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Reply by Lazyman

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Posted on lumber thickness for bench

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Lazyman

3873 posts in 1867 days


#1 posted 08-14-2018 02:00 PM

A picture is worth a thousand words. While I think that 1” thick would probably work okay, the overall structure will keep it together, having only 1/4” on either side of a 1/2” tenon would make me want to keep the thickness at 1.5” or at least make the tenon thinner. I actually like the proportions in the drawings myself. I think that you want the seat to look like it has a enough bulk that a 250 pound person can sit on it. Note that the sagintor is for a static load not impact of someone sitting down. Remember that a heavy person plopping down has gravity helping so I wouldn’t be surprised if there was a moment of stress greater than 400 lbs at the point of impact (though I didn’t do any math to verify that assumption).

As long as your stretchers are well attached, the loose tenons to attach the legs to the seat will be plenty strong but if you want a little extra strength, you could drill a hole through the tenon for a dowel after you assemble the joint.

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


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