Tail cuts, Pin cuts, Fig. 29 – INCRA Ultra 24 User Manual
Page 14: Detail 29a, Fig. 30, Fig. 31, Fig. 33, Fig. 32
14
Tail Cuts
To create the tails, start by cutting a dovetail shaped rabbet on
both ends of two of your boards. See Fig. 29. The rabbet
needs to be
7
/
32
" wide. See Detail 29a. DO NOT cut the full
width of the rabbet in one pass. Instead use 3 or 4 light side by
side passes.
Now clamp the boards to your INCRA Right Angle Fixture
as shown in Fig. 31 and make cuts at the scale locations shown
on the top half of the drawing in Fig. 30. Make sure you are
reading from the floating scale set in Step 2 on page 13. As
always, with good router table technique, “sneak up” to the first cut
(
1
/
8
") in several light side by side passes to avoid splintering the
edge of the stock. After completing the cuts, flip the boards over
and repeat the same cuts. Your two tail boards are now complete.
Pin Cuts
Set your INCRA JIG ULTRA to the first scale setting shown on
the BOTTOM half of the drawing in Fig. 30 (
9
/
16
"). Position an
INCRA Stop on the fence with the plastic stop strip as close as
possible to the dovetail bit and clamp in place. (The plastic
stop strip should not be touching the router bit.) See Fig. 32.
The INCRA Stop is used to limit the length of the pin cuts.
Place one of the remaining two boards face down on the
router table as shown in Fig. 33 and make cuts at the scale
locations shown on the BOTTOM half of the drawing in Fig. 30.
Be sure to use a good rubber soled push block as shown.
Make the cuts on only one end of the board for now. After
making the four cuts, check the fit between this pin board and
one of your tail boards. If the tails don’t fit all the way into the
pins simply lengthen the pin cuts by moving the INCRA Stop
away from the bit. Recut the pin board and again check the fit.
Once you have a flush fit, make the pin cuts on the opposite
end of the board and on both ends of the remaining board.
Clamp two
boards with
rabbets
facing out
as shown
FIG. 29
Cut the rabbets
Detail
29a
Rabbet
width
Dovetail shaped rabbets
cut on both ends of two
of your boards
Rubber
soled push
block
7
/
32
" wide
rabbet
FIG. 30
Equally
spaced
1
/
2
"
14
°
dovetail
FIG. 31
Cut the tails
FIG. 33
Cut the pins
3
3
/
16
"
2
5
/
16
"
1
7
/
16
"
9
/
16
"
3
5
/
8
"
2
3
/
4
"
1
7
/
8
"
1
/
8
"
1"
Wooden
handscrew
clamp
Rubber
soled
push
block
FIG. 32
Stop for pin cuts
Make cuts at the following scale
settings (use floating scale):
1
/
8
", 1", 1
7
/
8
", 2
3
/
4
", 3
5
/
8
"
Make cuts at the following scale
settings (use floating scale):
9
/
16
", 1
7
/
16
", 2
5
/
16
", 3
3
/
16
"
Position INCRA Stop
on outfeed side of bit
as close as possible
to cutting wing