by EFFALO, published
the design is based off of william adams' yazzo disc joint openscad script, modified to include a shape language of hexagons and pentagons for the six- and five-way connector types. the strut caps used in this prototype should fit 3/8" diameter dowels (but they might not)
update 3/16 â€” added strutcap.scad. other code forthcoming.
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Do you have more photos of that assembled dome? That's really great. How did it hold up? No buckling of the joints under the stresses?
I've been thinking of modifying the balls so they have dimples, and the socket so it has a nipple. that way they can "click" into some positions. That plus a dab of glue would make the joint way strong once you had it set at the proper angles.
I think I'm at my limit with OpenScad on making the edges of things smooth. I recently purchased Alibre, so I might revisit those designs with that tool. I suppose you could use something like MeshLab though to do some general smoothing.
Trying to calculate the proper ratio for the disc radius, based on the number of vertices was a challenge I left undone with the original design. I thought about it, but didn't tackle it. I need to take a look at some flowers, or spider webs, or something to get some inspiration.
Your idea of a
cross in the middle might be a good one. Or even a slit per vertex.
I think it's a good basic design, and I'm sure someone will be inspired to come up with something even better at some point.
agreed, flexibility is tops when you're dealing with so many joints. getting the tolerances correct was difficult; especially across different 'bots and plastics. i wonder about adding slits between the holes on the disc or cutting a + shape into the ball itself would help. need to try that out!
Ã¢Â€Â” i really dig your use of ratios for widths and heights of things; that should probably be taken into consideration with these discs! the sharp edge needs some tuning as well.
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