DTJ300-600 08
OPERATION
– The piece of timber in the top clamp is
then butted up to this, so that both
pieces are flush under the template.
– The two pieces sit in the jig as shown
on the right.
Make sure that both pieces are
butted up against the horizontal / vertical
stops.
– Use the locking clamp handles to
secure the wood to the jig.
You may need
to adjust
the top and front clamp bars to suit
the
thickness of the timber using the clamp
adjusting screws at either end of each clamp
bar so that the wood is held firmly in place.
When narrow pieces of wood are being used,
place another piece of wood (exactly the same
thickness) underneath the clamp bar at the
opposite end to ensure an even grip on the
wood and to avoid distorting the bars.
Setting the Template Position
– Unlock the two template securing screws
and position the template so that the tips of
the fingers sit 3mm back from the edge of the
vertically mounted timber.
– Lock the template into position using the two
template securing screws.
Setting the Backstop
The distance the backstop needs to be positioned
from the front of the template fingers depends on
the size of router base fitted to your router, the
formula to calculate this is:
–
Set a micro-meter or Vernier calliper to the
Calculated depth and adjust the backstop as
Shown (next page).
–
Lock into place using the backstop locking
screws. It is not essential that this setting is exact
at this stage as final adjustments can be made
later on.
–
Ensure that the template and back stop stay
parallel with the front edge of the jig during this
setting procedure
Setting the Cutter Depth
–
Fit the bearing guided router bit securely into
the router collet
–
Adjust the cutter depth, until the bottom of the
router bit protrudes 10‐11 mm below the
template fingers.
–
You may need to fit a packing piece between the
template and the timber to ensure good contact
between the bearing and the slots in the template.
–
The cutting depth is critical to the final fit of the
joint, with as little as 0.5mm change in depth
making all the difference.
