American Woodworker
Contact Us | Help | Report a Bug
Sign in | Join
 

Wedged Mortise & Tenon Portales NM

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.

Portales Ace Hardware
(575) 356-6711
227 S Main Ave
Portales, NM
 
LOWE'S OF CLOVIS, NM
505 742-4000
3601 NORTH PRINCE STREET CLOVIS, NM, 88101
Clovis, NM
 
Lowe's
(575) 742-4000
3601 North Prince Street
Clovis, NM
Hours
M-SA 7 am - 9 pm
SU 9 am - 8 pm

Triangle Ace Hardware
(575) 762-3301
2400 N Prince St, North plains mall
Clovis, NM
 
North Plains Mall
(575) 769-4700
2811 N Prince St
Clovis, NM
Store Hours
Sears Stores
Store Type
Sears Stores
Hours
Mon:10-21
Tue:10-21
Wed:10-21
Thu:10-21
Fri:10-21
Sat:10-21
Sun:12-18
Store Features
Mon:10-21
Tue:10-21
Wed:10-21
Thu:10-21
Fri:10-21
Sat:10-21
Sun:12-18

Burns Hardware Do it center
(575) 769-2528
1511 N Prince St
Clovis, NM
 
Fastenal- Clovis
505-763-9335
1306 State Rd. 209 Clovis, NM, 88101
Clovis, NM
 
PGP, Inc.
505-762-6654
1729 W. 21st Clovis, NM, 88101
Clovis, NM
 
Furrow's Home Lumber Inc.
(575) 763-4437
1201 E 1st Street
Clovis, NM
 
Hacienda Home Centers
(575) 769-2651
200 East Brady Avenue
Clovis, NM
 

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.

Click here to read the rest of the article from American Woodworker