and sugar maple is .5 times the compression strength, or around 735psi.

However, they don't show the psi/glue strength curve, so the amount of strength loss at lower clamping pressures is not discussed.

Chris

[Swingman]

I'm often convinced it was invented strictly for my benefit ... parental, marital and financial.

[Robatoy]

.......now WHO is supposed to be the long-hair? *snickers*

[Robatoy]

"Results were subjected to regression analysis to ascertain relationships."

Well, shit... that explains it.

[Robatoy]

On Oct 5, 3:10 pm, [e-mail] (J T) wrote: Most of the time I clamp, or

Case in point: Look at all the laminating and veneering marvels taking place at a mere 14.6 PSIG..... in a vacuum bag.

[Swingman]

That's what an education will get you, Bubba ... a snicker? Besides, I hardly have enough to cover my ears.

[Robatoy]

Pretty soon I can cover MY ears from the inside out.

*smirk*

[Robatoy]

make that PSIA

[dpb]

:)

[FoggyTown]

Woodworking with Don Martin. That I would LOVE to have seen!

FoggyTown

[FoggyTown]

tight enough to squeeze the glue out of the joint? I'd have thought that going for 1,200 lb/sq in would have squeezed every atom of glue out long before it even got there.

FoggyTown

[willshak]

How about the Furniture Guys from TV, Ed Feldman and Joe L'Erario? I mistakenly typed 'furniture gays' in Google, but I don't think it was too far off. :-)

[J T]

Fri, Oct 5, 2007, 2:43pm (EDT-3) [e-mail] (Robatoy) doth sayeth: Pretty soon I can cover MY ears from the inside out.

Now you know the reason fire was stolen from the Gods.

JOAT "I'm an Igor, thur. We don't athk quethtionth." "Really? Why not?" "I don't know, thur. I didn't athk."

[John Cochran]

WHAT?!?!?!?

You don't have a high pressure chamber (that you can pressurize to 2000 PSI) with an attached vacuum line to deal with leakage.

You know, make your veneer sandwich in plastic bag. Enter pressure chamber. Attach vacuum line. Exit pressure chamber. Start vacuum. Start pressure (don't forget the 400 degree F heat) and wait while your new masterpiece is fused into one indivisable whole.

;)

[Dave Jackson]