INCRA Jig User Manual
Owner’s Manual
25971
Please read before use and keep it at hand for reference.
Since its first appearance in woodworking shops around the globe many years
ago, INCRA Jig has established itself as the finest and most versatile woodworking system available. At the top of its list
of features has always been its unparalleled positioning accuracy. As a fence system, INCRA Jig’s amazing precision
allows exact fence placement to within a few thousandths of an inch, regardless of your skill level. As a joint making
machine, these same positioning capabilities permit an endless variety of box joints and all styles of dovetails to be
created. And with decorative joints like the exquisite INCRA Double Dovetail (described in the INCRA Master Reference
Guide and Template Library sold separately), INCRA Jig makes the seemingly impossible quite possible.
This owner’s manual is an ideal companion to the superb instructional DVD included with the purchase of your new
INCRA Jig. Please take an hour or so to view this enjoyable video production. You will see and hear in real life,
everything that is illustrated and written in this manual, and you will soon be on your way to unleashing the awesome
capabilities that the world famous INCRA Jig will put in your shop. As a bonus, you’ll also learn a host of useful
information about general purpose router table techniques that you can apply to all your woodworking projects.
SAFETY
x Before using the INCRA Jig, carefully read and follow
all of the instructions and safety information in this
manual.
x When using the INCRA Jig in conjunction with any
other tool, first read and follow all instructions and
safety information in that tool’s owner’s manual.
x When the INCRA Jig is mounted to a wooden base or
table surface, make sure that all four mounting screws
are securely tightened and the INCRA Jig is firmly held
in place.
x When using the INCRA Jig with a wooden base panel,
always make sure that the base is securely clamped,
screwed or otherwise fastened to the work surface
before making a cut.
x Always turn off the power and make sure that the bit or
blade is fully stationary before moving the INCRA Jig to
any new setting.
Important safety instructions for using the INCRA Jig
x Always keep both hands behind the fence when
moving the INCRA Jig to any new setting.
x Before making a cut, always make sure that the
clamping knob is fully tightened and the jig is securely
locked in place.
x When using the INCRA Jig with other tools, make sure
that all safety guards and other safety equipment
supplied by the manufacturer of that tool are securely
in place and functional. Never let the INCRA Jig
interfere with another tool’s safety equipment.
x Use appropriate safety devices. Keep hands clear of
the bit or blade. Always use a push stick, rubber soled
push block, or other safety devices to keep your hands
safely away from the cutting tool.
x Wear safety glasses, hearing protection and a dust
mask, and follow all normal shop safety practices.
RTD10000168AA
1
INCRA Jig Assembly
Step 1. Attach sawtooth positioning racks.
Begin by assembling the (4) INCRA sawtooth racks to
the (2) INCRA Jig body halves. Place a rack into one of
the receiving grooves and align the mounting holes.
Now place the 8-32 hex nuts from hardware pack D-01
into the hex recesses on the rack and loosely fasten
using the 8-32 Phillips screws with washers, Fig. 1.
Repeat for all of the remaining racks. For now, finger
tighten only. The racks should still be loose enough to
shift slightly back and forth.
Step 2. Clamp INCRA Jig body halves
together.
IMPORTANT: Before proceeding, make sure that the
racks installed in Step 1 are still a little loose .
Place the two INCRA Jig body halves together as shown
in Fig. 2 and install the carriage bolt, large washer and
2-wing clamping knob from hardware pack D-01.
IMPORTANT: The body half
with the scale should be on
the bottom. Set the top half to
a position of about 5 inches
(not critical) as indicated on the
bottom scale, then tighten the
clamping knob. Now securely
tighten all (8) Phillips screws,
Fig 2A. This procedure aligns
the racks automatically and
perfectly.
Fig. 2A Tighten racks
First: Tighten
clamping knob
Fig. 1 Install INCRA sawtooth racks
8-32 hex nut (8)
Hex nut in recess
Sawtooth rack (4)
Fig. 2
Second: Tighten all (8)
Phillips screws (4 top,
4 bottom)
Clamp halves together
Large washer
INCRA Jig body half (2)
#8 flat washer (8)
8-32 x 7/16“ Phillips screw (8)
2-wing clamping knob
Body half with scale is
on the bottom
Carriage bolt
Step 3. Attach INCRA Jig to base
panel.
