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Měli byste zájem o nabídku hotových STH zvukovodů? |
Měl bych zájem o menší verzi (k basáku 8" - 10") |
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20% |
[ 6 ] |
Měl bych zájem o větší verzi (k basáku 12" - 15") |
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36% |
[ 11 ] |
Měl bych zájem o nějakou formu stavebnice (menší rozměr) |
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13% |
[ 4 ] |
Měl bych zájem o nějakou formu stavebnice (větší rozměr) |
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10% |
[ 3 ] |
Nemám zájem. |
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13% |
[ 4 ] |
Nemám zájem a věřím, že horny zkreslují jako pr... a samozřejmě velmi slyšitleně. |
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6% |
[ 2 ] |
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Celkom hlasov : 30 |
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MaBat Hifi inventar
Založený: 21 november 2007 Príspevky: 12818
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Zaslal: So máj 25, 2019 09:18:58 Predmet: |
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jzagaja napísal: | I've made several cross section planes and intersection curves (polylines) in Solidworks. Resulting surface is good match but still very slow to operate. |
Jacek, if you suggest some feasible way how to convert point cloud (by separate cross-sections or whatever) into a smooth surface to work with, I'm all for it. I would just need a specification for my output. I can do virtually anything with the point cloud itself. I can generate Solidworks scripts, etc. - just give me some example. I don't work with 3D CADs at all, so my knowledge of this is very limited.
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Návrat hore |
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jzagaja Hifi obsluha
Založený: 09 október 2009 Príspevky: 37
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Návrat hore |
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jzagaja Hifi obsluha
Založený: 09 október 2009 Príspevky: 37
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Návrat hore |
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MaBat Hifi inventar
Založený: 21 november 2007 Príspevky: 12818
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Zaslal: So máj 25, 2019 09:56:44 Predmet: |
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So how much different would the resulting shape be if I gave you just these four curves (in red)?
As I understand, this is how the surface can be constructed. Right?
https://www.youtube.com/watch?v=fIzEDqL0kUE
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jzagaja Hifi obsluha
Založený: 09 október 2009 Príspevky: 37
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Zaslal: So máj 25, 2019 14:37:40 Predmet: |
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If you gave me points I will draw splines and compare. Can be coarser set.
I did 7 intersection curves with mesh and surface loft computation was very slow. I couldn't thicken resulting surface.
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Návrat hore |
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MaBat Hifi inventar
Založený: 21 november 2007 Príspevky: 12818
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Zaslal: So máj 25, 2019 15:25:23 Predmet: |
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OK, these are the points for the four curves shown. Same points as for the STL, you can omit some if you need (beware, the end points repeat).
If this will work, I could then create the splines directly in some script I guess. Maybe also some guidelines in the middle - I don't know about the Solidworks possibilities. The throat could be definitely set as a circle arc, no reason to re-create it from points.
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points.zip |
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jzagaja Hifi obsluha
Založený: 09 október 2009 Príspevky: 37
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Zaslal: So máj 25, 2019 18:16:40 Predmet: |
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This works perfect however I need more curves. Red is your STL and grey is resulting surface loft.
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MaBat Hifi inventar
Založený: 21 november 2007 Príspevky: 12818
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Zaslal: So máj 25, 2019 18:21:58 Predmet: |
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I think this happened to be different files/horns. These two should match, generated from the same dataset again. Please try it.
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sth4.zip |
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Návrat hore |
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jzagaja Hifi obsluha
Založený: 09 október 2009 Príspevky: 37
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Návrat hore |
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jzagaja Hifi obsluha
Založený: 09 október 2009 Príspevky: 37
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Zaslal: So máj 25, 2019 18:48:27 Predmet: |
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This is what I'm trying to do. Put foam inside.
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Návrat hore |
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MaBat Hifi inventar
Založený: 21 november 2007 Príspevky: 12818
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Zaslal: So máj 25, 2019 18:48:31 Predmet: |
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What do you suggest? It is obvious that the loft surface has not a constant throat angle accross the circumference. It just leans more directly to the corner. We could either try to specify some "tangent condition" at the throat or add more curves in the middle. It's up to you to explore, I don't have the software. It doesn't have to be exactly the same. You can make a mesh from that and try ABEC to compare. I don't know for sure which one would be better.
That looks promising.
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Návrat hore |
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jzagaja Hifi obsluha
Založený: 09 október 2009 Príspevky: 37
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Zaslal: So máj 25, 2019 19:01:33 Predmet: |
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Few more curves and match is perfect.
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MaBat Hifi inventar
Založený: 21 november 2007 Príspevky: 12818
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Zaslal: So máj 25, 2019 19:02:55 Predmet: |
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BTW, what about this?
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sth4-2.zip |
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MaBat Hifi inventar
Založený: 21 november 2007 Príspevky: 12818
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Zaslal: So máj 25, 2019 19:03:30 Predmet: |
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jzagaja napísal: | Few more curves and match is perfect. |
That's great! So which curves do you need? Just some more cross sections?
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Návrat hore |
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jzagaja Hifi obsluha
Založený: 09 október 2009 Príspevky: 37
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Zaslal: So máj 25, 2019 19:58:39 Predmet: |
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Exactly.
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MaBat Hifi inventar
Založený: 21 november 2007 Príspevky: 12818
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Zaslal: So máj 25, 2019 20:43:04 Predmet: |
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So...
