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<TITLE>Re: [RASMB] Oil where it shouldn't be</TITLE>
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<BLOCKQUOTE><FONT COLOR="#800000">Greetings Holger and everyone -<BR>
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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. <BR>
<BR>
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, <I>not</I> just to oil from blowback from the DP.<BR>
<BR>
Depressing. Any more bright ideas out there?<BR>
<BR>
Arthur<BR>
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*************************<BR>
Arthur Rowe<BR>
Lab at Sutton Bonington<BR>
tel: +44 115 951 6156<BR>
fax: +44 115 951 6157<BR>
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Hello everybody,<BR>
<BR>
there is the well-known problem of diffusion pump oil condensing on the<BR>
lens of the interference optics at low run temperatures. I would like to<BR>
hear what others have done about it - I<BR>
<BR>
- have greased the thread of the filter which sits on top of the lens with<BR>
vacuum grease; some improvement, but not really (sometimes, the oil<BR>
condensed on top of the filter).<BR>
- have applied some diffusion pump oil to the lens, but it's too<BR>
viscous, so it crept just to the point where the filter is closest to the<BR>
lens, fringe pattern looking, ahm, psychedelic at points. Which made me<BR>
think, that maybe by applying more and forming a continuous layer of oil,<BR>
the problem could be solved?<BR>
<BR>
Finally, has anyone tried to run a turbomolecular pump with the<BR>
centrifuge? <BR>
<BR>
Cheers, Holger<BR>
<BR>
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Holger Strauss <BR>
<BR>
Forschungsinstitut fuer Molekulare Pharmakologie (FMP)<BR>
Robert-Roessle Strasse 10<BR>
<BR>
13125 Berlin/Germany<BR>
<BR>
Tel: +49 (0)30 94793 - 223 (office)<BR>
- 316 (lab)<BR>
<BR>
Fax: +49 (0)30 94793 - 169 <BR>
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<BR>
Science is spectrum analysis; art is photosynthesis.<BR>
<BR>
Karl Kraus<BR>
<BR>
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