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Re: [Orchid] Hot Mix Investment for High Altitude Casting
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Martin James Tuesday, February 22, 2005
   
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    In our shop (elevation 7000 feet) we use an investment mixer which
    pulls a vacuum prior to mixing the water with the investment. The
    investment water mix remains under vacuum for the entire
    mixing/pouring/vibrating time period. After mixing, the investment
    is poured into the flask which is also under the vacuum.  The
    investment does not foam at all. No precautions for flask overflow
    are necessary. The results are excellent, and a major improvement
    over the traditional system. Also worth noting is that using an
    investment mixer greatly reduces the exposure to airborne investment
    dust, a major health hazard in many shops. 

    Our machine which is no longer sold by Rio Grande, is the Saint Louis
    Mixer, single model, Cost us$1200, Mfg by the same company that
    distributes Kerr products in Italy. A picture of their 3 flask model
    is in the Kerr Satan Cast 20 mixing instruction booklet. 

Cheers Martin


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