[Jewelry making - Article 00133] - [Orchid] Investment inside casting pieces

[marco]

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Hello,

    I have encounter a problem to which I can't figure out how to solve
    it. I have a casting induction/centrifudge machine with a vacuum and
    argon connection. On occations we cast pieces that once almost
    finished we find that they have rather large cavities that contain
    investment init. These cavities are not visible at first, they
    appear as small minute holes, such as porousity. In an attempt to
    close this porous with our laser machine we encounter that behind
    that little hole lies a big space with investment. 

    I follow the investment quantities and burnout times to exact
    precision.I have regulated the vacuum to only do -250 and the speed
    of the centrifudge reduced to a bare minimun, but every now and then
    we still have this issue? Has anyone encountered this problem, or
    have any suggestions?
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