[RASMB] 3mm cell

[Ariel Lustig]

Dear Borries ,dear colleagues,
I allready work with thin doublesector cells 2, 3 and 4mm longtime with the  E and XLA, before Beckman 
put the 3mm on the selling list.  Our workshop made /cut from a bad  12 mm Charcoal-Epoxy or Alum-Epoxy (not Kel-F or Alum !) Centerpiece 1 or two good new thin ones. Depends on the  size .Also the 2 spacers, the simplest thing , adapted to each size. To prevent  leaks  (not always  happen) I add from each side  a  DS red washer as used with the 12mm Alum standart centerpiece. A little problematic
is to assemble the cell because they  are flat and no place where  the washers can be fixed.
First  I insert  the lower windowholder+saphire then I insert  the lower  washer on the window by eye
you can use a wooden thin road(long match) to move better in position and you insert the centerpiece,
if the washer does not lie perfect, push  from below with  a steak and cleaning paper  so a bit space to push  the washer remain, to lie the upper washer on the centerpiece is easy. Apro-pos. Also for leaking 
12mm Epon centerpieces  I add washers.
As the source of many leaks are  the screw-washer (evaporation) especially older once  I add from them 
3-5 under each screw. In case of thin centerpieces it is crucial. 
The DS washers are quite expensive and I use them several times.
Optical focus of the Xla is in the cell mid From my knowladge , not on 2/3 level .
Mostly I use 4mm , the 2mm are difficult to assemble. I run thin cells up to 44000 rpm if needed
but usually less for SE.

Meanwhile I restarted working on private  base not as member of the Biozuntrum Basel.

Borris, sorry that in my situation now I can't help directly, I have no influence on the workshop there
but to make a spacer  is about 10 minutes a centerpiece 1/2hour. with washers no smoothing 
proccedure needed.
 yours ...ariel
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