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DIY oak lamella/slats for classic Beolabs

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Ravsted
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Ravsted Posted: Mon, Nov 22 2021 8:47 PM

Finally found some time for this little project. 

Very happy with the result. Next is BL4000.

 

 

 

 

 

leosgonewild
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Nice job 😀

Did you oil them? (That is the most satisfying part of the job)

"You think we can slap some oak on this thing?"

Ravsted
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Ravsted replied on Mon, Nov 22 2021 9:44 PM

Thanks... No surface treatment yet.

Our dining table + coffee table (same room) is also in oak.

I usually sand them and treat them with soap (without pigmentation).

My plan is to do the same with these slats.

leosgonewild
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Are you doing the 4000’s in lamella style or like I did? (Changing the metal for oak veneer)

"You think we can slap some oak on this thing?"

Ravsted
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Ravsted replied on Mon, Nov 22 2021 10:52 PM

I am currently printing the first prototype. My speakers are black/black and my plan is to leave the original fret on the speakers and mount the slats on top. 

CB
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CB replied on Tue, Nov 23 2021 7:45 AM
Superb Smile
priklep
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priklep replied on Tue, Nov 23 2021 2:16 PM

very nice project, looks fantastic.But irritating question:

could artificially added lamellas have bad influence on sound presentation of speakers, which were not designed to have them?

Ravsted
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Ravsted replied on Tue, Nov 23 2021 3:50 PM

My plan keeping the original cover beneath the slats did not turn out very well. I changed the approach. The 3D printed part 'snaps' around the edge of the speaker and into the metal clip holding the original cover in place.

No glue, no screws ...

 

 

 

 

Ravsted
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Ravsted replied on Tue, Nov 23 2021 3:55 PM

I do not notice any sound difference... but there is surely someone out there with a more 'educated' answer ... Big Smile

Del16
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Del16 replied on Tue, Nov 23 2021 7:29 PM

Lovely job. Top class work. I’m currently modifying my Beolab 1 tower speakers. I wanted to do the same thing that your doing with your grills, but instead of using wooden fins, I was going to have chrome metal fins. Any chance you could help me create the 3D printed plastic brackets for my speakers?

Here are my current Beolab 1 mods (not finished yet)  https://www.audiocircle.com/index.php?topic=177883.0

Ravsted
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Ravsted replied on Fri, Nov 26 2021 10:10 AM

Hi,

Metal chrome fins ... I think it will look absolutely great.

The process I have shown above is a bit simplified. Draw, print, assemble => perfect result.

Honestly ... it's not like that. I probably made 3-4 prototypes of the 3D printed part for each speaker before I was happy with the result.After having finished the first BL4000 I made improvements before I finished the remaining 3.

Without having the speaker and the fins physically present, I cannot draw and print any bracket.

The oak fins are mounted without any glue, screws or adhesive tape. No modification to the speaker either. It is just a tight fit and the surface of the oak has enough friction or texture to hold them in place. That will be difficult with metal / chrome finish.

Del16
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Del16 replied on Fri, Nov 26 2021 2:03 PM

Ravsted,

               I took my Beolab 1 grilles apart and drew around a bracket with a very fine pencil. In addition to that I added imaginary ‘fins’ to the image (equally spaced apart). The overall diagram is extremely precise. Unfortunately the Beoworld website does not allow me to display or send images. Do you have an email address for me to send it to you?

Ravsted
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Ravsted replied on Fri, Nov 26 2021 4:32 PM

Click on 'Media' in the top navigation bar on this page and click on 'upload' ...

Del16
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Del16 replied on Fri, Nov 26 2021 6:40 PM

It’s not letting upload it whether I use my IPad or Mac Laptop. Instead I have uploaded it to the following Audiocircle page for you to see…

https://www.audiocircle.com/index.php?topic=177883.new#new

Del16
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Del16 replied on Sat, Nov 27 2021 5:05 PM

Luckily my Windows 10 PC is able to transfer the image of the Beolab 1 bracket. Here it is below...

Del16
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Del16 replied on Sat, Nov 27 2021 5:05 PM

Luckily my Windows 10 PC is able to transfer the image of the Beolab 1 bracket. Here it is below...

Ravsted
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Ravsted replied on Sat, Nov 27 2021 5:56 PM

Hi,

I will not print and ship any brackets to you. But I will offer you to create a STL file you can give someone who can 3D print for you. There are also services online where you upload your STL file and they will print it for you.

Del16
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Del16 replied on Sat, Nov 27 2021 7:16 PM

The Fin Lines in the image are precisely spaced apart, and are positioned in place to give us both a rough idea what they will look like.

I am going to be using 4mm thick, 10mm width aluminium bars for the speaker grill fins.

The drawing I sent you is extremely precise (16.45CM INNER WIDTH, 16.8CM OUTER WIDTH).

The original grill uses ‘rubber stickers’ attached to the inside of the bracket.

There are protruding plastic hooks attached to the front speaker baffle, which the grille itself simply slots onto.

