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FMT Pro
How-to videos and more
Mortise & Tenon Joints:
How to Rout Quadruple and
Triple Mortise & Tenon Joints
on the Leigh FMT Pro
Leigh FMT Pro — Quadruple Mortise & Tenon Joints
The FMT Pro makes easy work of quadruple and triple mortise & tenon joints, with just a few extra steps than double joints. These strong joints are well suited to large projects like workbenches, garden benches, bed frames, tables, cabinets and large chests. Here's how easy it is to rout a quadruple joint:
The Tenons
1.
Choose the guide and bit, and install the bit in your router, as you would for single or double joints. Mark the four tenon centers and mortise position to suit your layout.
2.
With your tenon workpiece clamped in place, sight each tenon center, setting the limit stops against the limit posts as instructed in the user guide. This sets up the table for easy and accurate positioning, as you rout each successive workpiece.
3.
Place the router/sub-base on the table in position, ready to rout around the joint guide.

Note: Duplicate tenons can be routed without having to mark or sight the tenons.
4.
Rout all four tenons in their respective table positions. The preset limit stops accurately position the table for each tenon.
1. Rout the rear left tenon.
2. Move table to right. Rout rear right tenon.
3. Move table forward. Rout front right tenon.
4. Move table to left. Rout front left tenon.
The Mortises
Follow the same steps as for single and double mortises. Rout the mortises in their preset respective table positions.

Note: See Outrigger Beams for marking an outrigger for successive mortises or for setting a stop-block for duplicate mortise boards.
You're now ready to join the routed mortises and tenons together.
Triple Joints Are Just as Easy
Triple joints are routed in the same manner as doubles and quadruples. They are well suited to furniture that requires strength, and conducive to wood shaping.
A shop-made block is used to center the single tenon.
The mortises are routed in the same way as the tenons. Wood shaping is done after joints are routed.
Headboard for a bed, or back rail for garden bench.
Hand rail for a sun deck or indoor landing.
For more detailed instructions, see the User Guides and Bulletins on the Support page.
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