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points_10.zip |
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jzagaja Hifi obsluha
Založený: 09 október 2009 Príspevky: 37
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Zaslal: So máj 25, 2019 22:40:18 Predmet: |
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Perfect Marcel! 3 deg?
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MaBat Hifi inventar
Založený: 21 november 2007 Príspevky: 12818
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Zaslal: Ne máj 26, 2019 07:16:14 Predmet: |
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OK, let's say it is good enough. It would be interesting to know the cause of the difference however, because the red shouldn't be seen much from this side, IMHO.
3 deg total. It is hard to measure, isn't it BTW what does CAD say?
One option still left open - the superellipse exponent. It affects how fast the circular throat gets transformed into rectangle. Choose what you like better. The previous was 2.0, this is 2.7. I would maybe prefer the second one, it's up to you (I can make it 2.3).
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ThroatDiameter = 35.6 ; [mm]
ThroatAngle = 3 ; [deg]
Coverage_Horizontal = 85 ; [deg]
Coverage_Vertical = 75 ; [deg]
Depth = 180 ; [mm]
Depth.HyperPart = 0.5 ; 0.5
Shape = raw2rect ; raw | raw2rect
Shape.FixedPart = 0.2 ; 0.2
SEExp = 2.7 ; superellipse exponent
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sth_2,7.zip |
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Návrat hore |
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MaBat Hifi inventar
Založený: 21 november 2007 Príspevky: 12818
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Zaslal: Ne máj 26, 2019 07:36:48 Predmet: |
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SEExp = 2.3 ...maybe a sweetspot.
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sth_2,3.zip |
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Návrat hore |
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MaBat Hifi inventar
Založený: 21 november 2007 Príspevky: 12818
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Zaslal: Ne máj 26, 2019 10:52:04 Predmet: |
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Jack, what if I gave you the guide curves for the other direction? Could you try?
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points_2directions.zip |
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Návrat hore |
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jzagaja Hifi obsluha
Založený: 09 október 2009 Príspevky: 37
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Zaslal: Ne máj 26, 2019 15:10:34 Predmet: |
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MaBat napísal: | this is 2.7. I would maybe prefer the second one, it's up to you (I can make it 2.3). |
STL model ready for printing shell 1mm.
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test_2,7.zip |
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Návrat hore |
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MaBat Hifi inventar
Založený: 21 november 2007 Príspevky: 12818
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Zaslal: Ne máj 26, 2019 17:00:23 Predmet: |
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Awesome!
- I would definitely connect the front and the back by some sparse grid, otherwise I would be afraid the foam could deform it while expanding. Well, it depends on which foam you are going to use.
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Návrat hore |
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jzagaja Hifi obsluha
Založený: 09 október 2009 Príspevky: 37
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Zaslal: Ne máj 26, 2019 17:38:58 Predmet: |
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Suprisingly it doesn't improve - opposite it worsen match by 2mm at diagonals. One must carefully choose guiding curves.
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Návrat hore |
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MaBat Hifi inventar
Založený: 21 november 2007 Príspevky: 12818
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Zaslal: Ne máj 26, 2019 17:48:22 Predmet: |
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Thanks.
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Návrat hore |
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MaBat Hifi inventar
Založený: 21 november 2007 Príspevky: 12818
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Návrat hore |
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MaBat Hifi inventar
Založený: 21 november 2007 Príspevky: 12818
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Návrat hore |
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MaBat Hifi inventar
Založený: 21 november 2007 Príspevky: 12818
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Návrat hore |
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MaBat Hifi inventar
Založený: 21 november 2007 Príspevky: 12818
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Zaslal: So jún 15, 2019 07:48:42 Predmet: |
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K výrobě:
Jedna vrstva pryskyřice LH 330 se skelnou tkaninou 24 g/m² a přes to ještě jedna vrstva samotné pryskyřice udělá na XPS tenounkou krásně hladkou a už poměrně tvrdou a odolnou slupku. Paráda.
To když se přetře voskem, neměl by být IMHO žádný problém to tak odseparovat a pak oddělit. Ale to se teprve uvidí. Ještě si hraju s tvarem samotné horny, je toho na výběr moc, to je spojitá plejáda možností a podle Ath4 a ABEC to všechno vychází hrozně hezky.
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opa Hifi inventar
Založený: 24 február 2007 Príspevky: 11183 Bydlisko: Praha
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Zaslal: So jún 15, 2019 11:04:24 Predmet: |
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MaBat napísal: | K výrobě:
Jedna vrstva pryskyřice LH 330 se skelnou tkaninou 24 g/m² a přes to ještě jedna vrstva samotné pryskyřice udělá na XPS tenounkou krásně hladkou a už poměrně tvrdou a odolnou slupku... |
No to musí určitě fungovat, jenomže je to klasický laminát z epoxidové pryskyřice a měl jsem pocit, že přesně tomu ses chtěl zpočátku vyhnout ?
_________________ Cui bono ? |
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Návrat hore |
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MaBat Hifi inventar
Založený: 21 november 2007 Príspevky: 12818
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Zaslal: So jún 15, 2019 11:43:56 Predmet: |
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To je jen povrchová úprava kopyta: http://hifi.slovanet.sk/bb/viewtopic.php?p=326256#326256
Je to v desetinách mm, ani nevím, jestli má smysl to nějak dopředu kompenzovat na tom tvaru.
Jinak pružné je to asi tak, že ztvrdlý štětec už moc neohnete.
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