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Wedged Mortise & Tenon De Soto MO

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 Home Depot
(636)937-9601
1131 W Gannon
Festus, MO
Hours
Mon-Sat: 6:00am-10:00pm
Sun: 8:00am-8:00pm

Dep Builders Supply/dep Heating & Cooling
(636) 337-3381
12561 Hwy 21
De Soto, MO
 
LOWE'S OF FESTUS, MO
636 933-3320
1111 BRADLEY STREET FESTUS, MO, 63028
Festus, MO
 
Lowe's
(636) 933-3320
1111 Bradley Street
Festus, MO
Hours
M-SA 6 am - 10 pm
SU 8 am - 8 pm

Crystal City - Dlr In Kmart
(636) 933-7011
155 Twin City Mall
Crystal City, MO
Store Hours
Hometown Dealers
Store Type
Hometown Dealers
Hours
Mon:8-22
Tue:8-22
Wed:8-22
Thu:8-22
Fri:8-22
Sat:8-22
Sun:8-22
Store Features
Mon:8-22
Tue:8-22
Wed:8-22
Thu:8-22
Fri:8-22
Sat:8-22
Sun:8-22

Hamel & Rowe Inc
(636) 586-3230
210 N Main St
De Soto, MO
 
Hopson Lumber Company
(636) 586-3311
918 South Main Street
De Soto, MO
 
Festus Do it center
(636) 937-9663
1198 Shapiro Dr
Festus, MO
 
Holekamp Do it center
(573) 358-3371
317 N Division
Bonne Terre, MO
 
Boyer Do it Best Lumber
(573) 438-5461
208 West High Street
Potosi, MO
 

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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