The Hammer Joint

For those who don’t read Hackaday:

Some experiments with a laser-cut mortise and tenon joint:

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Elegant design! :sunglasses:

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Ooooo…

This makes me want to run out and design something right now. Tapping that wedge in just looks so satisfying!

Thank you for sharing!

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Saw that, too! Interesting idea!!lots of potential.

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that looks pretty cool for the right project. saved a copy of that PDF out for later.

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I think you and I might be a lot alike…I felt the same way when I saw that. :slightly_smiling_face:

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interesting… don’t have an application for it just yet. but hey one never knows.

I had an idea that needs an SVG of an American flag. searched around here and found the perfect one.

so I figure I’ll be searching for this thread some day in the future.

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Intriguing!

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Love that concept…now to apply it!

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The wedge, mortise and tennon may well be man’s oldest piece of joinery, but I sure like this take on it.

I really wonder how this would work in acrylic?

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Anything to use less glue is a plus.

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Ooh! I wonder if this would be even more permanent with the addition of @dan’s serrated tabs

Gonna have to figure out something to test it with :slight_smile:

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I was thinking the same thing!

The write-up mentions something similar as a possible future evolution.

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I’m pretty sure light serrations would help in certain materials. Like acrylic.

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If anyone else wants to give this a shot before I get around to it…

Hammer joint serrated tab edit_V1

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Okay, I had to know. You know, for science.

Medium draftboard: Holds but the pin tends to go off center and split. Ify

1/8 Baltic Birch: Holds but the pin tends to go off cent and split. Ify

1/4 plywood: didn’t work at all as the kirf was too big

Thick draftboard: Pin goes off center (is this just me?) but shows the most promise, nice joint after a little tweaking

1/4 acrylic: snapped, so total failure

Thick cheery proofgrade: Best of the bunch! the outer plys hold everything together and it would be totally possible to make a great joint with this. For the win!

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Thanks for sharing your testing @markevans36301.

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I think you could play around with the wedge angle to find the happy medium between a nice tight fit and enough stress to crack the acrylic. Since the acrylic isn’t going to compress much, it wouldn’t take much of a wedge at all do do it.

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