Advice on joining 2 pieces of wood together - Woodworking Talk - Woodworkers Forum
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post #1 of 5 Old 05-16-2016, 12:47 PM Thread Starter
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Advice on joining 2 pieces of wood together

I seek advice on the best way to join 8 indentical interfaces where 2 pieces of wood come together, whose dimensions follow. Specifically, the type of glue, and the type of mortise and tenon, if any, are the recommendations I seek for maximum strength. This piece will remain indoors and not be exposed to the elements.

As my poor picture tries to show in its middle, I am making table legs to a square table of around 37” at its length. The table top is not shown, only its legs.

Four 2 X 4’s, of around 52” form 2 “X” patterns, as viewed directly above. The lower “X” interfaces with the floor, the upper one sits just below the table top. Each “X” is perfectly above/below the other.

I notched the middle of each 2 X 4 (upper and lower pairs) for 3 ½”, at ¾” depth so that they can interlock with each other. The upper and lower 2X4’s each form their own a “perfect X”—in other words the 2X4’s at top, and separately, the 2X4s at the bottom form 90 degree angles.

The 4 ends of each of these two 2 X4 “X” patterns (as viewed from above) interface with legs that are around 29” long. These legs are shaped as triangular prisms, that when viewed face on from the side, form a 45 degree triangle whose hypotenuse (by design) is 3 ½” (the same as the width of the end of a 2X4s these triangular prisms will interface with, and whose triangular legs have lengths are around (less than) 2 ½” each. (Again, the leg is 29” tall, but the side length of either non-hypotenuse side of the triangle comprising the table leg is just shy of 2 ½”.)

I’m thinking that given the small size of the glue up that the motise and tenon example I show in the upper right side of my attachement may not provide greater strength, and may in fact detract from it.

For what it’s worth I have scrap triangular prisms available to me to allow the triangular prism being glued up to have its hypotenuse face the sky, while 2 triangular prisms sit on either side of its length, while clamps help keep the workpiece in that orientation while the glue dries.

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post #2 of 5 Old 05-16-2016, 12:54 PM
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What kind of load?
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post #3 of 5 Old 05-16-2016, 01:40 PM Thread Starter
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...that of a kitchen table that could serve up to 8 people. The 37" square table top, a size more consistent with service for 4 diners, opens up in such a fashion to double the number of diners.

As I think about this, maybe creating two circular mortises in each piece, connected by a dowel might be good--of course of the right size diameter and mortise depth to strengthen, not diminish its load capacity.

Last edited by Arbee; 05-16-2016 at 01:45 PM.
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post #4 of 5 Old 05-16-2016, 01:56 PM
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I think you'll need more support. A proper support INSIDE the cross-members, then the triangles as facing.
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post #5 of 5 Old 05-16-2016, 09:37 PM Thread Starter
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mikechell: awesome idea!! That's what I'll do! It kills 2 birds with one stone for me 1) more support for table loads, 2) more surface area to glue the triangular prisms to--which can now in large part be an architectural element for me, not a major support member.

So glad I asked!!
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glue mortise tenon epoxy

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