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Old 4th November 2017, 05:16 PM   #21
solhaga is offline solhaga  Sweden
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Join Date: Jun 2009
Location: Värsta Götaland
Yes, the tweeter doesn't need that much space in front of or at the back of the membrane as it doesn't move that much in those directions.

I just mount the membrane closer to the front pole pieces then.
Maybe the reflections will move upwards in frequency as well.
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Old 4th November 2017, 06:44 PM   #22
solhaga is offline solhaga  Sweden
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Default Tweeter part

Something like this then:

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Membrane is not so deep and moved closer to the front pole piece.

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Yes, definitely stronger flux.

I hope I can mount it .
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Old 4th November 2017, 06:55 PM   #23
båndsei is offline båndsei  Denmark
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This was the idea.
But what is flux in the iron bars?

Bernt
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Old 4th November 2017, 06:57 PM   #24
solhaga is offline solhaga  Sweden
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Purple parts are saturated.
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Old 4th November 2017, 06:59 PM   #25
båndsei is offline båndsei  Denmark
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Nice flux in the gap,and very linear
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Old 4th November 2017, 07:40 PM   #26
solhaga is offline solhaga  Sweden
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Quote:
Originally Posted by båndsei View Post
Nice flux in the gap,and very linear
Yes, 30 % increase of the flux density is not bad.
Thank you, Bernt!
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Old 26th December 2017, 05:39 PM   #27
solhaga is offline solhaga  Sweden
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Finally got my 3D-printer, Prusa i3 Mk3, a couple of days before christmas:

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It took 1 hour and 53 minutes to print 2 cm of one side of SLAM!.
So the building rate is 0,5 cm an hour.
ABS filament at 0,2 mm height and 20 % fill.

I guess it will take a couple of iterations before I am satisfied with design.
One huge advantage with this building practice is that a smooth front can be made with any diffractional edges.

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But this is not the case yet.
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Old 1st January 2018, 09:57 PM   #28
solhaga is offline solhaga  Sweden
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Join Date: Jun 2009
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Some iterations later:

Click the image to open in full size.

Front:

Click the image to open in full size.

Back, with room for the back pole pieces that will be mounted after the membrane:

Click the image to open in full size.

As you can see prototype is armed, the magnets will be glued to the side parts in the series specimens.
And the plastics will be black; it was a little easier to evaluate the prototypes using white.
A rim has been added for the membrane holder. Usable gap is now 60 mm.
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Old 3rd January 2018, 06:05 PM   #29
solhaga is offline solhaga  Sweden
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Join Date: Jun 2009
Location: Värsta Götaland
I test mounted the first series segments in the frame:

Click the image to open in full size.

The segments are be inserted in the cut outs at the top and then pushed down to the already mounted segments.
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Old 6th January 2018, 04:43 PM   #30
solhaga is offline solhaga  Sweden
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Jig for four segments during hardening:

Click the image to open in full size.

With four segment and some Loctite Power Epoxy:

Click the image to open in full size.

Close up:

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The block in the gap as 66 mm and pushes the magnets during the hardening.
They actually stay there without glue, but vibrations can make them wander and then its - kaboom!
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