[Jewelry making - Article 00075] - Re: [Orchid][Source] Vacuum casters

[Byzoque]

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>     I  want to buy a vacuum caster and need help deciding  what kind
>     to get

    Hi Alma, In response to your question about buying an all in one
    casting machine, those are not a bad deal but you can get the same
    results without spending that much money.  Don't rule out that
    second hand pump and second hand table.  If you have a used vacuum
    pump that pulls 27-29 inches, you will get good castings. 

    Having one table just means that you will have to change the rubber
    investing pad and the silicone casting pad depending on whether you
    are investing or casting.  Not hard.  One of the drawbacks of the
    all in one casting machine is changing the oil.  I use an oil-less
    vacuum pump.  The side draw bell jars help prevent investment from
    clogging up the hoses.  If you're careful, a regular bell jar should
    be fine. 

    If you're going to use an Electromelt, I would spend a little extra
    and get an automatic, rather than a manual.  This will save you lots
    of aggravation.  Pinch your pennies on the casting machine, spend
    them on the Electromelt. 

    The Neycraft fusing problem is caused by not weighing the metal
    accurately.  When there is too much metal it sticks the crucible to
    the flask and you get sculpture.  If you're using the Electromelt to
    do spincasting, make sure you preheat your crucible.  The graphite
    crucible in the electromelt deteriorates when exposed to air, so if
    you're doing small batches, you'll be going through lots of
    crucibles.  It's better for vacuum casting where you pour one right
    after another. 

    Dana Carlson  

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