Leigh D4R Pro, User Manual

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BOX JOINTS
58
Chapter 15 D4R Pro User Guide
15-19 3⁄4"[19mm] Box Joints
Set-up and space the guide
fingers exactly as for 3 ⁄
8
"[9mm] joints. Start with the same
e7-Bush
setting. See 15-2 thru 15-9.
Prepare four boards
using the board width chart for 3 ⁄
4
"[19mm]
joints
and number them
1
to
4
around the box
➀
with the com-
mon edges marked.
4
4
3
3
2
2
1
1
1
15-20
Rout both ends of boards
1
and
3
but only rout between
the guide finger openings ➀
not between the finger sides
➁
. Keep
the common edge against the side stop.
Hint: Mark the router base at the 12 o’clock position
➂
and steer
this mark along the
pointed ends of the fingers
at the rear of the
assembly.
3
1
2
2
2
2
2
1
1
1
3
1
15-21
Now rout both ends of boards
2
and
4
, with the common
edge against the side stop
but only rout between the finger sides ➁
not between the finger openings
➀
.
Hint: Now steer the base 12 o’clock mark between the pairs of
finger points ➂
.
2
2
2
2
3
2
1
1
1
1
4
2
15-22
Remove the board and fit the Spacer to the side stop with
number
3
showing
➃
. Now rout both ends of boards
2
and
4
again,
with the common edge against the Spacer and again …only rout
between the finger sides
➁
, not between the finger openings
➀
,
steering the router mark between the pairs of finger points
➂
.
3
4
4
2
2
2
2
2
2 1
1
1
1
15-23
With the Spacer still in position rout both ends of boards
1
and
3
, with the common edge against the Spacer and only rout
between the finger openings ➀
, steering the router mark along
the finger points
➂
.
3
4
3
1
2
2
2
2
2
1
1
1
1
15-24 Joint fit
Check for joint fit as usual, and repeat testing
if required. Theoretically, there will be nothing in the
3
⁄
4
"[19mm]
sockets, literally a zero thickness wall, where the bit has passed by
twice. However, routing tolerances can leave a very thin “
wall ”
uncleared by routing. This can be quickly removed with a chisel
or sandpaper.
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