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Multi-Way Conventional loudspeakers with crossovers

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Old 28th February 2020, 09:34 AM   #1111
mabat is offline mabat  Czech Republic
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Thanks! That looks quite good to me.
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Old 28th February 2020, 07:53 PM   #1112
jzagaja is offline jzagaja  Poland
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Solidworks is so limited - even intersected profiles don't help.
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Old 28th February 2020, 09:27 PM   #1113
limacon is offline limacon  United Kingdom
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The tool I’m working on exports to parasolid ascii curves and user selected thickness / solid. Also 3D wavefront simulation from throat. Trying to keep up with mabat changes!!!
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Old 28th February 2020, 10:32 PM   #1114
fluid is offline fluid  Australia
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Quote:
Originally Posted by mabat View Post
Thanks! That looks quite good to me.
The surafce loft is very close to the mesh I turned off the hidden edges to show it more clearly. Mesh surface is pink.

-meshvloft-jpg

Patching the surface to make a solid and cutting it out of a bigger block to represent a baffle gives exactly the same result. So it's only when you thicken that care needs to be taken to make sure the profile matches.

-mesh-vsolid-cut-loft-jpg
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File Type: jpg Mesh vSolid Cut Loft.jpg (91.7 KB, 495 views)
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Old 28th February 2020, 10:39 PM   #1115
fluid is offline fluid  Australia
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Originally Posted by jzagaja View Post
Solidworks is so limited - even intersected profiles don't help.
Try lofting without the guide curves, just the profiles, that's how it works in Fusion. Solidworks drives me mad because I don't know enough to make it do what I want, Fusion is much more intuitive, and free for non commercial use.
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Old 29th February 2020, 04:52 AM   #1116
fluid is offline fluid  Australia
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Here's another way (not necessarily better) to make a solid waveguide with greater thickness without using the thicken command. Looks like this, pdf guide of the steps attached below

-finished-top-jpg

-finished-bottom-jpg
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File Type: jpg Finished Bottom.jpg (26.9 KB, 260 views)
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File Type: pdf Another way to make a solid.pdf (376.5 KB, 30 views)
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Old 29th February 2020, 11:33 AM   #1117
mabat is offline mabat  Czech Republic
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Ath 4.4.3 beta

For those impatient, here is a beta version with some quick instructions of how to proceed (see the README file): Ath 4.4.3 beta
It should work. What's still missing is the second surface for adding thickness.

Looking forward to see your renders!

Edit: Oops, the scale of the profiles was still wrong. Please download again, if you already did so.
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Last edited by mabat; 29th February 2020 at 11:55 AM.
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Old 29th February 2020, 12:01 PM   #1118
fluid is offline fluid  Australia
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Originally Posted by mabat View Post
Ath 4.4.3 beta

For those impatient, here is a beta version with some quick instructions of how to proceed

Looking forward to see your renders!
Awesome, downloading now I'm also solving the M2 style waveguide up to 20K for curiosities sake, let's see how long it takes.
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Old 29th February 2020, 12:44 PM   #1119
mabat is offline mabat  Czech Republic
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Now I'll tell you a secret.

1) There is a parameter "Mesh.DepthSegments" that is well known. It defines the number of "slices" for the mesh and STL. This is also the number of slices written in the coordinate file.

2) There is a mapping of z coordinates (distances from the throat) for these slices that is controlled by a Bezier cubic. On the graph below you see the default setting. This can be changed by a parameter Mesh.ZMapPoints. For the default values it would be:

Mesh.ZMapPoints = 0.5,0.1,0.5,0.99

The numbers are just the coordinates of the cubic control points (x1,y1,x2,y2), normalized to interval <0, 1>.
You can easily setup you own slice spacing by this interactive graph: Desmos chart - Bezier cubic for Z-Map - slide the middle two orange control points.

I think that in most situations the default values will work just fine. You can change that however and maybe it's good to be aware of.
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Last edited by mabat; 29th February 2020 at 12:53 PM.
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Old 29th February 2020, 01:20 PM   #1120
mabat is offline mabat  Czech Republic
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Desmos script two (a better one): Bezier Curves
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Last edited by mabat; 29th February 2020 at 01:25 PM.
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