Hi Charlotte, 

As far as I understand, you mean the 4 big bolts on the outside of the source manifold. If so, I don't think they have to be stainless steel.

It's important that they are able to push the source flange with enough power to the housing so that the necessary vakuum can be achieved.



Akané Hartenbach
Department of Environmental Sciences
Institute of Biogeochemistry & Pollutant Dynamics (IBP)
Universitätstrasse 16
ETH-Zentrum, CHN, Office G14
CH-8092 Zurich

Phone :+41 (0)44 632 8361
email:   [log in to unmask]

-----Original Message-----
From: Stable Isotope Geochemistry [mailto:[log in to unmask]] On Behalf Of Charlotte Lehmann
Sent: Mittwoch, 29. August 2007 17:39
To: [log in to unmask]
Subject: [ISOGEOCHEM] Delta V ion source attachment screw

We have a Delta V. I needed to replace the filament and I am not having a lot of luck with the aluminum threads in the ion source housing this week. I have managed to strip one each on two separate occasions. Our soon to depart Physics Dept. Machinist has been able to tap out the holes and adjust the opening in the claws and washers to accept a non-SS 3/8" bolt shortened to the length of the original SS 8 mm bolt.
My question is this: do these bolts which clamp the source into the aluminum housing need to be Stainless Steel?
If so, I'll have to order some ASAP, since the machinist leaves the end of this week and I don't know when his replacement will be hired.  
The sooner I hear from anyone on the list who knows with certainty, the sooner I can get these bolts, if necessary.
Thanks in advance.
Charlotte Lehmann
Assistant in Instruction
Bates College
Department of Geology
206A Carnegie Science Building
44 Campus Avenue
Lewiston, ME 04240
Phone: 207-786-6485
FAX: 207-786-8334