I'm making a maple table with a bowed apron about 55" x 3 1/2" x 3/4".
Using slow-curing expoxy I glued-up five 5/32" thick laminates to make up
the apron. Upon releasing the clamps, the laminates separated at several
points.
I've never had trouble with this method before, using cherry. Does anyone
have an idea what went wrong? Is there a problem with the epoxy/maple
combination?
What glue do people use for this application? I don't think I could spread
carpenter's glue fast enough. Polyurethane glue?
Ted Cody
Sometimes it is helpful to spread the epoxy on the surfaces to soak in
some and then apply additional epoxy before clamping.
The good thing about epoxy is you might be able to pull apart the bond
by applying a heat gun and slowly prying the join apart.
Ted Cody wrote:
>I'm making a maple table with a bowed apron about 55" x 3 1/2" x 3/4".
>
>Using slow-curing expoxy I glued-up five 5/32" thick laminates to make up
>the apron. Upon releasing the clamps, the laminates separated at several
>points.
>
>I've never had trouble with this method before, using cherry. Does anyone
>have an idea what went wrong? Is there a problem with the epoxy/maple
>combination?
>
>What glue do people use for this application? I don't think I could spread
>carpenter's glue fast enough. Polyurethane glue?
>
>Ted Cody
>
>
>
>
On 21-Jan-2004, "Lew Hodgett" <[email protected]> wrote:
> maple should be no problem.
Is it possible that the clamping pressure was so high that not
enough epoxy remained? In general, polyurethane = tight clamp,
epoxy = not so tight, or so I've always understood.
Mike
Probably a combination of low temperature and poor mixiong. Possibly older
epoxy.
For gluing up laminations, you are better off with Unibond 800. It's made for
such a purpose, and can be worked afterwards. Even Titebond will do the job,
but will eventually creep. The Unibond won't, and it can be colored with small
amounts of anilyne dye.
"Ted Cody" writes:
> I'm making a maple table with a bowed apron about 55" x 3 1/2" x 3/4".
>
> Using slow-curing expoxy I glued-up five 5/32" thick laminates to make up
> the apron. Upon releasing the clamps, the laminates separated at several
> points.
>
> I've never had trouble with this method before, using cherry. Does anyone
> have an idea what went wrong? Is there a problem with the epoxy/maple
> combination?
<snip>
Some possibilities come to mind.
1) Incomplete mixing.
2) Low temperature during cure. (I find that anything below 60F really
extends the cure time)
White oak is a problem with epoxy, but maple should be no problem.
HTH
--
Lew
S/A: Challenge, The Bullet Proof Boat, (Under Construction in the Southland)
Visit: <http://home.earthlink.net/~lewhodgett> for Pictures
On Thu, 22 Jan 2004 04:08:31 GMT, "Ted Cody" <[email protected]>
wrote:
>I'm making a maple table with a bowed apron about 55" x 3 1/2" x 3/4".
>
>Using slow-curing expoxy I glued-up five 5/32" thick laminates to make up
>the apron. Upon releasing the clamps, the laminates separated at several
>points.
>
>I've never had trouble with this method before, using cherry. Does anyone
>have an idea what went wrong? Is there a problem with the epoxy/maple
>combination?
>
>What glue do people use for this application? I don't think I could spread
>carpenter's glue fast enough. Polyurethane glue?
>
>Ted Cody
>
as far as I know there should be no problem with maple and epoxy.