INCRA Build-It STS Mortiser User Manual
INCRA Build-It
Ta yl o r D e s i g n G ro u p, I nc .
STS M
Manual
w w w . i n c r a . c o m
INC RA B uil d- It STS Mort iser M an ual
Loose Tenon Joinery
Mortise and tenon joinery as shown in Fig. 1 produces
some of the strongest connections between two pieces of
wood but the setups can be tedious. The mortises are difcult
to place accurately at the router table and the tenons, while
easy enough with the right jig, still require two sets of cuts
to produce. First the shoulders are cut using a miter gauge
followed by the cheeks, which are cut using a tenoning jig. And
all of this to produce what amounts to a square peg for a
round hole. The tenons need to be rounded or the mortises
squared for the nal assembly. We probably don’t need to
mention the additional challenge of making cuts at the table
saw that t well into cuts made at the router table.
Loose tenon joinery on the other hand provides all of the
strength benets without the tedious setups. In loose tenon
joinery all of the pieces to be joined receive an identical
mortise, while the tenon itself is simply a short cutoff from
a long piece of stock, thickness planed, ripped and rounded
over to t the mortise, Fig. 2. And, while locating the
mortises at a router table is still a problem using conventional
methods, you’ll nd perfectly located slots easy with this
new slot-mortising jig, Fig. 3. This jig takes advantage of
the ease of vertical router adjustment provided by the wave
Mortise and Tenon Joinery
Fig. 1
cheeks
mortise
shoulders
Fig. 3
of router lifts on the market today. If you own a router lift
and a router table with a miter slot, you’ll love the versatility
and ease of use of this great jig. Just clamp your material in
place and slide the jig back and forth between two stops as
you slowly raise the cutter using the lift’s crank handle. If
you do not already own these two pieces of equipment, read
on, since the acquisition of these tools is, in many cases,
considerably less than the cost of slot mor tising tools
currently available on the market.
STS Mortiser
Loose Tenon Joinery
Fig. 2
slot mortise
loose tenons
Page 1
INC RA B uil d- It STS Mort iser M an ual
Making the STS (Slot-Tenon-Slot) Mortiser
Build-It Platform
Materials List:
1. In typical router table cutting operations,
router lifts are installed in the table with the
crank handle located so that it is between the
To assemble the STS Mortiser you’ll need:
(2) Small Build-It Panel
router bit and your router table’s miter slot.
In order to use your new STS Mortiser, you’ll
need to rotate the router lift in your table
(2) T-Slot Panel Connector
(1) 18” Miter Slider
opening so that the router bit is between the
miter slot and the crank handle, Fig. 4.
CAUTION:
ALWAYS RETURN THE LIFT TO THE ORIGINAL
SETUP AFTER USING THE STS MORTISER.
(1) Pair Build-It Brackets
(1) Pkg. Build-It Knobs
(1) Build-It Clamp
2. Attach the Miter Slider and (2) T-Slot Panel Connectors
to one of the Build-It Panels and place in your router table’s
miter slot as shown in, Fig. 5.
Router Table Conguration
Fig. 4
(2) 18” Incra T-Track Plus
(1) 18” Incra T-Track Regular
(1) 3/4” x 10” x 10” plywood
(1) 3/4” x 2-1/4” x 28” hardwood
(1) 1” x 4” x 18” hardwood
(1) 1-1/4” x 1-3/4” x 18” hardwood
Adjust the Miter Slider for a smooth glide in the miter slot.
Cut the remaining Build-It Panel at your table saw to fill
the gap between the panel connector and your router lift’s
crank handle. Attach the panel.
miter slot
crank handle
Install router lift with
cutter between crank handle
and miter slot
Miter Slider
crank handle
Cut Build-It Panel to t
between Panel Connector and crank handle
Panel Connector
Build-It Platform
Fig. 5
Page 2
INC RA B uil d- It STS Mort iser M an ual
Fence and Stop Positioner
3. Prepare a straight, at piece of hardwood to the dimensions
shown in Fig. 6 and Detail 6A. Cut the groove shown and
install the T-Track and T-Track Plus. Build the stop positioner
as shown in Fig. 8 using 3/4” hardwood.
T-Track Fence
Fig. 6
18” T-Track Plus
18” T-Track
Regular
4. Attach the stop positioner to the fence using 1/4-20 x 1-1/2”
hex bolts with washers and clamping knobs, then attach the
fence to the Build-It Platform using (2) Build-It Brackets with
the included 1/4-20 x 1” hex bolts, washers and clamping knobs.
Square the fence to the “cut” edge of the Built-It Platform
and tighten the clamping knobs, Fig. 9.
Fence and Stop Positioner
Fig.7
Stop Positioner
Fig.8
3
/4”
11/8”
2”
21/16”
Add Fence and Stop to Build-It Platform
Fig.9
clamping knobs
1
/4”- 20 x 11/2”
hex bolts
18”
square fence to
this edge of platform
Detail 6A
3
/4” wide x 1/2” deep
groove
13/4”
11/4”
5
/8”
5
”
23/16”
1
/2”
3
/16
dia holes
Right Angle Faceplate Assembly
5. Starting with a 10” x 10” piece of 3/4” plywood, cut 5/16”
wide x 8” long slots through the material as shown in Fig. 11.
On a 4” x 18” piece of
1” thick hardwood, cut
Fig.10
Right Angle
Faceplate Assembly
the groove as shown
and inlay an 18” T-Track
Plus.
Fasten with the #8 x
1
/2” pan head Phillips
screws.
Page 3
Fig.11
1”
Faceplate and Base
10”
5
21/2”
/
1”
” wide
16
slots
21/2”
4”
1”
1
/4”-20 x 1”
hex bolts (4)
10”
18”
1
/4”
11/4” wide x 1/2” deep groove
18” T-Track Plus
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