[RASMB] Oil where it shouldn't be

[Arthur Rowe]

Greetings Holger and everyone -

The problem with oil in the XL-I/A is a notorious and intractable one.
Having a turbo pump instead of that horrible 'straight through, unvalved' DP
system sounds very easy to do, and I have long contemplated doing it. After
all, you can get compatible flanges, I am sure. And as a long-time electron
microscopist and builder of ancillary equipment I just shudder at the
crudity of AUC vacuum systems.

However - such discussions as I have had with Beckman people suggest that
this approach (using a turbo) would help but not really solve the oil
problem, which is at least partially due to oil from the drive shaft of the
motor, not just to oil from blowback from the DP.

Depressing. Any more bright ideas out there?

Arthur
-- 
*************************
Arthur Rowe
Lab at Sutton Bonington
tel: +44 115 951 6156
fax: +44 115 951 6157
*************************





Hello everybody,

there is the well-known problem of diffusion pump oil condensing on the
lens of the interference optics at low run temperatures. I would like to
hear what others have done about it - I

- have greased the thread of the filter which sits on top of the lens with
vacuum grease; some improvement, but not really (sometimes, the oil
condensed on top of the filter).
- have applied some diffusion pump oil to the lens, but it's too
viscous, so it crept just to the point where the filter is closest to the
lens, fringe pattern looking, ahm, psychedelic at points. Which made me
think, that maybe by applying more and forming a continuous layer of oil,
the problem could be solved?

Finally, has anyone tried to run a turbomolecular pump with the
centrifuge? 

Cheers, Holger

- - - - - - - - - - - - - - - - - - - - - - - - - - - - -

Holger Strauss 

Forschungsinstitut fuer Molekulare Pharmakologie (FMP)
Robert-Roessle Strasse 10

13125 Berlin/Germany

Tel: +49 (0)30 94793 - 223 (office)
                    - 316 (lab)

Fax: +49 (0)30 94793 - 169


- - - - - - - - - - - - - - - - - - - - - - - - - - - - -

Science is spectrum analysis; art is photosynthesis.

                                                   Karl Kraus

_______________________________________________
RASMB mailing list
RASMB at rasmb-email.bbri.org
http://rasmb-email.bbri.org/mailman/listinfo/rasmb


-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://list.rasmb.org/pipermail/rasmb-rasmb.org/attachments/20040407/cd32efaa/attachment.htm>