DIYbanter - View Single Post

J. Clarke[_2_]

In article ,
says...

On 10/4/10 8:32 PM, J. Clarke wrote:
In ,
says...

On 10/4/10 2:53 PM, J. Clarke wrote:
In ,
says...

On 10/4/10 9:24 AM, J. Clarke wrote:
To some it seems to be a common thought that it is OK to remove excess glue
by squeezing the bejesus out of a panel glue up, which it is. But for some
reason there is the belief of excess glue being removed from a joint by the
sliding and scraping motion during assembly will starve the joint.

In the one case it's being forced into the grain, in the other it's
being scraped off.

Not correct. Leon is correct. You cannot force (carpenters) glue into
the grain of wood. It goes in as far as it goes and that's it.

Of course you can. There is porosity there, apply pressure and the glue
goes into the pores.

The path of least resistance in a panel glue-up is up, down, and out at
the seems, not into the pores.

Fluid flow is not quite as simple as you make it out to be.

And gluing is not as complex as you're making it out to be.

Well, actually if you get down to the hydrodynamics of it, it is.

It would take a lot more pressure than
that for glue to go any further into wood pores than it would from
passive wicking.

More pressure than what?

More pressure than clamping up panels produces, when allowing the excess
glue to push out.

Nobody has suggested "more pressure than clamping up panels produces".

It's a moot point, however, as it is simply unnecessary.

What is unnecessary?

Allowing "room for glue" in a M&T joint.

Please post your test results that demonstrate that joints that have
less clearance that the recommended glue line thickness are just as
strong as those that have the recommended glue line thickness.

I remember reading and being amazed at how little glue is actually
needed to bond wood together. I also remember in the same article that
it mentioned if *any* glue was soaked into the grain, it was *enough*
glue. Meaning, if you put a thin layer of glue on and it gets wiped off
the surface, you're ok.

I remember reading a lot of stuff. The fact that you read something
doesn't make it true. Don't believe me, read "Mein Kampf".

It doesn't make it untrue, either.

No, but "I read somewhere" is not to be trusted.

Well you know, I wish I could cite the source or point to a web site,
but it was years ago in a respected trade mag.

What trade?

I also have my
experience to go by and a quart of glue goes a long long way with me.
And as little as I use, I still usually end up cleaning up 10x as much
glue as remains in the joint. :-) No failures.

So how many structural joints that you have made depend entirely on the
glue for their strength?

I'm sorry, but "I've been getting away with this for years" doesn't show
that you are getting optimal bond quality, just that it's good enough
for whatever you are doing. If you're working with 10:1 margins you can
get away with quite a lot.