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The best way to make three-way mitre joints is to use a mitre saw and a Domino joiner. If you have tried the joint with a tablesaw and a shop-made routing jig, you know how slow and unreliable the method is.

You can cut the double mitres first, the Domino joiner will cut a mortise perpendicular to the mitre. The three pieces are assembled all at once.

Another approach is to cut the mortises first and then mitre the ends. Under this approach, the mortises are parallel to the stock. That means you can join any two pieces first and then add the third piece, making the assembly process easier.

The final clean-up is best done with a handplane:

Gallery

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I forgot to include a close-up shot of the joint and here it's:


Tip 1: Do as many dry-fittings as you reasonably can before the actual glue-up. It'll be more than nerve-wrecking to many and dry clamping is the only cure I know of (unless you have as many arms-6-as an octopus does).

Tip 2: Use hide glue (Old Brown glue is my favorite - http://tinyurl.com/pq3d4rf) as it has a long open time and just in case (it shouldn't happen if you follow Tip #1) you need to start over again, you can undo the problematic joint(s) with moisture and heat.
 

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An interesting joint done well!
 

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Interesting joint - makes you try to do it
 

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Very interesting. Makes for an attractive looking joint. How about duration of strength?
 

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it must be real fun getting it square and the legs at 90 degrees to the top.
 

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I forgot to include a close-up shot of the joint and here it s:


Tip 1: Do as many dry-fittings as you reasonably can before the actual glue-up. It ll be more than nerve-wrecking to many and dry clamping is the only cure I know of (unless you have as many arms-6-as an octopus does).

Tip 2: Use hide glue (Old Brown glue is my favorite - http://tinyurl.com/pq3d4rf) as it has a long open time and just in case (it shouldn t happen if you follow Tip #1) you need to start over again, you can undo the problematic joint(s) with moisture and heat.

- ChuckM
Don't octopi have 8 arms?
 

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Now that's one nice looking $1300.00 joint!!!!!!!!
 

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Crank49 -

According to a few scientific studies, an octopus actually has 6 arms and 2 limbs.
 

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Crank49 -

According to a few scientific studies, an octopus actually has 6 arms and 2 limbs.

- ChuckM
Wow,
Do we need to change the name to Sextopus, or maybe Bisextopus?
Wouldn't want the little critters getting offended. ;^)
 

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Thanks for all the questions and comments.
 

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Hello ChuckM

I enjoy a good joint and this one OK looks, good enough to try, so a question I know you showed two assembly methods but how do you maintain the correct angles if everything is glued up together?
 

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Hi Robert,

I clamped the frame and let it cure before attaching the legs. I hope the above photos help.

Chuck
 

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Thanks for the insight on that joint Chuck, your method is really way easier than the dowels I used in the past. I might end up investing in a domino joiner after all!
 

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Hello Thomas,

The DJ (mine is DF500) is worth every cent of it for cabinet, table, chair, bookshelf and joinery projects. You will see immediate increase in your productivity once you learn how to use it. I have yet to come across or know someone who is unhappy with their investment in a DJ.
 
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