Designing a dome faceted loudspeaker

[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 (43.69 KiB) Viewed 3438 times

dome - base shape.FCStd

(70.31 KiB) Downloaded 36 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 (50.17 KiB) Viewed 3438 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 (65.78 KiB) Viewed 3438 times

big dome for future.FCStd

(687.01 KiB) Downloaded 43 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]

What that is on my long list. I want to create a monopole speaker.
So i save this page

[bejant]

A good use case for Lattice2, and all the Extrudes look pretty cool:

20190309a.png (59.35 KiB) Viewed 3344 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]

Thanks for sharing your model.

[DeepSOIC]

Some progress.

model with drivers.png (198.63 KiB) Viewed 3228 times

Slicing is tricky... Still not happy with the result.

slicing wip.png (668.55 KiB) Viewed 3228 times

[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 ?

[DeepSOIC]

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.

[DeepSOIC]

Printed!

enclosure.jpg (295.03 KiB) Viewed 3159 times

testing if drivers fit.jpg (360.46 KiB) Viewed 3159 times

Drivers not wired up, and the enclosure not sealed yet. Just dropped them in to see how they fit


EDIT: the model!
https://drive.google.com/open?id=1Lpgt3 ... joe3HKGtvh
(1.1 MB)

[kkremitzki]

It looks very cool, I'm very curious as to how that will end up sounding!

[triplus]

Looking good.

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