Frame Mortise & Tenon Jig User Guide
38
Chapter 5
MULTIPLE JOINTS
5-40 Rout the left pair of tenons in the same way as for the qua-
druple tenons
➀
(see 5-30 and 5-31), using the Limit Stops
➁
and an L-shaped guard
➂
in the guard recess to prevent accidental
routing of adjacent tenons.
m Do not attempt routing the third tenon before reading on.
2
2
1
3
5-41 m If the tenon rail is thicker than 1
5
⁄16"[34mm] (as is
most likely with this type), then great care must be exercised not
to “trap” the bit
➀
when routing the third tenon.
i.e. The bit would have to be plunged into the side of the tenon
board. This could result in the bit “driving” itself across the board
which could be dangerous.
1
5-42 So to reduce the thickness, move the table right and rearward
against the stops
➀
as if to rout a quadruple tenon. Then add a
small “guard” piece
➁
to the L-shaped guard in the guide recess.
Now rout away part of the workpiece
➂
.
1
1
3
2
5-43 Move the table forward, keeping it to the right
➀
. Flip the
guards to the back
➁
. Now rout away the front-right part of the
workpiece
➂
.
1
1
3
2
5-38 Release the table clamp and sight the rear tenon of the
pair
➀
, making sure that the right-hand
stop is against its
post
➁
.
Lock the table.
Move the front
limit stop to its post and lock
➂
.
2
3
1
1
5-39 Release the table clamp and move the table to sight the third
(single) tenon
➀
. Lock the table.
Set and lock the left-hand
limit stop to its post
➁
. Cut a small
hardwood block to the following size:
Width
➂
1
⁄2"[13mm], Depth
➃
5
⁄16"[8mm], Length
➄
: Cut to length
to a snug fit between the rear
limit stop and its stop post. This
block will be used for the “third” tenon position.
2
3
1
1
3
4
5
5
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