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Wedged Mortise & Tenon Kenosha WI

Experiment with the notch's angle. The wider the taper, the stronger the joint. My taper is 3 degrees, but you can increase it up to 8 degrees. 4. Test the bend. My flexible strips are only 1/8 in. thick opposite the strain-relief hole, so they bend easily.

The Russell Mill
(847) 395-5190
15780 W Russell Rd
Zion, IL

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The Home Depot
(847)599-0180
6625 Grand Ave
Gurnee, IL
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Mon-Sat: 6:00am-10:00pm
Sun: 8:00am-8:00pm

Kettle Moraine Hardwoods
(262) 835-9212
195 S 27th Street
Caledonia, WI

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Pershing Plz S/C
(262) 697-3300
7630 Pershing Blvd
Kenosha, WI
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Tue:10-21
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DG Hardware Kenosha
(262) 942-7596
4523 75th St
Kenosha, WI
 
The Home Depot
(262)633-0643
2429 S Green Bay Road
Racine, WI
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Mon-Sat: 6:00am-9:00pm
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The Home Depot
(847)625-1020
2001 Belvedere Rd
Waukegan, IL
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Mon-Sat: 6:00am-10:00pm
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Parkside True Value
(262) 551-8866
1735 22nd Ave
Kenosha, WI
 
Lowe's
(262) 653-8770
6500 Green Bay Road
Kenosha, WI
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Prairie Side True Value Hardware
(262) 577-3340
3755 80th Street
Kenosha, WI
 
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Wedged Mortise & Tenon

Wedged Mortise & Tenon

The joint will never loosen!

by Tom Caspar

Tap, tap, tap. The wedges go home, the glue squeezes out and a big smile lights up your face. “This joint isn’t coming apart for a hundred years,” you say. “It’s as solid as a rock!”

Making a wedged mortise-and-tenon joint is richly rewarding. Once you understand how it works (see photo, below), you can’t help but admire the joint’s elegant simplicity. It also sends a message. A wedged joint says to one and all, “This was made by a skilled woodworker.” 

How the Joint Works

Here’s a cutaway view of a wedged mortise-and-tenon joint. Driving in the wedges forces the tenon to flare into a fan or dovetail shape. The mortise is tapered to match the angle of each wedge. Like a dovetail, this joint can’t pull apart after the wedges go home.

This tenon has two unusual features: saw kerfs that create flexible strips and holes that disperse the strain that the wedges create. The wedges cause the strips to bend; the holes prevent the bend from splitting the rail.

Where could you use a wedged joint? It’s a candidate for any joint that receives a lot of stress. A table base is a good example (top photo). Pushing or leaning on this table might slowly force a standard joint apart, but wedges keep this joint locked together. 

The wedged mortise-and-tenon joint isn’t difficult to make, but you should have some experience making standard mortise-and-tenon joints before tackling it.

Tools Required

To make this joint, you’ll need a tablesaw, drill press, plunge router, chisel and a bandsaw. If your mortise’s width is 5/8 in. or more, like the mortise I made, you’ll need a 1/2-in.-dia. top-bearing flush-trim bit ($19). If the mortise is more than 3/4 in. deep, you’ll need a bottom-bearing flush-trim bit ($20) (see Source, below). For a mortise less than 5/8 in. wide, you’ll need a straight router bit and a fence or jig for your plunge router.

Rout the Mortise

Before you begin your project, make a prototype joint (see photo, below). 

Designing Your Wedged Joint

Each part of a wedged joint must often be tailored to fit the joint’s size, intended strength and type of wood. Make a prototype following these steps: 

1. Substitute a notch made with a dado set for the mortise (see “How the Joint Works,” page 45). Taper both of the notch’s sides by angling the miter gauge.

2. Make a full-size tenon. Observe how well the flexible strips bend. You may be able to use smaller strain-relief holes or no holes at all.

3. Experiment with the notch’s angle. The wider the taper, the stronger the joint. My taper is 3 degrees, but you can increase it up to 8 degrees. 

4. Test the bend. My flexible strips are only 1/8 in. thick opposite the strain-relief hole, so they bend easily.

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