[Jewelry making - Article 00769] - Re: [Orchid] Setting up a casting studio

[Jeff Simkins]

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>     The high vacuum pumps are exotic finicky beasts and their proper
>     operation takes a skilled technician. This requirement puts them
>     more in the realm of folks producing aerospace or medical parts
>     rather than jewelry. 

    High vacuum pumps are exotic finicky beasts except for the diffusion
    pump, which has no moving parts, no expensive electronic controller,
    and runs like your coffee brewer. 

    Like anything else, you can complicate it by adding a water cooled
    chevron baffle, a liquid nitrogen trap, and a high vacuum gate valve. 


    They are a laboratory standby while the other pump (cryogenic pump or
    turbomolecular pump) is being repaired by the skilled technician. :)

Jeff Simkins
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