[Jewelry making - Article 00427] - Re: [Orchid] Delft casting and huge sprues

[Ron Charlotte]

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>     ...The sprues shown are HUGE. The sprue for the pendant (the second
>     casting shown), must be at least 1/2" wide! I guess that explains
>     how it is done. 

    1/2" sprue! Having never seen the video (I didn't buy the kit, I just
    use the clay in my regular sand casting flask), that sounds way
    oversize to me. It may simply be a trick of perspective. I do use a
    much larger gate than you would use for lost wax, but it's more on
    the order of 3/16" to 1/4" (small drink straw size), but a 1/2 inch
    is something I might use to feed a multi-item casting in a very
    large flask. 

    On smaller castings, I've regularly used a golf tee to poke a gate
    through and gotten fine castings from that. Again, I've been doing
    this with bronze, old-school sterling, and occasionally brass. 

    On a gravity pour, your _button_ needs to be at least as 2/3 the
    mass of the casting itself, some people will say equal. 

Ron Charlotte -- Gainesville, FL
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