Designing a dome faceted loudspeaker

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DeepSOIC
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Designing a dome faceted loudspeaker

Post by DeepSOIC »

Hi!
It's been a while I haven't done a nice project. Now, I think I'm on to a nice one modeling-wise.

I want to build a hemispherical speaker, covered with small drivers. I want some nice pattern. I remember that golf ball contest - that's good, but that's waay too many speakers.

So the first thing I did was converting @ulrich1a's Macro Geodesic dome to be parametric, so I can more easily play with it.
https://github.com/FreeCAD/FreeCAD-macros/pull/41

Having that one done, I went on experimenting. The domes are very nice, but they are made of triangles. Triangles are not the best, they are pretty far from being round. So I tried to make something that closer resembles a dodecahedron, by truncating a dome. Here are some shapes I got:


dome1.png
dome1.png (43.69 KiB) Viewed 4978 times
dome - base shape.FCStd
(70.31 KiB) Downloaded 63 times
This one is the first one that looks reasonable. It has quite a bit of wasted surface. But at the same time, it should allow for some room for the speakers to not interfere on the inside. And it has a clear parting plane.


semi-dode.png
semi-dode.png (50.17 KiB) Viewed 4978 times
This one is the same as above, but with a bit more truncation. This one is very surface-efficient, but many sides are cut off by quite a bit by the parting plane.

With more facets comes better surface efficiency:
big.png
big.png (65.78 KiB) Viewed 4978 times
big dome for future.FCStd
(687.01 KiB) Downloaded 71 times
Now this one would be crazy big, and I don't have a large enough 3d printer to print this. But I take a note, this is an interesting design, may work with very small drivers.

That's all for now =) I hope for more progress soon.
Jee-Bee
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Re: Designing a dome faceted loudspeaker

Post by Jee-Bee »

What that is on my long list. I want to create a monopole speaker.
So i save this page :D
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bejant
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Re: Designing a dome faceted loudspeaker

Post by bejant »

A good use case for Lattice2, and all the Extrudes look pretty cool:
20190309a.png
20190309a.png (59.35 KiB) Viewed 4884 times

It reminds me of another topic, about a month before you joined the forum, DeepSOIC:
https://forum.freecadweb.org/viewtopic.php?f=3&t=7118
Joyas
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Re: Designing a dome faceted loudspeaker

Post by Joyas »

Thanks for sharing your model.
Estudié ingeniería técnica industrial en España y sólo me ha servido para estar en el paro, no me contratan porque no tengo experiencia, y no tengo experiencia porque no me contratan. No debí estudiar esa carrera.
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DeepSOIC
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Re: Designing a dome faceted loudspeaker

Post by DeepSOIC »

Some progress.
model with drivers.png
model with drivers.png (198.63 KiB) Viewed 4768 times

Slicing is tricky... Still not happy with the result.
slicing wip.png
slicing wip.png (668.55 KiB) Viewed 4768 times
schupin
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Re: Designing a dome faceted loudspeaker

Post by schupin »

Nice work (even if it's in progress :))

What is the lattice motif you're using to fill in your dome ?
You designed it by yourself or it's defined in your slicer ?
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DeepSOIC
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Re: Designing a dome faceted loudspeaker

Post by DeepSOIC »

schupin wrote: Sun Mar 10, 2019 5:34 pm What is the lattice motif you're using to fill in your dome ?
You designed it by yourself or it's defined in your slicer ?
It's slic3r's "gyroid" infill (cool AF). I think it's a feature of slic3r prusa edition only, the Alessandro Ranellucci's one I think doesn't have it. Also I think it's there in Cura.
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DeepSOIC
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Re: Designing a dome faceted loudspeaker

Post by DeepSOIC »

Printed!
enclosure.jpg
enclosure.jpg (295.03 KiB) Viewed 4699 times
testing if drivers fit.jpg
testing if drivers fit.jpg (360.46 KiB) Viewed 4699 times
Drivers not wired up, and the enclosure not sealed yet. Just dropped them in to see how they fit 8-)


EDIT: the model!
https://drive.google.com/open?id=1Lpgt3 ... joe3HKGtvh
(1.1 MB)
Last edited by DeepSOIC on Sun Mar 17, 2019 2:58 pm, edited 1 time in total.
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kkremitzki
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Re: Designing a dome faceted loudspeaker

Post by kkremitzki »

It looks very cool, I'm very curious as to how that will end up sounding! :D
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triplus
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Re: Designing a dome faceted loudspeaker

Post by triplus »

Looking good.

P.S. If it sounds good ... That we will just have to wait and see, and hear. ;)
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