[Jewelry making - Article 00170] - Re: [Orchid] Vacuum casting vs. centrifugal casting

[Jeffrey Everett]

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>     I do believe that the molecular density may be slightly more
>     compact with Centrifugal, but have no scientific data to back that
>     statement. 

    According to tests published from the Rio Grande seminars, vacuum
    casting produces denser casting. 

    I also use both centrifugal and vacuum, with the preference to
    vacuum. I use centrifugal casting for sluggish metals such as some
    white golds. I find the quality of vacuum cast pieces to be of better
    quality. The metals enters the flask with far less pressure so there
    is less stress on the investment, and with less turbulence so there
    is far less entrapped gas. The vacuum assist also helps oxygen given
    off by the solidifying metals to leave the cavity. I find vacuum
    assisted casting to have better surface finish and less porosity. Of
    course melting technique along with the alloys used will always
    impact the quality of the castings. 

Jeffrey Everett

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