[Jewelry making - Article 01525] - [Orchid] Memco Casting Machines

[D. Bright]

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    I just recently purchased a Memco Electro Vac Casting machine.  This
    is not the machine that I really wanted but the deal on it was just
    too good to pass up.  The machine that I found had only 26 casts on
    it, and the price was even better.  I bought it to replace a 25 year
    old Galloni when it finally dies or I can no longer get parts.
    (which according to Galloni should be soon) 

    I plan on doing 3 inch flasks with this machine and small casts
    consisting of 1 to 10 pieces per flask.  I realize that most people
    think of this machine as a large object casting machine. 

    Does anyone have any experience with this machine?   Would you mind
    if I called you to ask some questions? 

    I need to know about Memco's suggested casting temps and flask
    temps.  I currently use a low flask temp when I use my Galloni.  I
    cast yellow gold with the flask temp as low as 650 to 750.  If I do
    white gold I cast with the flask temp at about 750-800.  This seems
    to do well for my current setup.  I am using a casting temp for the
    metal of around 950 C.  I am curious as to how this will do with
    vacuum casting.  I am unsure of what effect the vacuum will have on
    cooling the flask and how fast this will occur.  When I use my
    centrifical setup the flask only sits in the machine for less than a
    minute before I cast.  I have been getting excellent results with
    what I have been doing. 

    With the vacuum the flask should only sit for about a minute or
    less...but it will be having air drawn through/around the flask by
    the vacuum pump.  How much do I compensate for this? 

Thank you,
David

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