This is a chair born out of necessity. Well, not really. It just sounded cool. It is quite comfortable though. In fact, I am sitting in it now. But I digress. I got all of the wood I used from the Sears store in my city. So the only things I bought were the two bolts and nuts. Overall, this project cost me 20 cents. Not bad.. It folds too for easy storage.
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You will need:
2-3"x.25 bolts
2-.25" Nuts
4-40" 1x1.75 Boards
2-78" .75x3.5 Boards
I know these are strange messurements, but I did get these boards from pallets. You can use many different sized boards but these worked well for me.
Tools:
Chop saw
Straight edge
Tape Measure
Finishing Nails
Wood Glue
Drill
1/4" bit
1/16" bit
2-3"x.25 bolts
2-.25" Nuts
4-40" 1x1.75 Boards
2-78" .75x3.5 Boards
I know these are strange messurements, but I did get these boards from pallets. You can use many different sized boards but these worked well for me.
Tools:
Chop saw
Straight edge
Tape Measure
Finishing Nails
Wood Glue
Drill
1/4" bit
1/16" bit
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Before anyone here builds this chair I want to warn you!
The shear load in the brads that secure the bottom back board are quite high!!
For a 115 lb. person the shear load that the brads must support per side is 263 lb. This is proportionately higher for a person that weighs more than 115lb and doesn't sit GENTLY onto this chair.
I would exclaim that this board should be secured with #10 screws x 2" lg. and maybe three per end.
The 1/4 bolt is another situation. The seat support and back support each must resist a loading that creates a unique stress analysis.
Either the seat support or the back support must resist half of this 263 lbs. or 131 lbs. Now imagine that the bolt is being twisted in both the seat support and the back support to support the 113 lbs.
Now, assume that the first 1/4 inch from each side of one of the supports does most of the load carrying job to resist this twisting stress. The wood stress is then 1050 psi. This is only a factor of safety of maybe 3 for loads for parallel to the grain and EXCEEDS the stress perpendicular to the grain for certain species of wood.
Now if the person weighs more than 115 lbs. and doesn't sit down gently but drops onto the chair creating several g's of force increase then failure will surely ensue.
In summation, it really concerns me when we have individuals creating systems without any consideration of the physical properties of the materials that they are working with.
OK, I did not understand what you were up to.. thought you were using actual pallets. They are built with huge staples. Here, pallets are usually oak, very strong but hard to sand. This looks like southern yellow pine, which is great too.
It seems to me they could have been mounted on the top and the chair would still be foldable as long as the back resting slats remain screwed on the "rear" of their respective mounts.
The benefit I see is that it would be much stronger as I would think that 75% or more of the weight rest on these three slats.
Or did I miss something ?