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Old 26th January 2013, 03:34 PM   #151
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Join Date: Dec 2008
I had forgotten that measurement.Here it is:
[IMG]Click the image to open in full size.[/IMG]
Green is covered 20mm at each end.
Very small difference.
I made a test with my new tool.Plates are too thick.2mm gives a spacing off 4-5mm.,and it have to bee app.2,5mm.
The fixture with the diaphragm has to be in the oven 20min. at 175 c.
Plexiglass gets soft and bendy at that temperature.

Bernt.
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Old 30th January 2013, 05:31 PM   #152
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I have made a new diaphragm with 1mm. alu plates for the tool
[IMG]Click the image to open in full size.[/IMG]
[IMG]Click the image to open in full size.[/IMG]
It is very symetrical .And it keeps shape,meening i have to drag a bit to fit 32mm.with.

Bernt
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Old 30th January 2013, 05:51 PM   #153
solhaga is offline solhaga  Sweden
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Location: Värsta Götaland
Impressive!

So you have alufoil across to keep the shape?

Last edited by solhaga; 30th January 2013 at 05:59 PM.
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Old 30th January 2013, 06:19 PM   #154
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No.Not nesesery.The mylar keeps shape as it is warmed up and cooled again.The stripes is there because tape is double there .My tape is 50mm.wide and i use 4 to get 160mm.

Bernt
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Old 30th January 2013, 06:32 PM   #155
solhaga is offline solhaga  Sweden
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So you have 50 mm wide mylar tape? How thick?

Quote:
The mylar keeps shape as it is warmed up and cooled again.
Yes of course. That´s how it used when making wings and fuselage for air plane models. In fact, I order my mylar from a micro flight diy supplier here in Sweden.

How do you heat it up, bake the whole package in the oven?
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Old 30th January 2013, 08:18 PM   #156
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Mylar is the same as polyester or PET.My tape is 12my with 8 my adhesive.I place it all in a oven for 20min. at 175' c.

Bernt.
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Old 30th January 2013, 08:27 PM   #157
solhaga is offline solhaga  Sweden
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Thanks, Bernt.
Do you buy the tape or make it yourself?

When I saw your method I thought of nail strips. They have predrilled holes, can be down to 0,7 mm thick and can be cut in any length:

Click the image to open in full size.

Last edited by solhaga; 30th January 2013 at 08:39 PM. Reason: spelling
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Old 30th January 2013, 08:33 PM   #158
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I bought it here:Specialtape & klæbestoffer
Nail strips might do it.

Bernt
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Old 30th January 2013, 08:54 PM   #159
solhaga is offline solhaga  Sweden
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Great. I´ll check if it can be obtained in Sweden.

Looking at the site it says:
"We can supply tape in standard widths as indicated below or in widths according to specifications."
and according to the data sheet:
"Widths from 1/4” to 15.5"

So then you can have the tape oriented along with the gap and you don´t need to overlap.

Last edited by solhaga; 30th January 2013 at 08:58 PM.
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Old 31st January 2013, 08:25 AM   #160
jay53 is offline jay53  India
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Quote:
Originally Posted by båndsei View Post
Mylar is the same as polyester or PET.My tape is 12my with 8 my adhesive.I place it all in a oven for 20min. at 175' c.

Bernt.
Bernt,

This is very interesting. I just bought AMT diaphragms to build the Tweeters.

Are you using the Photoresist to develop the aluminum traces on the PET or using Aluminum adhesive backed tapes ? I presume the Mylar 3M tapes are to protect Aluminum traces.

Jayant
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