Box Joints.pdf

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Joints
Spread glue
on top of
ingers
Gluing up box joints can be a tedious job.
But there are a few things you can do to
make the task easier.
Dry Fit. The irst is making sure the joint
its together well. Joints that are cut prop-
erly should come together smoothly. If
there are gaps or the joint slides together
too easily, then the glue won’t hold. If it
takes more than a few light taps with a
mallet, the box joints are too tight with
no room for glue.
SpreaDing glue. The big advantage of
box joints is the amount of gluing sur-
face the interlocking ingers create. There
are a lot of surfaces for the glue to “grab”
to create a rock-solid joint. But, you re-
ally don’t need to put glue on every
Apply tape
up to edge
of ingers
Bottoms of
ingers don’t
need glue
surface. I like to use an artist’s brush to
spread glue on just the top of each in-
ger.
aDDitional tipS. As you assemble the
joint, glue spreads to exposed surfaces.
But there are a couple of ways to control
it. You can place masking tape next to the
pins before glueup.
This shields the in-
side corners where
it’s tough to clean
up any squeezout.
After the glue has
skinned over, just
pull off the tape,
taking the excess
glue with it (inset
photo).
Also, lightly
sanding the ends
of the ingers with
220-grit sandpa-
per will help keep
glue from seeping
into the end grain
where it’s more
dificult to remove.
Another option is
to cut the ingers
slightly longer.
This way, when
you trim them
lush, any excess
glue is removed.
Glue Squeezeout. Capture excess glue
with painter’s tape. It releases
easy and doesn’t leave a residue.
evenly and pulls the joints tight.
Clamping. Position a set of blocks and clamps next to the fingers at
each corner. This distributes pressure evenly and pulls the joints tight.
Clamping. The last step to success in glu-
ing up a perfect box joint is clamping. If
the ingers stand proud of the sides, you
can’t really apply clamps directly on the
corners to pull the joints tight. But there
is one thing you can do to make clamp-
ing the joints easier.
The answer is to use clamping blocks
positioned alongside the joints. You can
see what I mean in the left photo.
This works especially well when us-
ing bar clamps for larger projects. (For
small projects that don’t require much
pressure, you can wrap a band clamp
around the whole assembly.)
Apply these simple steps to your next
project that includes box joints. You’re
guaranteed to get better-looking and
tighter-itting joints.
www.australianwoodsmith.com.au
Australian Woodsmith
No. 68
Box
W
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