Thread: What is is joint called????

Id call it a wedged 1/2 through tenon


Dave the turning cowboy

turning wood into art

Dave googling that didn't seem to come up anything.


According to Wiki

It's more complex than a:

Half shoulder tenonAn asymmetric tenon with a shoulder on one side only. A common use is in framed, ledged and braced doors.

As the one in pictures above has a angled bottom to the tenon and a wedge above.

Wedged half-dovetail
a mortise in which the back is wider, or taller, than the front, or opening. The space for the wedge initially allows room for the tenon to be inserted; the presence of the wedge, after the tenon has been engaged, prevents its withdrawal. It is sometimes called a "suicide" joint, since it is a "one-way trip".

Don't these usually have two wedges pushed into the end of the tenon not above??

Tusk tenon
a kind of mortise and tenon joint that uses a wedge-shaped key to hold the joint together.

Tusk tenon the wedge goes inat 90 deg.


Sounds like a combination, surely there is a reference for this joint.



It is referanced below and shows a cut-away view, minus the wedge.
http://www.popularwoodworking.com/wo...nch-leg-joints

For joinery to last, you need to be careful about how much material is removed. If you cut away most of a big honking leg to make a joint, you lose the structural value of the leg and may as well have used a skinnier one.At right is the bottom rail joint as I was working on it. All of the joinery was cut before the legs were laminated. To put this one together in the finished bench, the rail is lifted so the end of the rail passes through the narrow end of the socket. That narrow end is about 1/4″ wider than the rail to make this easy. When the end of the rail is through the other end, it drops down to engage the joint and a wedge is tapped in from the outside.
From the end you can see the wedge in place and how little of the leg is missing. In the event that something loosens up, a few taps on the wedges take care of it. The bench doesn’t loosen in use however, and that is the really cool thing about these joints. Most of the stress on a bench in use is in the long direction as in planing. When you push on a dovetail, the joint wedges tighter together and any wobbling stops.
If these were tenons and mortises, any force exerted in that direction tends to pull the joints apart. Yes you can drawbore the joints or bolt them together but there isn’t any wood in the joint itself to resist that force. Over time things start to wear and eventually you have a wobbly bench. The things you can do to a mortise and tenon to resist that might work, but the tradeoff is making the bench more difficult (or impossible) to take apart if you ever have to move the thing down to the basement or up the stairs.

I dont know if the one in the original pic is a 'generic' type of joint or a combination of two types


Dave the turning cowboy

turning wood into art

In my last post the cut aways don't show the angled outer shoulder on the tenon.

Provided there is enough meat left this looks like a very strong, well braced, and self tightening joint.

As seen in the top pics it would have to be cut very precise (as any joint should be)


if the shoulder is bearing on the bottom of the rail to the post / leg and on the end of the bevel to post / leg then the wedge forcing it down would not hold the bottom bevel of the tenon tight unless is is 100% accuarate. Nice joint and executed well ir very impressive


Dave the turning cowboy

turning wood into art

Originally Posted by DaveTTC

I dont know if the one in the original pic is a 'generic' type of joint or a combination of two types


Dave the turning cowboy

turning wood into art

Half-Shouldered, Through-Wedged Half-Dovetail?

Yeah I'll go with that


Dave the turning cowboy

turning wood into art

Originally Posted by DSEL74

Can one of you knowledgeable fellows tell me what this joint is called?

difficult!

Can one of you knowledgeable fellows tell me what this joint is called?

A challenge?

Alan...

Originally Posted by fletty

difficult!

True

Originally Posted by Uncle Al

Can one of you knowledgeable fellows tell me what this joint is called?

A challenge?

Alan...

You guys are brilliant, you've nailed it (not bad for a joint using no steel)


Dave the turning cowboy

turning wood into art

Originally Posted by DSEL74

Half-Shouldered, Through-Wedged Half-Dovetail?

No... definitely a through tenon... the joints in Daves pictures look like dovetails (which show through) because the are cut away demonstration pieces.

Those are some bench legs on the original post... that bench can be used as one of the legs to the Eiffel Tower!!!

Jorge

It's a 'knock down' wedge tenon.

Designed to be taken apart when disassembling.

In the main photos he's made it a little more complicated by cutting in the shoulder to the upright, these would normally be square shoulders.


Sent from my iPhone using Tapatalk

Originally Posted by cadas

In the main photos he's made it a little more complicated by cutting in the shoulder to the upright, these would normally be square shoulders.


Sent from my iPhone using Tapatalk

It's this complication which I believe could make lead to a loose joint as now there is an extra bearing surface which if not 100% accurate will either be loose or bind when the wedge is put in. Looks nice but could be a pitta.



Dave the turning cowboy

turning wood into art

That bench is clearly a 'cabinet making school' project.

When I did my training we had to make one and we all went daft on wood and joints.

My current is made from bunnings pine, mdf and nails and took about three hours to make.


Sent from my iPhone using Tapatalk