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Old 27th August 2013, 01:55 AM   #321
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Well count me impressed! Nicely executed, clean lines and all. Must sound like a million



Mike
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Old 27th August 2013, 05:32 AM   #322
solhaga is offline solhaga  Sweden
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I guess that the bond between polyester and aluminium is far better than that of the 74 tape and aluminium foil.
Perfect for lower frequencies/higher excursions.

Now having a thicker aluminium (12 um instead of 10 or even 7) and the same thickness for the polyester as for the 74 tape but lacking the glue, the weight should be the about the same as for the old membranes.
So even for high frequency AMTs this method is better.

Quote:
I hope to make 2 80x40mm
Based on the pictures above, that´s around 1 mm wide and 6 mm deep pleats then?

I haven´t tested the photo resist method yet, sorry.
The hard part of that method is to get an original artwork that has sufficent shading; printing a pattern on a photo paper would hardly suffice.
But I haven´t giving it much thought, perhaps one of these days...
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Old 27th August 2013, 09:00 PM   #323
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I have managed to make a double strip layout for 80mm amt:
[IMG]Click the image to open in full size.[/IMG]
Will print and etch it tomorrow.

Bernt
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Old 27th August 2013, 09:15 PM   #324
Rewind is offline Rewind  Sweden
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Print speakers... What has the world come to? It takes me days to make one single horn. ^^,
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Old 28th August 2013, 05:35 AM   #325
solhaga is offline solhaga  Sweden
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Looking really good!

Have you tested the re-bake after the folding yet?

Instead of using a laminator, could a hot iron be used (checking the temperature with a pyrometer before ironing)?
And/or perhaps instead of a laser printered photo paper an "Iron on transfer paper"?
More expensive for sure ($2 for one A4 sheet) but then an ordinary inkjet printer can be used.

But on the other hand, a Samsung ML-2165W laser printer only costs $100 and can be used for text documents as well.

Last edited by solhaga; 28th August 2013 at 05:55 AM.
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Old 28th August 2013, 03:47 PM   #326
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A sealing iron used for applying wing skin to R/C aircraft would work. We also use non contact IR thermometer (thermopile) for accuracte results.

450 Degree Sealing Iron from Hobby Lobby
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Old 28th August 2013, 05:39 PM   #327
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Others have tried to iron laserprintings and found it is better to use a laminator .Search at Youtube for:toner transfer pcb.
I have tried to etch the double layout,and had problem with remowing the paper.
It looks like that:
[IMG]Click the image to open in full size.[/IMG]
I have used semi glossy paper.It have to be glossy. Will try if I get more alu/mylar foil.
Have not tried to fold and bake it.
Have found another suplyer of alu/mylar:http://www.gapcable.com/aluminium-fo...ical-info.html

Bernt

Last edited by båndsei; 28th August 2013 at 05:46 PM.
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Old 29th August 2013, 06:30 AM   #328
solhaga is offline solhaga  Sweden
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Get it. Transfer paper for fabrics will not work, it has to be laser toner.

Do you think a simple laser printer as the one I mentioned above will do?

Perhaps you haven´t wait long enough before trying to peel off the paper, more than 10 minutes as someone mentioned when I googled this?


I think this method also can be used with the alu/paper foil I´m using.
The 74-tape then has to be attached after the transferal but before the etching.

So possible steps are:
  • Transfer toner to alu/paper´s alu side.
  • Peel off paper of alu/paper (the alu still has the photo paper on the alu side, so the alu is still supported)
  • Apply 74 tape
  • Peel off photo paper while wet
  • Let dry
  • Etch

Comments please.
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Old 29th August 2013, 06:10 PM   #329
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I think it might be a problem to get small quantities of alu/mylar.
I will try to make my own like Solhaga suggested:
Apply the 74 tape to the alu/paper on the alu side.
Remove the paper.
Transfer print using photopaper and laminator.
Remove paper using Cold Water.
Etch .

Bernt.
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Old 29th August 2013, 06:22 PM   #330
solhaga is offline solhaga  Sweden
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Why not apply the 74 tape AFTER the laminator?
Do you reckon that the matte side is better suited?
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