Reply by Rich

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Posted on Mortis & tenon for bench legs

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4676 posts in 1036 days

#1 posted 08-04-2017 03:55 PM

lol, I hear bench and think one thing. The tenons really only need to be beefy enough to help eliminate racking. The shear strength on even a 1/4” tenon will be enough to support that load, plus, I assume the bench top will be resting on the tops of the legs, so that reduces shear even more.

The big thing to keep in mind is the height of your aprons, so you don’t get a lot of sag. Also, I mentioned racking. That’s one of the things that will cause problems, so I’d strongly recommend stretchers to help with the stability of the legs. Since people are sitting on it, you probably don’t want box stretchers, since that will get in the way of their feet. Look at “H” stretcher design to offer more leg room. You can google that to see what I mean.

Edit: You can also consider leg brackets to attach the legs to the aprons. Not as cool as M&T, but they work:

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