What is the strongest 90 degree wooden corner joint?
I will be more specific then. I'm trying to join two sheets of 18mm thick poplar plywood board together at 90 degrees. it needs to be mega strong but not be any thicker than the 18mm. I thought of dovetail joints but i can add components to make it stronger. additional components could be used.
Answer:
Dovetail is fine but mortise and tennon is also very strong see below forsome idea's
http://www.orinda.k12.ca.us/ois/it/wood-...
You can always put brads into the top and bottom of the dovetail joint to make it a little stronger ('top' and 'bottom' from the point-of-view of looking down on the 90 degree angle).
You can put brads into the middle part of the joint at a steep angle
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The strongest is the corner of my wooden bed. I get a hit on my toe every time I pass by...I hate it!
There are many solutions to this Q. The key considerations are
* Ensure that the mating surfaces are cut (or machined) accurately to make as much use of the frictional forces of the material itself.
* Ensure the mating surfaces are clean and free of dust.
To further reinforce the joint, consider using a proprietary wood adhesive
In terms of adding components, some form of screwed-on L-shaped angle bracket to the outer 90 angle and same for inner angle. You could of course just use plastic conti-blocks for this purpose.
If your design permits, pin a sheet of hardboard across the back of the angle (like say a drawer bottom panel). This makes the joint "very" strong
If you use adhesive or bracketry, it is advisable to firmly clamp the components together and in the desired position before final fix.
Dovetail
Three inches from each end and spaced in the middle at 6" apart.
The strength of two pieces of 18mm plywood can only really be the combination of two things, the mechanical fitment of the two pieces of wood, ie in ure case the dovetail joints (One of the very strongest of wood joints) and a good polyurethene wood glue, such as Gorilla glue, this would make the joint as strong as possible with a dovetailed joint.If you are not prepared to go the dovetail route then i would recommend using Pocket Hole fixings (Kreg jigs/systems are the best) the concealment of the screws and their pulling force and the use of a good wood glue would probably make the overall joint as near to a dovetail joint in strength. hope this helps
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