Designing easy to use wire stator. with HPL and a CNC router. - diyAudio
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Old 3rd June 2013, 05:23 PM   #1
WrineX is offline WrineX  Netherlands
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Default Designing easy to use wire stator. with HPL and a CNC router.

Hi.

after some hard work i finally have my diy CNC router machine workinghttp://www.youtube.com/watch?v=3fzRZKVsHFw&feature. so time to design a esl panel mid/high with wires. wich i can make over and over if needed.

im pretty new to the wire stators so if you see anything that could be better pls let me know, after all thats why we are here.


The panel is gone be a , mid high panel. with 0.5mm2 wires. outside diameter is 2 mm.

membrane suface is 408~ cm2 (6 cm x 68 cm) , stator spacing to membrane is 1mm, not sure yet if a wire stator is up to the task of these tight tolerances yet. but we will see.

outside dimensions are 72 x 10 , mebrane width is 6 cm. i forgot the right formula to know when beaming starts at this width have to look it up again, and again.


i first had holes to put the wire through at each end but this was verry time consuming, to do a whole frame. so i decided to make this teeth, so i can wind the wire while i suspend the frame on 2 blocks and a clamb in the midle of the frame to create a bow shape. when all wires are wounded hand tight, i realease the clamb's and they should be nice and stretched agains the supports. (theory)

before i release it, i put epoxy resin on all supports and the small space between the teeth section and the first support.

bolt it to a table and wait till its dry.



some picture of the design, im still waiting on a 2mm cutter for the teeth, and HPL plate high presure laminate. its verry stiff and machines well. each stator will be 6 mm thick. when its bolted together its pretty stif. nice thing to is HPL isolates pretty well and cheap, not as cheap as wood but much much stronger.


the 2 stators , after mebrane is attached and coated will be bolted together with the pre drilled holes. i also drill some extra holes for mounting the whole thing in a frame
Attached Images
File Type: jpg front trespa ESL.jpg (28.4 KB, 229 views)
File Type: jpg detail wire.jpg (108.4 KB, 228 views)
File Type: jpg supports.jpg (199.1 KB, 228 views)

Last edited by WrineX; 3rd June 2013 at 05:50 PM.
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Old 3rd June 2013, 05:57 PM   #2
WrineX is offline WrineX  Netherlands
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oh, i just thought about cutting 2 mm wide slots 1.5 mm deep,in the supports in the middle, so there is no need to make a tool to keep the wires nicely seperated.

forgot to mention that the space between the wires is 1 mm so. 33% open. hope that is enough

Last edited by WrineX; 3rd June 2013 at 06:08 PM.
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Old 3rd June 2013, 06:12 PM   #3
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That's awesome.
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Old 3rd June 2013, 08:14 PM   #4
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Typically the beaming starts when the width of the panel equals 1 wavelength and greater.
At 1 wavelength of width, the pattern transition's to a figure 8 pattern and gets narrower as the frequency gets raised.

Here are some simulations that I have done,

http://www.esldiy.com/esldiy/forum/i....msg212#msg212


FWIW

jer

Last edited by geraldfryjr; 3rd June 2013 at 08:25 PM.
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Old 3rd June 2013, 08:24 PM   #5
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Yum, looks like it's cover in chocolate.
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Old 3rd June 2013, 08:34 PM   #6
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Ahhh,ha,ha,ha,ha.....Yes, It is kind of a neat color, Thanks !!

jer
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Old 3rd June 2013, 08:40 PM   #7
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How would these sound hooked up to my f5?
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Old 3rd June 2013, 08:47 PM   #8
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They are ESL's I am sure they will sound great!!!
I know my previous ones did, only they couldn't take the higher than normal voltages I was trying to apply, So I started a new design.

I have not finished those particular ones yet, But I don't anticipate any problems with them.
I will be getting to them very soon though.

Cheers!!!

jer
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Old 3rd June 2013, 08:50 PM   #9
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33% open area is a bit tight!

I would shoot for no less than about 40% to 45% or so of open area.

FWIW

jer
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Old 3rd June 2013, 08:51 PM   #10
WrineX is offline WrineX  Netherlands
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ok then it start beaming on 5750 Hz, thats a bit to low for my likings. maybe i narrow it some more, or try sigmmentation, with a slightly larger panel.

Gerald verry nice picture in ur link. nice to see the actual effects.


i might try to sigment them in 2 sections, a fullrange 2 cm for 4K and up to 20K and the other till 4 k in conjunstion with the first makes 6 cm.

but ofc in have to find a balance in output. thought i had a simple spreadsheet for this somewhere.
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