ITS the blue stuff 18 cm wide ?
15 my is pretty thick (but exelent for amt), but it's our only source of a good laminated foil . I did some inquiries as wel at different company's no luck so far.
A tool ?ioh what kind of tool ? I would love to buy some of the foil, if you can let me know what you could spare. I recon I will be testing allot 🙂 And wasting allot , since the foil width is just the right size so most stuff won't fit in the width 🙁 I noticed hehe
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Here's the drawing:
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You can get a better picture at My gallery.Here http://www.diyaudio.com/forums/gallery/showphoto.php/photo/13429/ppuser/94838
Tool's this one used at baking the diaphragm.
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The foil is blue 180mm wide
5 meter?
Seems like solhaga enjoys watching us.
Bernt
You can get a better picture at My gallery.Here http://www.diyaudio.com/forums/gallery/showphoto.php/photo/13429/ppuser/94838
Tool's this one used at baking the diaphragm.
The foil is blue 180mm wide
5 meter?
Seems like solhaga enjoys watching us.
Bernt
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Here's the drawing:
[/url][/IMG]
You can get a better picture at My gallery.Here 80mm_dobb_m_retur - My Photo Gallery
Tool's this one used at baking the diaphragm.
[/url][/IMG]
The foil is blue 180mm wide
5 meter?
Seems like solhaga enjoys watching us.
Bernt
Oh nice one with return path🙂 and 180 but if it's useful for me depends on my motor I gues 🙂 I might be doing some small ones first to get a feel and I would like to take it systematical this time I will try to make allot of membranes. And change only one parameter at a time like plate depth , width . By the way I am not yet completely on par with al the terms of the fold could you explain ? Like thickness plate depth width etc so I will not cause any confusion 🙂
5 meter if you have more I buy more but I thought you stated you only got 50 meters don't want to spoil all your precious foil. Maybe we could order more at your source ?
Plating tool is very very kind of you but since I want to play with it and the stacking method for me looks more useful since you can change at least one parameter. And I am scared. To demolish aenbrame when putting the 2 halves together.so I'm ok with only the foil 🙂 but still very kind of you !
solhaga Enjoying yourself ? Haha
You both only use the cameo ? No more etching ?
Oh one last thing the Alu pet foil. There is not 15 Alu on it my resistances are always pretty low. I did measure around 24 micron of total thickness . Aldo the Mylar feels way more rugged the. 6 micron , but this could be the glue as wel adding a few micron 🙂
You can use Paint to schrink or expand the drawing,no exquse there.
15my +7my is 22my.
I can't order more.
I was very lucky to get this.
I am not using it anymore. I like the lamination alu/glue/pet .Think it reduces resonanses
in the low end.
If you use my tool you have to fold the membrame first.You can make different pleat depth with it.
Bernt
15my +7my is 22my.
I can't order more.
I was very lucky to get this.
I am not using it anymore. I like the lamination alu/glue/pet .Think it reduces resonanses
in the low end.
If you use my tool you have to fold the membrame first.You can make different pleat depth with it.
Bernt
oooh that brings me to this question! what glue do you use ? i thought about laminating my own foil or kapton , since kapton is widely available in tape form 🙂 up to 200 mm and thicker in 300. but kapton without adhesive is available from 12 micron and up 🙂
about the shrinking in paint, there might be a relation ship to alu/foil as well 🙂 to how far the foil extends to where it curves.
if your not using it 🙂 i would love to buy 5-10 meters 🙂 if you could part with it of course 🙂
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oh was missed that one. i was prob in the train.
what i notice is that some folds wont move that much compared to there neighbor. or the outer ones. and the latest video's it becomes more random. they wont move in sync anymore so it seems.
i wonder if there should be some sort of retaining in the middle ? it looks because they are more ferely to move in the middle of the membrane (in the length) they start to bend, moving more in the middle and less in the edges and they start to turn , a bit like a ribbon without corrugation.
Remember that in these videos the membrane is out of its linear range, both frequency wise and amplitude (excursion) wise.
The sequences were in real time 10 s @ 600 fps, so if your viewer has 60 fps, the sequences will be 100 seconds and thus a tenth of the real time.
