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-   -   Acoustic Horn Design The Easy Way (Ath4) (https://www.diyaudio.com/forums/multi-way/338806-acoustic-horn-design-easy-ath4.html)

Pasi 27th February 2020 04:37 PM

2 Attachment(s)
Awesome. That would make it perfect.

I confirm now that thicken issue, it is caused by the throat profile as the the profile starts to intersect on itself. Work around is to do it in smaller segments and use loft / patch to fix the outside edge as needed. Many ways are now available when we can work with few surfaces rather than mesh. Surfaces can be then later combined to single body.

Outside is lofted from bottom ring to top and is thus straight line giving variable thicknes to walls.

mabat 27th February 2020 05:25 PM

1 Attachment(s)
In the meantime, attached is a (relatively) high resolution STL file for the same shape. You can try to compare the two surfaces.

This is the definition file:

ThroatDiameter = 33 ; [mm]
ThroatAngle = 0 ; [deg]
Coverage_Horizontal = 110; [deg]
Depth = 120 ; [mm]
SE_s = 0.7
SE_n = 4.0
SE_q = 0.995
Depth.ConicSectionPart = 1.0
Shape = raw2rect
Shape.FixedPart = 0.01
Shape.CornerRadius = 40 ; [mm]
Shape.StretchExp = 3

ShapeCurve = SF
SF = 1.65,2.3,4,2,5.1,2.9
SF.Rot = 0

Mesh.AngularSegments = 200
Mesh.DepthSegments = 50
Mesh.CornerSegments = 8

Out.DestDir = "D:\Horns"
Out.Write_STL = yes
Out.Write_MSH = no
Out.Write_ABECProject = no

fluid 27th February 2020 07:59 PM

Quote:

Originally Posted by mabat (https://www.diyaudio.com/forums/multi-way/338806-acoustic-horn-design-easy-ath4-post6100074.html#post6100074)
I will release it soon. This file will be simply among the output files the tool creates (i.e. the coordiantes of surface points in text format). I have it ready, just have to write some documentation...

I could help you to write some documentation if that would save you some time, if you were willing to release the tools before you write it yourself :)

mabat 27th February 2020 08:42 PM

1 Attachment(s)
Thanks but there are completely new things to describe.

- I have just implemented the loft feature into the Add-In so now it takes just one click of selecting the exported text file to get a smooth surface into Fusion 360. Cool.

jzagaja 27th February 2020 09:14 PM

1 Attachment(s)
Solidworks doesn't want to thicken.

Pasi 27th February 2020 09:29 PM

Quote:

Originally Posted by mabat (https://www.diyaudio.com/forums/multi-way/338806-acoustic-horn-design-easy-ath4-post6100796.html#post6100796)
Thanks but there are completely new things to describe.

- I have just implemented the loft feature into the Add-In so now it takes just one click of selecting the exported text file to get a smooth surface into Fusion 360. Cool.

Can you add the flanges and bolt holes too so i don't need to do anything? :D

Great work Mabat! Thank you.

fluid 27th February 2020 10:18 PM

Quote:

Originally Posted by jzagaja (https://www.diyaudio.com/forums/multi-way/338806-acoustic-horn-design-easy-ath4-post6100841.html#post6100841)
Solidworks doesn't want to thicken.

That looks like you have imported the mesh as a surface in solidworks, you have to join all the faces together to get it to thicken. If you merge all those faces together then it changes the geometry. By lofting the splines as shown before you get a single face that can be thickened.

The closest I got with solidworks and a mesh was to get solidworks to slice through the mesh at 5mm increments which gave the same sort of curves as mabat can generate, the problem was they were mesh sketches with a large number of points and it became too unwieldy to use.

The test file mabat posted can be downloaded as igs which should allow you to test it in solidworks.

fluid 27th February 2020 10:20 PM

Quote:

Originally Posted by mabat (https://www.diyaudio.com/forums/multi-way/338806-acoustic-horn-design-easy-ath4-post6100796.html#post6100796)
Thanks but there are completely new things to describe.

- I have just implemented the loft feature into the Add-In so now it takes just one click of selecting the exported text file to get a smooth surface into Fusion 360. Cool.

That's good news, lofting the splines was simple but tedious :)

jzagaja 28th February 2020 07:04 AM

Quote:

Originally Posted by fluid (https://www.diyaudio.com/forums/multi-way/338806-acoustic-horn-design-easy-ath4-post6100919.html#post6100919)
That looks like you have imported the mesh as a surface in solidworks, you have to join all the faces together to get it to thicken. If you merge all those faces together then it changes the geometry. By lofting the splines as shown before you get a single face that can be thickened.

Im could thicken by ticking option in STL import but then when I extrude driver mouting I can't do up to body or surface (thickened mesh).

Rxdroid 28th February 2020 09:57 AM

1 Attachment(s)
Superimposing the body created with loft with the stl there are no major differences, the spline model is "softer" than the stl due to its triangulation nature. Also when we export it to stl for printing that triangulation will occur again, it will depend on the export parameters to create a surface faithful to the body.


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