Designing a dome faceted loudspeaker

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DeepSOIC
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Designing a dome faceted loudspeaker

Postby DeepSOIC » Sat Mar 09, 2019 2:32 pm

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 3148 times
dome - base shape.FCStd
(70.31 KiB) Downloaded 27 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 3148 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 3148 times
big dome for future.FCStd
(687.01 KiB) Downloaded 31 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

Postby Jee-Bee » Sat Mar 09, 2019 4:20 pm

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

Postby bejant » Sat Mar 09, 2019 9:31 pm

A good use case for Lattice2, and all the Extrudes look pretty cool:
20190309a.png
20190309a.png (59.35 KiB) Viewed 3054 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

Postby Joyas » Sat Mar 09, 2019 11:49 pm

Thanks for sharing your model.
I prefer JavaScript, I don't like Python indentation.
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DeepSOIC
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Re: Designing a dome faceted loudspeaker

Postby DeepSOIC » Sun Mar 10, 2019 1:43 pm

Some progress.
model with drivers.png
model with drivers.png (198.63 KiB) Viewed 2938 times

Slicing is tricky... Still not happy with the result.
slicing wip.png
slicing wip.png (668.55 KiB) Viewed 2938 times
schupin
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Re: Designing a dome faceted loudspeaker

Postby schupin » Sun Mar 10, 2019 5:34 pm

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

Postby DeepSOIC » Sun Mar 10, 2019 5:46 pm

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

Postby DeepSOIC » Sun Mar 10, 2019 8:48 pm

Printed!
enclosure.jpg
enclosure.jpg (295.03 KiB) Viewed 2869 times
testing if drivers fit.jpg
testing if drivers fit.jpg (360.46 KiB) Viewed 2869 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

Postby kkremitzki » Sun Mar 10, 2019 9:47 pm

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

Postby triplus » Sun Mar 10, 2019 10:02 pm

Looking good.

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