To me it looks like the membrane at a certain excursion leaves the linear accordion movement and instead exhibit a number of failure modes.
In the last clip, the folds to the left seem to work correctly but as the are collapsing due the Lorentz' forces, there's simply not any compliance left for the rightmost folds.
At the moment I have and Xo 250 Hz, the slope will probably to have be 24 dB/octave or more.
I will make some tests with a DC slope instead
I don't want a retainer as it would most probably cause more trouble, that is distortion, than it's worth.
The sequences were in real time 10 s @ 600 fps, so if your viewer has 60 fps, the sequences will be 100 seconds and thus a tenth of the real time.
To me it looks like the membrane at a certain excursion leaves the linear accordion movement and instead exhibit a number of failure modes.
In the last clip, the folds to the left seem to work correctly but as the are collapsing due the Lorentz' forces, there's simply not any compliance left for the rightmost folds.
At the moment I have and Xo 250 Hz, the slope will probably to have be 24 dB/octave or more.
I will make some tests with a DC slope instead
I don't want a retainer as it would most probably cause more trouble, that is distortion, than it's worth.
Finished up my snacks, so I'll will try to pop this thread back on topic.
I'm doing some research right now.
This is how a membrane with 2x10 mm pockets and 4,4 mm alu with 7,6 mm bare mylar measure, awful isn't it?
The distortion is high due to the large amount of free mylar.
The HF drops a little bit too soon.
SPL in LF is good though.
Made some DC tests, quite interesting, for instance isn't the pockets moving as linear as one would expect. This is probably due to the fact that the alu sides is not that parallel.
Next up is a membrane with 2x10 mm pockets and 10 mm alu with 2 mm bare mylar in the folds.
I'm doing some research right now.
This is how a membrane with 2x10 mm pockets and 4,4 mm alu with 7,6 mm bare mylar measure, awful isn't it?
The distortion is high due to the large amount of free mylar.
The HF drops a little bit too soon.
SPL in LF is good though.
Made some DC tests, quite interesting, for instance isn't the pockets moving as linear as one would expect. This is probably due to the fact that the alu sides is not that parallel.
Next up is a membrane with 2x10 mm pockets and 10 mm alu with 2 mm bare mylar in the folds.
Attachments
Having aluminium on the whole 10 mm side of the 10 by 2 mm pocket looked really good in the DC-tests. No unwanted motion at all.
Of course, the compliance isn't that good now that the only thing that can give are the actual folds. But as I now aim for a 3 times as high AMT as before, the lower SPL doesn't matter.
What matters is low distortion levels and a reasonable frequency range.
With 10 mm wide aluminium strips I only got 2 ohms resistance, so I had to do the measurements with a 6 ohm resistor in series.
Got LF, low enough distortion level to work with but a lousy HF.
As I recall my earlier "research", it is the pocket area that matters when it comes to HF. The pocket area, here it is 10x2 mm, probably constitutes a HH resonator, effectively cutting the HF response.
So next step would be to make a 6,5 x 1,5 mm pocket membrane but with aluminium on the whole 6,5 mm pocket side.
Or perhaps a not so deep 2 mm wide pocket membrane.
If I only had an adjustable folding tool, both depth and width...
Of course, the compliance isn't that good now that the only thing that can give are the actual folds. But as I now aim for a 3 times as high AMT as before, the lower SPL doesn't matter.
What matters is low distortion levels and a reasonable frequency range.
With 10 mm wide aluminium strips I only got 2 ohms resistance, so I had to do the measurements with a 6 ohm resistor in series.
Got LF, low enough distortion level to work with but a lousy HF.
As I recall my earlier "research", it is the pocket area that matters when it comes to HF. The pocket area, here it is 10x2 mm, probably constitutes a HH resonator, effectively cutting the HF response.
So next step would be to make a 6,5 x 1,5 mm pocket membrane but with aluminium on the whole 6,5 mm pocket side.
Or perhaps a not so deep 2 mm wide pocket membrane.
If I only had an adjustable folding tool, both depth and width...
Attachments
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