To attach the INCRA Jig to your router table,
you’ll need a piece of 3/4” thick by 9” wide
plywood or MDF that’s long enough to span
the width of your router table. Remove the top
half of your INCRA Jig and center the bottom
half, scale side up on the panel. (Be sure the
carriage bolt is properly installed from
underneath as shown.) Center and square the
INCRA Jig on the panel, then attach it with the
#10 x 1” wood screws with washers included
in hardware pack D-02. Now replace the top
half of the INCRA Jig along with the washer
and clamping knob. Secure the base to your
router table with a pair of C-clamps as shown
in Fig. 3, or if your router table is “INCRAready”, with slotted holes, you can attach the
base panel with user provided T-bolts,
washers and clamping knobs, Fig. 3A. Just
drill holes in the base panel to align with your
router table slots.
Fig. 3
Attach to base panel
#10 x 1” wood screw & washer (4)
Bottom INCRA Jig body half
(with measuring scale)
Square INCRA Jig to
base panel
3/4” plywood or
MDF base panel
Carriage bolt in place before mounting
Use C-clamps to attach a 3/4” thick by
9” wide plywood or MDF base panel to
your router table . . .
2
9”
Fig. 3A
… or, if your router table is “INCRA-ready” with
built-in mounting slots, you can attach the base
panel with T- bolts, washers and knobs for
greater ease of use
User Made Accessories - Fence
Note: If you have purchased the factory INCRA Fence
System shown in Fig. 4 (recommended), use the
instructions included with that product to assemble and
attach to your INCRA Jig. Follow the instructions below
if you would prefer to make your own, Fig. 5.
Fig. 5
Fence
Stop
User made accessories
Right angle
fixture
Making and attaching your fence.
Begin by making the fence as dimensioned in Fig 6.
Use a straight piece of 3/4” MDF, hardwood or plywood.
Layout the position
for the notch, then
cut the waste away
with multiple side-byside passes at the
table saw using a
miter gauge to guide
the material, Fig. 6A.
Fig. 7
Clamp INCRA Jig to table
Fig. 4
T-slot fence
Stop positioner
Fig. 6
Factory Accessories
User made fence dimensions
5/16” diameter through hole
with 5/8” diameter by 3/8” deep
counter bore (2)
1/4-20 x 7/8 socket head cap
screw and washer (2)
INCRA
Right angle
fixture
3/4”
2 1/2”
”
4
/
3
0
1
1”
”
8
/
3
1
1
1 5/16”
”
4
2
Fig. 6A
4
/
1
1
Cut notch
3”
”
IMPORTANT:
Before attaching the
fence, the INCRA Jig
must first be securely mounted to a 3/4”
wooden base panel and the base panel must
be clamped to your router table. Also make
sure that the INCRA Jig’s clamping knob is
securely tightened, Fig. 3 & Fig. 7.
Attach the fence to your INCRA Jig front end using the
1/4-20 x 7/8” socket head fasteners with washers and
rectangular nuts from hardware pack D-02.
CAUTION: The raised rim on the two rectangular
nuts MUST FACE AWAY from the fence as shown in
Fig. 8. Now slide the rectangular nuts into the T-slots
located at the front end of the INCRA Jig’s top body half
and tighten the fasteners to secure.
After attaching your fence, check for squareness with
your router table top. If any adjustment is necessary,
loosen the mounting screws and insert a paper or plastic
shim between the INCRA Jig and the rear of the fence,
Fig. 9. A shim placed below the fasteners will increase
the angle between the fence and table; a shim placed
above the fasteners will decrease the angle. Tighten the
fasteners to secure the fence.
1/4-20 rectangular nut (2).
Raised rim MUST face AWAY
from the fence
Fig. 8
Fig. 9
Attach fence to INCRA Jig
Square Fence to router table
Place shim between top of jig and
fence to decrease angle
Place shim between bottom of jig
and fence to increase angle
3
Fence
Square
User Made Accessories - Stop
Making a Stop Positioner
Fig. 10
Stop positioner
Your stop positioner is useful for limiting the length of cuts made at the
router table. Just position the stop and secure it to the fence with a
wooden hand screw clamp, Fig 10. This is perfect for the stopped
cuts required for the dovetail pin cuts described in the joinery section of
this manual.
The simple design shown in Fig. 11 includes a rabbeted area that
allows moving the stop over the top of the cutter for very short stopped
cuts. 3/4” MDF will make a good stop material.
TIP: When making fine adjustments
Fig. 11
Stop dimensions
relative to an initial stop position, place a
mark on the front face of the fence along
the leading edge of the stop positioner,
Fig. 12. Now when you loosen the clamp
and slide the stop you can easily gauge
how much you have moved the positioner.
