Porter-Cable OMNIJIG 55160 Instruction Manual page 57

For the shelves (B1, B2 or B3) Fig. H3, the
rear edge is mounted vertically to the left of
the jig in order to cut the tenon.
After making the cuts for the project as laid
out in Fig. H3, the cuts will look like boards
A1 and A2 in Fig. H4. The exaggerated ta-
pers in the dado and on the tenon (Fig. H4)
help show the direction of the taper.
CAPACITY NOTE: When making the dado
cut, your boards need to be long enough to
allow the workpiece to be clamped down.
There must be at least 7" of material beyond
the center of the dado, shown as "X" in Fig
H5, to ensure good clamping. If you want
the distance (X) to be smaller than 7" in your
finished project, you can cut off the unwant-
ed portion after the dado cut is made.
TOP
BOTTOM
A1
X
Fig. H5
BOTTOM
TOP
A2
Fig. H4
X
End view of tenon board
B3
B1 B2