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Double Mortise & Tenon Joints

The Mortise and Tenon joint is prime to good woodworking. There are many variations of the mortise and tenon together with what I’m going to point out you at present: the double mortise and tenon joint. The idea is straightforward. As an alternative of getting one big mortise and tenon joint, we cut up it into two.

Is It Stronger?

Perhaps. For thicker workpieces similar to eight/four inventory, I personally consider a double tenon may be stronger than a single large tenon. My logic comes from the truth that the double tenon sports activities twice as a lot floor space as the only tenon. And extra floor space sometimes equates to elevated power. Admittedly, I haven’t executed the testing myself so I’ve no numbers to again up my opinion. If anybody can advocate a joint power check that we will reference, please be happy to say it within the feedback under.

Begin With the Mortise

routing-double-mortisesIdentical to a daily mortise and tenon joint, I like to start out with the mortise. I exploit a router with an edge information and a three/eight″ router bit to do the work. By making a move on all sides of the board, I can produce completely symmetrical twin mortises, every the very same distance from the sting of the workpiece.

Utilizing a bit of scrap, I make a pattern mortise that begins off identical to the others. However to assist us with our tenon setup, I’ll take away the center piece of inventory between the mortises to supply one full width mortise. That is what we’ll use to setup for the outer cheek tenon cuts.

The Tenons

Laying out outer cheeks

Utilizing the massive mortise, I make marks on the top of the tenon board that symbolize the place we have to cut the outer cheeks. It’s additionally a very good ides to make use of a chopping gauge to determine the shoulder. On the desk noticed, I exploit a miter gauge and the rip fence to cut the three/eight″ shoulder on all 4 sides of the workpiece.


Subsequent, utilizing a Tenon Jig, I increase the blade and cut the cheeks. It’s a good suggestion to deliberately make the tenon just a bit fats. Verify the tenon towards the massive mortise and regulate the jig as needed, sneaking up on the right slip match. As soon as the vast cheeks are established, cut the brief cheeks as well utilizing the identical setting on the desk noticed.

Laying out center cheeks

With the tenon resting on one of many true double mortises, mark the situation of the middle mortise wall. Relaxation the tenon jig as wanted to take away inventory from the center producing two equal-sized tenons. That is one other case the place you’ll need to be cautious and sneak up on the match. In all probability, you’ll have to perform a little chisel cleanup after the operation if you’d like the shoulders of your tenon to satisfy up completely with the mortise board. Whereas the preliminary setup takes a couple of minutes, you’ll be able to batch out a bunch of those joints very quickly flat!

Stuff to Assume About

Think about using a sq.-tooth blade. Some rip blades function a sq. tooth that leads to a pleasant sq. cut. Box joint blades and blades with a deliberate sq. tooth grind are additionally good decisions. Right here’s the one I exploit. If it’s a must to use a blade with alternating bevels, it isn’t the top of the world although. You’ll simply have just a little extra cleanup to do with the chisels.

Though I didn’t present it within the video, you’ll must be involved concerning the sq. tenon/spherical mortise difficulty. To get the right match, you’ll both have to sq. up your mortises or spherical over your tenons. I want to spherical over the tenons because it’s usually quicker and it permits me to simply finesse how a lot slack I’ve in my joint.

If a tenon jig is slightly wealthy in your blood contemplate making your personal:

Store-Made Tenon Jig – Woodsmith

Table Saw Tenon Jig – Well-liked Woodworking

Easy methods to Make a Tenon Jig (VIDEO) – Austin DenHerder

This post first appeared on Woodworking Made Easy - Tips, Projects, Plans And Video, please read the originial post: here

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Double Mortise & Tenon Joints


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