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Old 18th April 2013, 10:21 PM   #71
solhaga is offline solhaga  Sweden
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Join Date: Jun 2009
Location: Värsta Götaland
Well the double knife didn´t work out.
But I can fairly easy make cuts 3 mm apart with a single knife using the same rods I used when I built the motor; they are 3 mm by 10 mm.
So I have the spacers for doing two 3 mm parallell cuts, 10 mm apart.

@båndsei: After wetting the paper, does one only carefully peel it off?
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Old 19th April 2013, 12:42 PM   #72
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I make half of the cuts and tape them ,cut the rest ,tape them and peel the taped alu/paper off the cutting plate,powder the alu side,wipe the rest of the powder away.
Place the 3m tape with the adhesive up,and place careful the taped alu/paper with paper up.
Rub careful,turn it over and rub again from the other side.
I go to the kitchen and pour a little water in the zink,ad a little dishwash soap and pce the diaphragm with the paper down,wait a minute ,turn it over and the paper and microporre tape is easy peeled off,in one piece.
[IMG]Click the image to open in full size.[/IMG]

Bernt

Last edited by båndsei; 19th April 2013 at 12:47 PM.
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Old 19th April 2013, 01:37 PM   #73
solhaga is offline solhaga  Sweden
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Join Date: Jun 2009
Location: Värsta Götaland
Ok, thanks.
I think that I have to be a little bit more patient then before I peel the paper off.
I will have to do it in the shower as my zink isn´t large enough for my membrane (600x160).
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Old 19th April 2013, 03:23 PM   #74
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You can use the kitchen table.It just have to be wet,not soaked.

Bernt
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Old 19th April 2013, 03:37 PM   #75
solhaga is offline solhaga  Sweden
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Join Date: Jun 2009
Location: Värsta Götaland
Yes, that works well.
It was the soap that was missing.
Now the papers peels more in one piece or at least fewer pieces.
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Old 20th April 2013, 07:49 AM   #76
solhaga is offline solhaga  Sweden
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Join Date: Jun 2009
Location: Värsta Götaland
Default Conclusion

I will try to follow this scheme:
  1. Cut between inner left and outer right
  2. Cut between outer left and inner right
  3. Repeat 1 and 2 until finished
  4. Lift up membrane and put it away (membrane is still in one piece)
  5. Powder the cutting table
  6. Place the membrane with paper side down on the cutting table (no need to wipe excessive powder away)
  7. Apply film (the film is applied and not a delicate membrane.)
  8. Flip membrane (paper side up)
  9. Cut out membrane along membrane left and right
  10. Remove paper with water and
  11. Place the membrane with film down (optional)
  12. Apply threads (optional)
  13. Apply film (optional)
  14. Fold and bake

I think that this scheme is safer but I will be grateful for any caveat.
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Old 20th April 2013, 09:11 AM   #77
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Join Date: Dec 2008
You dont mention taping ?
First, I tape the alu/paper to the cutting plate at all sides.
Powder has to be on the alu side to make the tape placed on the cuttings less sticky.
I cut all left-right tape them, turn and cut all left right tape them.
If you look at my pictures you might see it.

Bernt
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Old 20th April 2013, 09:23 AM   #78
solhaga is offline solhaga  Sweden
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Join Date: Jun 2009
Location: Värsta Götaland
The membrane is taped to the glass during 1 and 2 and when applying the film.
The powder in 5 is for to be able to easier pull the film off the glass, but it might not be needed.

Here´s a picture after the first couple of cuts:
Attached Images
File Type: jpg 2013_04_20-599.jpg (636.4 KB, 338 views)
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Old 20th April 2013, 10:16 AM   #79
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Join Date: Dec 2008
I think i see your idea.It is not the same way i do it.
You say film,do you meen 3m tape?
I think it will be wery difficult to aply the film to the cutted alu/paper.
I apply the cutted, taped and powderet alu/tape to the 3m tape,wich is taped to table or cutting plate.
The 3m tape gets electric charged and wery difficult to handle.
The cutted taped and powderet, I use, is easier to handle.
Try a small scale test!

Bernt

Looks good
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Old 20th April 2013, 10:29 AM   #80
solhaga is offline solhaga  Sweden
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Join Date: Jun 2009
Location: Värsta Götaland
You pin pointed the dilemma I will be facing: film to membrane or membrane to film.
I think it is a higher risk with the latter as the membrane is quite large.
I´m used to the film to membrane technique since when I made my ribbons.

Yes, film = 3M 74 tape.

Small scale test? I don´t think so.
Small scale test = small scale problem.
Real scale test = real scale problem.
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