What's the strongest wood joint?

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I would like to know how wetting the end grain prior to glueing [common practice to increase bonding] would have changed the outcome.

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And surely it is the end grain exposure in the mitered joint which makes it so strong. Letting the glue penetrate more deeply should make it even stronger.

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Dovetails would have done better if there had been as many pin/tail pairs as the box joint — similarly, extending this, a blind dovetail should have done much better — but I would be concerned about how glue alone on endgrain would hold up over repetitive stress.

The Woodgears folks did a rather different test which is interesting:

https://woodgears.ca/joint_strength/

as did Fine Woodworking:

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Hi @WillAdams ! Good to see you hanging out. Thanks for the additional information. Hope all is well with you.