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BG NEO 3 FR optimization
BG NEO 3 FR optimization
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Old 2nd January 2018, 10:30 PM   #31
dheming is offline dheming  United States
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Quote:
Originally Posted by Fjendbo View Post
Hi,

Would you mind sharing your 3D model in a format Cura 3D can handle? I have a Neo3 project on the way and would love to try it out!
Looks like Cura 3D supports STL, 3MF and OBJ file formats, which will be no problem for me to export from Rhino.

However, my current model is not accurate enough to 3D print since I merely worked on top of a picture I found:

BG NEO 3 FR optimization-catenary_waveguide_02-jpg


I can pretty much guarantee that it won't line up with a real Neo3. So I'm going to head over to storage today and look for my tweeters. Then I can measure them properly with calipers and make a new model. When it's done I'll post it on my GrabCAD profile so that anyone can download it.
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Old 3rd January 2018, 07:10 AM   #32
Fjendbo is offline Fjendbo  Denmark
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Quote:
Originally Posted by dheming View Post
Looks like Cura 3D supports STL, 3MF and OBJ file formats, which will be no problem for me to export from Rhino.

However, my current model is not accurate enough to 3D print since I merely worked on top of a picture I found:

Click the image to open in full size.


I can pretty much guarantee that it won't line up with a real Neo3. So I'm going to head over to storage today and look for my tweeters. Then I can measure them properly with calipers and make a new model. When it's done I'll post it on my GrabCAD profile so that anyone can download it.
Sounds absolutely terrific! Thank you
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Old 3rd January 2018, 11:31 AM   #33
Tazzz is offline Tazzz
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How much effort is needed for the cad drawings?

Would you consider making a model fitting the neo8 aswell? If provided the measurements?
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Old 5th January 2018, 04:56 AM   #34
dheming is offline dheming  United States
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Quote:
Originally Posted by Tazzz View Post
How much effort is needed for the cad drawings?

Would you consider making a model fitting the neo8 aswell? If provided the measurements?
Doing the actual modeling ain't too bad at all. It's the taking careful measurements of every single detail that takes time. So yeah, if you provided measurements for the Neo8 I could make a model for it as well pretty quickly.

Speaking of which I finally got my Neo3 tweeters and calipers from storage today. Had to deal with automotive trouble the past few days. :/
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Old 5th January 2018, 07:54 AM   #35
Fjendbo is offline Fjendbo  Denmark
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Actually, I would be interested in a model for the Neo8 as well
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Old 5th January 2018, 11:28 AM   #36
RogerGustavsson is offline RogerGustavsson  Sweden
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The Neo 8 have a problem with the internal resonance, some kind of standing wave between the front and rear plates. Removing one of the removes the problem but you also reduce the output level and so´me changes at the lowest frequences.
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Old 5th January 2018, 11:16 PM   #37
dheming is offline dheming  United States
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So I just finished taking detailed measurements of one of my Neo3 tweeters. The numbers show that each window is a different size:

BG NEO 3 FR optimization-neo3_print_01-png
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File Type: png Neo3_Print_01.png (136.4 KB, 172 views)
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Old 5th January 2018, 11:25 PM   #38
dheming is offline dheming  United States
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Worse yet, the windows are not in a neat grid either. They deviate substantially from where they should be centered, which is a much bigger issue. So the perfectly spaced waveguide model will never match up with the real world tweeters due to the terrible punching tolerances.

Further, when I scaled the image from Parts Express to the measured width of my tweeter I get this:

BG NEO 3 FR optimization-neo3_print_02-jpg

So I'm not sure if the newer tweeters have the same height for the windows? I ordered my Neo3 pair back in 2004.
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File Type: jpg Neo3_Print_02.jpg (168.2 KB, 164 views)
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Old 5th January 2018, 11:31 PM   #39
dheming is offline dheming  United States
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When I get back home I will post two versions of the 3D model for the waveguides:

1. Version made by tracing the Parts Express image.
2. Version made using measurements of my tweeter.
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Old 6th January 2018, 12:49 AM   #40
dheming is offline dheming  United States
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Link for the Parts Express traced version: GrabCAD - CAD library
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