[Jewelry making - Article 01390] - Re: [Orchid] Casting challenge

[Tim Blades]

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    I do a similar thing in making silver beads but if I have to go over
    about 12 mm in length (with a 1.6mm hole I make very small holes
    through the pattern in pairs opposite each other to support the
    core. 

    The other thing you can try is using pencil lead if you can find some
    the right diameter and not made with a modern plastic binder, you
    need the old fashioned clay type. 

    Also make sure that you pour in line with the core and maybe use a
    double sprue so that the metal does not push it sideways. I have
    done 25mm long holes  1.6mm wide so far! Tim Blades. 



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