Del16
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Del16 replied on Sat, Nov 27 2021 7:18 PM

I would like the aluminium fins to slot into place (no screws).

Del16
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Del16 replied on Sat, Nov 27 2021 7:27 PM

Here is some images I found on Google to help give you some ideas...

Del16
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Del16 replied on Sat, Nov 27 2021 7:28 PM

Del16
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Del16 replied on Sat, Nov 27 2021 7:29 PM

Ravsted
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Ravsted replied on Sat, Nov 27 2021 9:30 PM

OK... let me summarize. Please confirm.

Outer width: 168 mm

Inner width: 164,5 mm.

Fins: I will add fins to the sides, to avoid any wide open gab. 4 mm x 10 mm. The aluminium bars with come with a tolerance e.g. +/- 0,1 mm. I suggest a spacing between the fins of 6 mm. I suggest to make slots for the fins (as mine above). Width will be 4 mm, but with an opening of only 3,5 mm. I suggest they will be 5 mm. deep. They will be flexible (as mine above). When you sqeeze the aluminium bars in the opening of 3,5 mm. it will expand to 4 mm. But I cannot tell if they can hold the weight of the fins. You might need to put som glue (or thick double adhesive tape) in the buttom of the slots.

I suggest height of the bracket to be 3 cm. The width of the bracket is 16,8. What is the depth ? You can print as many as you want to get proper stability. I think 1 per 30 cm. will be fine.

Ravsted
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Ravsted replied on Sat, Nov 27 2021 11:28 PM

Based on your info the wall thickness of the bracket will be 1,75 mm.

I find your drawing "thicker". Never the less I have made a first 3D drawing and exported to .DOCX

Outer dimension is 168 x 56 mm

Wall thickness is 1,75 mm giving inner dimension 164,5

You should be able to print the A4 document and check.

If you are happy so far I can add the slots for the fins.

Link

Del16
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Del16 replied on Sat, Nov 27 2021 11:57 PM

Del16
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Del16 replied on Sun, Nov 28 2021 12:11 AM

Please look at the last image above to see how tall the bracket is.

Your recommended spacing of 6mm between each fin is good.

The slot spaces you recommend are good.

If I was to draw an overhead view of the bracket it would measure 3cm as you recommended.

Ravsted
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Ravsted replied on Sun, Nov 28 2021 9:42 AM

OK 

Please print this #A4 Document# with a precise cross section and check against current bracket and speaker. I guess the curve doesn't have to match 100% as no one can tell when the fins are there.

If you are happy so far I can add the slots for the fins.

Del16
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Del16 replied on Sun, Nov 28 2021 7:55 PM

Del16
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Del16 replied on Sun, Nov 28 2021 7:58 PM

As you can see in the image above, I superimposed your image over the  top of mine. Looks pretty good. getting there.

Ravsted
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Ravsted replied on Sun, Nov 28 2021 8:08 PM

Hi,

What is ment by 'thicker' lines required?

With the inner and outer width you specified the thickness (of the two legs) will only be 1.75 mm.

If you want them thicker either inner or outer width must be changed. 

164.50 + 1.75 + 1.75 = 168.00

Del16
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Del16 replied on Sun, Nov 28 2021 8:35 PM

Ok just ignore the thicker line comment 

Ravsted
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Ravsted replied on Sun, Nov 28 2021 10:05 PM

OK... we now have the "contour" in place. This is as good as it gets. I will add slots for the fins later... and some additional "walls" to make it more rigid. Similar to those in your drawing.

Del16
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Del16 replied on Mon, Nov 29 2021 1:01 AM

Looking good

beocool
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beocool replied on Mon, Nov 29 2021 7:27 AM

Great job, Ravsted Yes - thumbs up

 

Vähintään yhdeksänkymmentä prosenttia suomalainen! 

Ravsted
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Ravsted replied on Mon, Nov 29 2021 1:19 PM

Final drawings.

3 to choose from. If there is room... go for the strongest. I will create the STL file when I know which one you choose.

 

 

 

This is how it will look with the 4x10 aluminium

 

 

Del16
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Del16 replied on Mon, Nov 29 2021 1:33 PM

I like the ‘second one’ from the top

Ravsted
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Ravsted replied on Mon, Nov 29 2021 2:29 PM

Looking forward to see the result. Remember to share it with all of us.

I will recommend these print settings.

Material: PLA MAX or PETG

Infill: 100%

Support: No

I have asked Santa to give me a pair of black Beolab 1's for xmas... We'll see. Maybe I will be able to reuse these brackets and sqeeze in some nice oak fins/lamella/slats. Big Smile

Ravsted
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Ravsted replied on Mon, Nov 29 2021 2:32 PM

Del16
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Del16 replied on Mon, Nov 29 2021 3:42 PM

Incredible work! Ok I will keep you posted. By the way, you will fall in love with the Beolab 1’s

 

 

Del16
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Del16 replied on Mon, Nov 29 2021 3:55 PM

Is there any chance that I could pay you to print just ‘ONE’ Bracket for me to test on my Beolab 1’s, just to make sure that it definitely fits?

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