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I need help with joints for this chair

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Forum topic by Randy13 posted 01-22-2014 12:28 PM 692 views 1 time favorited 8 replies Add to Favorites Watch
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Randy13

7 posts in 1249 days


01-22-2014 12:28 PM

I am thinking that the sides for the seat and back will need to be made from two separate pieces glued up and then mill out the final shape. For the bottom pieces I am thinking three pieces and same process. Hopefully you can tell from the pictures what I am thinking.
The armrests I thought would be fairly straight forward but I am actually a little unsure about how to glue up a blank that would be strong with the grain running in the correct direction.

What kind of joints do y’all think would be the strongest at what appears to require odd angles.

Hope all this makes sense.

Just a note, I haven’t completed the plan yet so there are some elements missing.


8 replies so far

View Rex B's profile

Rex B

320 posts in 1718 days


#1 posted 01-22-2014 01:32 PM

This looks to me like it would be a good application for loose tenons, or dominoes if you have one. Alternately, large dowels used like loose tenons.

-- Rex

View sras's profile

sras

4392 posts in 2597 days


#2 posted 01-22-2014 02:26 PM

Half lap joints would work well here. Lots of glue area and should look good.

-- Steve - Impatience is Expensive

View RussellAP's profile

RussellAP

3059 posts in 1754 days


#3 posted 01-22-2014 02:31 PM

I’d make the arms, legs, and seat from one piece of either 5/4 or 8/4. then add on the top of the back. Dado the seat and back slats in a dado groove. Cutting the dado into curved wood is the hard part. Are you good with a router?

-- A positive attitude will take you much further than positive thinking ever will.

View Wally331's profile

Wally331

341 posts in 1493 days


#4 posted 01-22-2014 02:33 PM

You could also think about doing bent laminations, however that would be quite a large bending form. Very strong though. I think that a bridle joint would work great though, mortise and tenon as well.

View bondogaposis's profile

bondogaposis

4037 posts in 1819 days


#5 posted 01-22-2014 03:24 PM

I would use bridle joints.

-- Bondo Gaposis

View Loren's profile

Loren

8315 posts in 3116 days


#6 posted 01-22-2014 03:55 PM

I would be tempted to emulate the cut-from-wide-boards approach
rather than having your grain direction make ragged shifts on
the outsides. If you use something with consistent grain patterns,
you can build up blanks just oversized from smaller pieces of wood,
then cut the curves out.

Make a mockup by gluing up blanks out of a few 2×4s and
see if the approach makes sense to you. Splines can be
put in where they won’t show in areas where you feel you
need them.

I think it will look more classy with the grain aligned as I
described.

That looks like a 19th century chair. They were importing these
enormous wide mahogany boards to Europe at the time and
the designers went to town with them.

View Randy13's profile

Randy13

7 posts in 1249 days


#7 posted 01-22-2014 03:56 PM

Yes I think bridle joints would be within the limits of my abilities. I should also be able to cut the majority of it on the table saw.

Do y’all think I would need to do something similar to the legs for the armrest as well?

Thanks everyone for your help.

View a1Jim's profile

a1Jim

115207 posts in 3045 days


#8 posted 01-22-2014 04:25 PM

It looks pretty straight forward, the base just glue and screw together,the arm to back mortice and tenon (loose tenons are fine),the front arm to seat glued and screwed or a dowel.
I think a bridle joint would work for the arms but I’m not to sure how it will look ,to cut it out of one piece I think it will look best, perhaps it could be resawn in half and a router out a hollow section large enough for a some metal (smaller rebar might work)reinforcement,it could be epoxied inside and glued back together,making a very strong arm. If you don’t like the idea of metal inside you could use ply wood instead.

-- http://artisticwoodstudio.com Custom furniture

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