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Old 20th March 2013, 12:15 PM   #101
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Quote:
Originally Posted by hanski View Post
The fine pitch was a success.
That corrugation looks almost identical in pleat size to my Apogee Scintilla ribbons. Nice work!
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Old 20th March 2013, 01:46 PM   #102
dacen is offline dacen  Norway
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@ hanski. Thank you for sharing info and pictures. 3D printing? That is new to me. Any more info to the forum about that. Fantastic work! Impressive.
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Old 21st March 2013, 02:09 PM   #103
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Quote:
Originally Posted by hanski View Post
However even 0.6um thick foil has resonances and needs damping.
0.6 m sounds unrealistic to me. Maybe you meant 6 m?
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Old 21st March 2013, 03:52 PM   #104
hanski is offline hanski  Finland
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0.6um alu foil can be bought as "Imitation silver leaf foil".
At first it felt really thin, but when I started experimenting with leaf gold (0.2um)... oh man that's thin.

I used Sketchup for modelling the corrugator. A gear drawing plugin is available on the web.
Trimble SketchUp

Shapeways material called "Frosted ultra detail" is good for fine detail printing.
3D Printing in Frosted Detail Plastic on Shapeways
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Old 29th April 2013, 08:40 AM   #105
hanski is offline hanski  Finland
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Hi all,
I haven't had any luck in finding thinner than 6.5um foil.
so I started thinning down my foil with simple etching process (I used a strong alkali solution). See pic..

The results are as expected. Thinner foil has less resonances in 2 - 8kHz range.

Regardless of foil thickness, embossing seems to be more effective way of killing 2 - 8kHz resonances in pure alu tweeter ribbon than corrugation.

I wouldn't like to repeat the etching, and I woudn't recommend anyone to try it.
So a hint or a tip of thinner foil source would be very welcome, thanks.
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File Type: jpg rib.JPG (122.9 KB, 115 views)
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