What is this joint called and how would you make it?

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Forum topic by ssbothwell posted 04-04-2014 08:52 PM 8265 views 2 times favorited 9 replies Add to Favorites Watch
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13 posts in 3118 days

04-04-2014 08:52 PM

This joint is really common in stretcher bars for canvas paintings. I’m having trouble working out how to the joint is made. I guess its a variation on a bridle joint.

its not clear in this photo but one of the faces is cut to a slight bevel (usually between 6 and 12 degrees).

9 replies so far

View JayT's profile


5679 posts in 2238 days

#1 posted 04-04-2014 08:56 PM

I believe it is a mitered bridle joint.

Edit: I stand corrected. Here it is shown as a mitered double bridle joint.

-- In matters of style, swim with the current; in matters of principle, stand like a rock. Thomas Jefferson

View dbhost's profile


5726 posts in 3259 days

#2 posted 04-04-2014 08:57 PM

I am pretty sure that joint is called a “Folded Miter Joint”. And while I have never made (or personally seen one up close and persona), I do believe either Shopnotes, or Wood Magazine a while back had a HOWTO article on those… Looks like a very strong, but somewhat difficult to make joint…

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View bandit571's profile


20247 posts in 2710 days

#3 posted 04-04-2014 09:00 PM

Think more along the lines of a mitered half lap joint. Then cut out about half of each lap. Cut the slot for the lap to go into the corner. Lay out the miter first, but only a quarter of the way down. Each lap is also a quarter of the thickness. Miter=1/4, lap=1/4,slot= 1/4, and the other miter = 1/4 of the board’s thickness. be sure to mark where each part goes, THEN cut with a saw.

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13608 posts in 3368 days

#4 posted 04-04-2014 09:18 PM

after the joint itself is done
then do the face bevel
as you will need the parts to be square
for the joint themselves

-- david - only thru kindness can this world be whole . If we don't succeed we run the risk of failure. Dan Quayle

View steve_in_ohio's profile


1195 posts in 1637 days

#5 posted 04-04-2014 09:21 PM

here is something very similar that shows you how to make it

-- steve, simple and effective

View bigblockyeti's profile


5140 posts in 1747 days

#6 posted 04-04-2014 09:54 PM

I agree with the first post of it being a mitered double bridle joint. I would make it using a tenoning jig on the tablesaw.

View Grumpymike's profile


2263 posts in 2342 days

#7 posted 04-04-2014 10:01 PM

I’ve heard it called as Jay T says a “Mitered Bridle joint”, and as someone said a “Double Miter Bridal”.

A half lap would be one piece cut half way through on a 45 and the other piece the reciprocal.

A bridal joint is one piece with two sides (think open ended mortise) and the other is like a tenon, and slides into the mortise.

So, with all that being said, It’s a “Mitered Double Bridal Joint” That’s my story and I’m sticking to it …

-- Grumpy old guy, and lookin' good Doin' it. ... Surprise Az.

View ssbothwell's profile


13 posts in 3118 days

#8 posted 04-04-2014 10:04 PM

whoa, thanks for all the information! this just about covers it. i’ll have to play around with my tenon jig and see if i can figure it out.

these joints get mass produced on an industrial scale for all the stretcher bars sold at every art store in the world so there must be a pretty simple way of cutting it.

View Grumpymike's profile


2263 posts in 2342 days

#9 posted 04-05-2014 05:01 PM

Called an old high school chum that worked in a frame factory till he retired. He says that they made the Double Bridle miters on a ‘shaper’ with multiple sets of heads … (As you know a shaper is like a giant router).

I would really like to see how you do on this scary looking joint … in the mean time I will be playing in my shop to see what I can do.

-- Grumpy old guy, and lookin' good Doin' it. ... Surprise Az.

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