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4. Setting the Joint Length
The M&T jig has two working sections, the mortise section and the tenon section (Fig. 16).
Fig. 16
Both the mortise section and the tenon section of the jig are equipped with left and right
Adjustable Sliding Templates [#2 & #3] (Fig.16) that are used to set the length of the joint. Visible
are the numbers 1, 2 and 3 along with associated ruled markings on each template's edge [2B].
To adjust the templates for the desired joint length, loosen the Lock Screws [2C] on the right
and left templates on both sides of each joint and slide them to the desired opening indication (as
referred to in the chart based on your bit diameter). All four (4) sliding templates should be at the
same setting. Re-tighten the screws.
The numbers 1, 2 and 3 on the adjustable sliding templates directly correlate to the 3/8" bit
reference in the chart that follows. For example, if you set the template positions to #2 you will
create a 2" long joint. Set the templates to #1 and you'll create a 1" long joint.
If you're using a 1/4" or 1/2" diameter bit, refer to the settings in the chart for the actual size of the
joint at these same markings. The chart compensates for the difference in bushing size and bit
diameter from a 3/8" bit. For example, using a 1/4" bit with the templates positioned at #2 would
produce a joint that is 1-7/8" long. Similarly, using a 1/2" bit with the templates at the #2 position
would produce a 2-1/8" long joint.
Notes:
1. The chart below indicates the exact length of each joint for each marking on the
template and for each bit size.
2. When you set the size of the opening, make sure that ALL of the templates indicate
the same measurement; this assures that both the mortise and the tenon will be the
same size. (Fig. 16)
Joint
Thickness
3
1/4"
2-7/8
3/8"
3
1/2"
3-1/8
MORTISE SECTION
Length of Mortise and Tenon Chart
Template Position Markings
2-3/4
2-1/2
2-1/4
2-5/8
2-3/8
2-1/8
2-3/4
2-1/2
2-1/4
2-7/8
2-5/8
2-3/8
TENON SECTION
2
1-3/4
1-1/2
1-7/8
1-5/8
1-3/8
2
1-3/4
1-1/2
2-1/8
1-7/8
1-5/8
1-1/4
1
1-1/8
7/8
1-1/4
1
1-3/8
1-1/8
9
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