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Forum topic by anthm27 posted 01-20-2016 07:48 AM 367 views 0 times favorited 2 replies Add to Favorites Watch
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anthm27

73 posts in 569 days


01-20-2016 07:48 AM

Attached here is a link to plans of a great design of folding stool.

Some of these folding stools appear as projects here at lumber jocks.

My question is , what would be the best way to make theses stools same design but a little higher and stronger?
At the moment the plans come in at a height of 14and1/4 inches. I would like same design at about 19 inches high.

What’s the best way to do that? I am sure its not as simple as making the legs longer. The whole seat need to be proportionally bigger. Although having said that the actual sitting platform needs to be slightly bigger but to a lesser proportional amount of the height.

anyways all ideas welcome

Regards
Anthm


2 replies so far

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HokieKen

1735 posts in 598 days


#1 posted 01-20-2016 12:45 PM

You can basically just scale it up. The legs are at ~80 degrees to each other. Keeping them at 80 will keep the load on the legs balanced as it is. You can actually increase the structural strength by decreasing that angle so the stool is taller than it is wide. That will increase the compressive load on the legs and decrease the bending load and wood is stronger in compressive strength than in bending strength. However, decreasing the angle also gives the stool less stability, the wider the legs splay the more stable it will be.

If you increase the height to 19” and increase the width (13.39” in the plan) to 18.14”, you’ll maintain the balance of strength and stability that the original design has. Any width less than 18.14” will make that stool stronger but also less stable (more likely to tip over).

If you feel like it needs more strength, you can simply increase the thickness of the wood used for the legs. Looks like they’re 7/8” wide now. If you’re using construction grade lumber, just use some 2×4s .

Hope that helps!

-- Kenny, SW VA, Go Hokies!!!

View anthm27's profile

anthm27

73 posts in 569 days


#2 posted 01-20-2016 01:03 PM



You can basically just scale it up. The legs are at ~80 degrees to each other. Keeping them at 80 will keep the load on the legs balanced as it is. You can actually increase the structural strength by decreasing that angle so the stool is taller than it is wide. That will increase the compressive load on the legs and decrease the bending load and wood is stronger in compressive strength than in bending strength. However, decreasing the angle also gives the stool less stability, the wider the legs splay the more stable it will be.

If you increase the height to 19” and increase the width (13.39” in the plan) to 18.14”, you ll maintain the balance of strength and stability that the original design has. Any width less than 18.14” will make that stool stronger but also less stable (more likely to tip over).

If you feel like it needs more strength, you can simply increase the thickness of the wood used for the legs. Looks like they re 7/8” wide now. If you re using construction grade lumber, just use some 2×4s .

Hope that helps!

- HokieKen

thanks for your detailed reply, and yes that helps a lot.
I will sit down with a scale rule and work through it.
Thanks again

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