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What kind of Joint and How?

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Forum topic by Freemotion posted 08-16-2018 12:44 AM 653 views 0 times favorited 11 replies Add to Favorites Watch
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Freemotion

4 posts in 34 days


08-16-2018 12:44 AM

Topic tags/keywords: joints joinery japanese joinery lap lap joint joint

Hi Everyone,

I’m trying to figure out what kind of joint this is?

Lap joint? Japanese joinery (is there a name for it?)

How would I go about making it?

Many, many thanks.

P.S. I’ve been googling for a while and just could not get the results, so I’m asking the pros here :-)


11 replies so far

View Rayne's profile

Rayne

1025 posts in 1654 days


#1 posted 08-16-2018 01:10 AM

Looks like a 3 member half-lap joint. Found this on Bing, but it was also mentioned in another post here.
http://lumberjocks.com/topics/149674

View jbay's profile

jbay

2580 posts in 1014 days


#2 posted 08-16-2018 03:40 AM

Simply just 3 birdsmouth cuts. Same cut in each piece.
Dado blade set at 30 degree angle should do it.

Depending on the size of your wood,
you might have to make a couple of passes with the dado blade, adjusting the height for each pass.
The depth of the cut, and the distance from the edge, should be the same.

View Aj2's profile

Aj2

1647 posts in 1912 days


#3 posted 08-16-2018 04:20 AM

What is that particular joint used for. I can’t think of any use.
Jbays tip make sense to me.

-- Aj

View Freemotion's profile

Freemotion

4 posts in 34 days


#4 posted 08-16-2018 04:33 AM



Simply just 3 birdsmouth cuts. Same cut in each piece.
Dado blade set at 30 degree angle should do it.

Depending on the size of your wood,
you might have to make a couple of passes with the dado blade, adjusting the height for each pass.
The depth of the cut, and the distance from the edge, should be the same.

- jbay

Hey that’s awesome jbay! That’s pretty much exactly it!

I was wondering if there was any bottom lap component, or if it would be possible,
but your diagram reveals it all.

When you say dado blade at 30 degrees it made me understand that I could just
run it through the table saw, instead of a band saw, thanks! :-)

Aj2-

Here is where I saw the joint:

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Aj2

1647 posts in 1912 days


#5 posted 08-16-2018 05:45 AM

Oh I see a modern style coat rack. Very cleaver.

Now that’s behind us let’s start working on this one. :)

-- Aj

View robscastle's profile

robscastle

5244 posts in 2319 days


#6 posted 08-16-2018 09:05 AM

View Freemotion's profile

Freemotion

4 posts in 34 days


#7 posted 08-16-2018 08:34 PM



http://lumberjocks.com/robscastle/blog/115586

- robscastle

Rob,

That’s amazing, thank you. Definitely, gives me some great starting points!

View Breeze73's profile

Breeze73

94 posts in 796 days


#8 posted 08-17-2018 03:41 AM

While it looks pretty neat, I believe that is all it could be used for… looks. It’s nothing more than end-grain glued to long grain, like a simple butt joint. It looks pretty weak and would likely fail fairly easily.

-- Breeze

View AlaskaGuy's profile

AlaskaGuy

4353 posts in 2424 days


#9 posted 08-17-2018 04:09 AM


While it looks pretty neat, I believe that is all it could be used for… looks. It s nothing more than end-grain glued to long grain, like a simple butt joint. It looks pretty weak and would likely fail fairly easily.

- Breeze73

Looks like a strength test for Matthias Wandel. A simple butt joint can be pretty strong depending on the direction the load comes from.

-- Alaskan's for Global warming!

View Lazyman's profile (online now)

Lazyman

2383 posts in 1502 days


#10 posted 08-17-2018 04:13 AM

Here is a more complex way to make a similar joint with half laps that is probably stronger because it’s not just endgrain glue joints. I think I’ve seen this used for stretchers on a 3 legged stool somewhere on LJ but cannot seem to find it now.

http://lumberjocks.com/replies/1129873

-- Nathan, TX -- Hire the lazy man. He may not do as much work but that's because he will find a better way.

View BurlyBob's profile (online now)

BurlyBob

5893 posts in 2380 days


#11 posted 08-17-2018 03:07 PM

I totally agree with jbay.

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