Joining - Procedure - Festool DOMINO DF 500 Guide D'utilisation

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Domino tenon should be approximately 1/3 the
thickness of the workpieces.
• It is acceptable to use a tenon that is slightly
thicker than 1/3 when the width of the Domino
tenon is relatively narrow compared to the width
of the joint. This is why 8mm Domino tenons are
the most common for joining ¾-inch lumber.
• For softer woods, such as pine, the joint will be
stronger when the tenon is 1/3 or slightly less.
• For plywoods, especially low-grade construction
plywoods, the Domino tenon is much stronger
than the surrounding wood, so it is best to maxi-
mize the strength of the substrate by minimizing
the thickness of the tenon.
Domino Tenon Placement Guidelines
There are no steadfast rules on where tenons
should be placed, especially when they are used
for alignment purposes. For edge joining boards, a
typical placement might be 6 to 8 inches apart.
However, when tenons are used to strengthen a
joint, you might be tempted to place the tenons too
close together. This can actually weaken the joint by
removing too much of the substrate material.
• A wide mortise weakens the substrate, so it is
better to have several narrow mortises with un-
cut space in between, than it is to have a single
wide mortise with several tenons side-by-side.
• When placing several tenons close together,
leave at least twice the tenon thickness between
mortise holes. As a general rule, this means the
minimum tenon spacing should be about 10 mm
to 20 mm, but they can be spaced much wider.
d d
16
• When creating stacked mortises for extra thick
lumber, an extension of the "1/3 rule" mentioned
above still applies. Specifically, the distance
between mortises, and the distance between a
mortise and the wood surface should all be equal
to (or larger than) the thickness of the tenon.
d d
17
m in. 2d m in. 2d m in. 2d
m in. d m in. d m in. d
m in. d m in. d m in. d
m in. d m in. d m in. d

Joining - Procedure

Proceed as follows to create a dowelled joint:
– Select a Domino dowel and insert a matching
jointing bit in the Domino dowel jointer.
– Set the jointing depth. The jointing depth must be
at least 3 mm smaller than the workpiece thick-
ness so that the dowelled joint is supportable.
– Set the jointing height to correspond to the work-
piece thickness.
18.1
18.2
1
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– Mark the areas on the workpiece that belong
together [18.1] so that you will be able to join
them correctly again once you have cut the dowel
holes.
– Position the two workpieces to be joined against
one another and mark the desired positions of
the dowels with a pencil [18.2].
1
– Set the desired dowel-hole width [19.1].
Our recommendation: Cut the fi rst hole without play
(dowel-hole width = Domino dowel width), and the
remaining dowel holes to the next largest dowel-
hole width. The fi rst dowel hole therefore serves
as a reference dimension, whereas the remaining
dowel holes have tolerance for manufacturing in-
accuracies.
19.1