Hi to all
My experience has been the same with Ken, and I am still waiting for parts
paid last june !
I wonder if all users of Heines's furnaces could put up a groupped order
(at Thermoshield for example) in order to try to have lower prices for
heating filaments and crucibles if we order "plenty" of them (I have no
idea how many "plenty" would mean)...
How does that sound ?
Nick
At 14:18 16/11/2005 -0800, Martin S. Wong wrote:
>Hi all,
>Our experience at UC Santa Barbara has been the same with regards to Ken
>Heine, so we've looked for other resources. We recently had a coiled
>heater element that sagged and contacted the heat shield, melting part of
>it. A company called Thermosheild in Palo Alto, CA, was able to provide
>new furnace sheilding based on our measurements of the Heine furnace
>design. Although I'm not at Santa Barbara now, reports are that the new
>heat shielding was of superior design to the Heine version. Contact info
>for thermoshield is:
>Thermo Shield
>722 Orange Avenue
>Los Altos, CA 94022-3849
>ph: 650-941-5230
>fax: 650-941-2568
>e-mail: [log in to unmask]
>Main contact: Bernard Scheiff, [log in to unmask]
>http://www.thermoshld.com/
>
>Thermoshield also was able to provide moly tubing for fabrication of moly
>crucibles. The moly tubing was about $330 from thermoshield for
>appropriate length and gauge. We had our crucibles fabricated by Applied
>Fusion (at Andy Calvert's suggestion from USGS in Menlo), which cost
>another $375 per crucible (so total cost was about $700 per crucible if
>bought in reasonable numbers and the moly crucibles seem to last longer
>than the Niobium ones). Their contact info is:
>Applied Fusion
>1915 Republic Avenue
>San Leandro, CA 94577
>ph: 510-351-8314
>fax: 510-351-0692
>[log in to unmask]
>Ron Musgrove - CEO
>Ron Holton - VP Fabrication
>http://www.appliedfusioninc.com/
>
>Dave - in response to your question on thermocouples, we had a custom
>thermocouple made by our physics machine shop which consisted of an Omega
>unsheathed fine gauged type C thermocouple that comes with a bead at the
>top (T5R and T3R series). The bare wires can be fed through a standard
>2-hole ceramic thermocouple insulator, also available from Omega. We then
>designed a teflon cylinder with a blind hole drilled into the top designed
>to hold the thermocouple insulator. The blind hole had small holes in
>either side to feed the thermcouple wires through the blind hole to the
>outside of the cylinder. The teflon cylinder is slotted at the base to
>fit into a standard conflat flange electrical feedthrough. We put small
>set screws into the electrical contacts to attach the thermocouple wires
>into each feedthrough and covered the teflon base with shrink wrap to
>avoid having the thermocouple wires touching anything. If the
>thermocouple breaks, you can just swap out the beaded wire, which is a
>stock item from Omege for about $60-$80, which is much cheaper than what
>Heine was charging for repairs and with a faster turnaround time. It
>sounds a bit more complicated than it actually is. I can have someone
>take some photos if you are interested.
>
>Hope this is helpful.
>
>Cheers,
>Martin
>
>--
>Martin Wong [log in to unmask]
>Graduate Student www.uweb.ucsb.edu/~mwong
>Dept. of Geological Sciences Phone: (805)893-2782
>UC Santa Barbara Fax: (805)893-2314
>Santa Barbara, CA 93106
>
>Current contact info:
>Visiting Assistant Professor
>Department of Geology Colgate University 13 Oak Drive Hamilton, NY 13346
>
>Ph 315/228-7203 Fax 315/228-7187 [log in to unmask]
*********************************************
Dr Nicolas ARNAUD, PhD
Chargé de recherche CNRS
Directeur de la Fédération de Recherche 2035-ISTEEM
UMR 5573 CNRS, Laboratoire de Dynamique de la Lithosphère (LDL).
Groupe de Géochronologie
CC 066
I S T E E M - U S T L
Place Eugène Bataillon
34095 Montpellier Cedex 5
FRANCE
Tel: (33 0) 467143729
Fax: (33 0) 467143729
[log in to unmask]
___________________________________________
|