LumberJocks

Three-way mitre joint made (a little) easier

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Project by ChuckM posted 08-29-2015 01:34 PM 6478 views 7 times favorited 15 comments Add to Favorites Watch

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:

-- The time I enjoy wasting is not time wasted





15 comments so far

View ChuckM's profile

ChuckM

593 posts in 3421 days


#1 posted 08-29-2015 02:05 PM

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.

-- The time I enjoy wasting is not time wasted

View Mark Shymanski's profile

Mark Shymanski

5621 posts in 3467 days


#2 posted 08-29-2015 02:06 PM

An interesting joint done well!

-- "Checking for square? What madness is this! The cabinet is square because I will it to be so!" Jeremy Greiner LJ Topic#20953 2011 Feb 2

View majuvla's profile

majuvla

10704 posts in 2622 days


#3 posted 08-30-2015 05:58 AM

Interesting joint – makes you try to do it

-- Ivan, Croatia, Wooddicted

View DonB's profile

DonB

509 posts in 2447 days


#4 posted 08-30-2015 11:13 AM

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

-- DonB

View vonhagen's profile

vonhagen

533 posts in 2119 days


#5 posted 08-30-2015 12:31 PM

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

-- no matter what size job big or small do a job right or don't do it at all.

View helluvawreck's profile

helluvawreck

27784 posts in 2621 days


#6 posted 08-30-2015 12:36 PM

It’s a very nice and interesting piece of work. Congratulations.

helluvawreck aka Charles
http://woodworkingexpo.wordpress.com

-- If a man does not keep pace with his companions, perhaps it is because he hears a different drummer. Let him step to the music which he hears, however measured or far away. Henry David Thoreau

View crank49's profile

crank49

4016 posts in 2726 days


#7 posted 08-31-2015 03:40 AM



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?

View ohwoodeye's profile

ohwoodeye

1872 posts in 2908 days


#8 posted 09-01-2015 04:02 PM

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

-- Directions are just the Manufacturer's opinion on how something should be assembled. ----Mike, Waukesha, WI

View ChuckM's profile

ChuckM

593 posts in 3421 days


#9 posted 09-02-2015 02:25 PM

Crank49 -

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

-- The time I enjoy wasting is not time wasted

View crank49's profile

crank49

4016 posts in 2726 days


#10 posted 09-02-2015 03:57 PM



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. ;^)

View ChuckM's profile

ChuckM

593 posts in 3421 days


#11 posted 09-03-2015 03:46 PM

Thanks for all the questions and comments.

-- The time I enjoy wasting is not time wasted

View robscastle's profile (online now)

robscastle

4214 posts in 1959 days


#12 posted 10-20-2016 03:37 AM

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?

-- Regards Robert

View ChuckM's profile

ChuckM

593 posts in 3421 days


#13 posted 10-25-2016 01:22 AM

Hi Robert,

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

Chuck

-- The time I enjoy wasting is not time wasted

View Sodabowski's profile

Sodabowski

2350 posts in 2588 days


#14 posted 09-05-2017 09:38 PM

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!

-- Thomas - Pondering the inclusion of woodworking into physics and chemistry classes...

View ChuckM's profile

ChuckM

593 posts in 3421 days


#15 posted 09-06-2017 04:23 PM

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.

-- The time I enjoy wasting is not time wasted

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