8”
3/4”
3”
1/2”
1/2”
User Made Accessories - Right Angle Fixture
Fig. 13
2 5/8”
Right Angle Fixture
6 1/2”
5 1/2”
6 1/2”
Material:
3/4” MDF
Faceplate
B
Base
Side (2)
Fig. 13A
”
2
/
1
5
A
5 1/2”
Right Angle Fixture cutting diagram
A
A
e
d
i
S
e
s
a
B
”
2
/
1
6
S
e
d
i
/
1
6
Fig. 12
”
2
Marking stop position
B
t
a
l
p
ce
a
F
6
”
8
/
3
6
2
C
r
e
n
n
u
R
r
e
n
n
u
R
e
”
2
/
1
e
t
s
a
W
”
2
/
1
6
6 1/2”
6 1/2”
1 3/8”
Runner (2)
Making a Right Angle Fixture
This simple Right Angle Fixture is an important
accessory for joinery. Use it to guide your material
Fig. 13B
All grooves are 3/4”
wide by 1/4” deep
and located 3/8”
from the material
edge
Groove detail
Fig. 13C
3/4”
3/8”
1/4”
for the vertical cuts required for dovetails and box
joints as shown beginning on page 7.
To make the design shown in Figs. 13 & 14, begin with (4) identical pieces of 3/4”
MDF, cut to 5 1/2” x 6 1/2”. Cut (2) pieces “A”, (1) piece “B” and (1) piece “C” as shown in
Fig 13A. To cut ALL the grooves as shown in Fig. 13B, set a 3/4” diameter router bit to 1/4”
depth of cut, and set the fence-to-bit distance at 3/8”. Check the fit of the material in the
grooves, then fine tune as necessary. Now, rip (1) piece “A” to yield (2) 2 5/8” wide Side
pieces. Then rip the final uncut blank “C” to yield the (2) 1 3/8” Runners.
To assemble, first glue the (2) Runners to the Base, allowing 3/4” of overhang as shown in
Fig. 13C. Now glue the Faceplate and the (2) Sides to the Base. Make sure that the
Faceplate is offset 1/8” from the fence Side piece as shown in Fig. 13C, and that the
Faceplate and the fence Side piece are square to your table top.
4
Top view
Base
3/4”
Fig. 14
Faceplate
1/8”
This Side bears
against fence
Runner (2)
Finished Fixture
Right angle fixture operation.
Before clamping a workpiece to your Right Angle Fixture,
always press the fixture against your fence, then
immobilize by clamping it to the table with a spring clamp,
Fig. 15. When positioning the workpiece against the
faceplate, make sure that the edges of the boards are
against the fence and the ends are contacting the table
surface, then clamp in place using a wooden handscrew
clamp.
CAUTION: Do not allow any part of your
hands to hang below the body of the Right
Angle Fixture. Always keep hands well away
from the bit.
Fig. 15
Right angle fixture operation
Avoid contacting wooden
runners with router bit
Third: Position stock against fence and
clamp with a wooden jaw clamp
Second: Immobilize with spring
clamp (acts like a “third hand”)
First: Push Right Angle
Fixture against the fence
TIP: To avoid contacting the wooden runners with the
router bit, clamp your stop to the outfeed end of the fence
to stop the forward travel before contact.
Basic Operation and Calibration
Note: All subsequent illustrations
reflect use of the factory accessories.
Basic INCRA Jig operation
To move your INCRA Jig’s fence from one scale setting to
another, loosen the clamping knob two full turns and lift the
rear of the INCRA Jig’s upper body. This disengages the
saw-toothed racks and allows you to slide the Jig forward.
Slide to align the rear of the upper body over the desired
mark on the scale, then lower the upper body to re-engage
the racks. You should be able to shift the upper body from
side to side easily when the racks are engaged properly.
Tighten the clamping knob, Fig 16.
TIP: A wooden jaw clamp works BEST! One-handed
clamps typically don’t have enough holding power, and a
C-clamp can mar your work, and can be difficult to handle.
Fig. 16
Second: Lift back
end of upper body
Basic operation
First: Loosen clamping
knob 2 full turns
Fourth: Lower body then
tighten clamping knob
Third: Slide upper body to desired
alignment over scales
INCRA Jig calibration
Initially, the alignment between the scale and body may
appear slightly off, but the one-time-only adjustment is
easy. Loosen the four Phillips head screws that secure the
upper racks, then loosen the clamping knob about one-half
turn. Now shift the upper body slightly forward or
backward until the rear of the upper body aligns clearly
over any scale mark. Tighten the clamping knob, then
secure the racks by re-tightening all four Phillips head
screws, Fig. 17. From now on, the scale will align perfectly
at all INCRA Jig settings.
Fig. 17
First: Loosen all (4)
5
Calibration
Phillips screws
Second: Loosen clamping
knob 1/2 turn
Third: Shift upper body until desired
alignment over scales is achieved
Fourth: Tighten
clamping knob
Fifth: Tighten all (4)
Phillips screws
Loading...