[Jewelry making - Article 01219] - Re: [Orchid] Making a Threaded Cap

[David L. Huffman]

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Hi Beth;

>     I'm looking for some instructions on how to make a threaded,
>     screw-on cap (I'll be using sterling silver). 

    There is a way to fabricate one of these, I think Charles
    Lewton-Brain had shown a method, but I don't know if it's in any of
    his books. I have another way you could try. Find a plastic container
    with a screw on top, as in a toothpaste tube and cap, or a small
    plastic bottle, etc. You cut off the male threaded part, and sprue up
    that and the cap and burn them out and cast them. Fabricating them
    involves wrapping a double piece of wire around a mandrel and then
    unscrewing them into two separate coils. You then need two tubes, one
    with an inside diameter that the coil will slip into, the other with
    an outside diameter that a coil slip over. But the wire thickness has
    to just make up the difference. The coils are soldered onto their
    respective tubes, and the larger tube capped off. You calculate the
    sizes by finding a pair of tubes first, one with an inside diameter
    about a millimeter or two larger than the outside diameter of the
    other. When you find two tubes appropriately related as such, and
    which are pretty much the size of the cap you're interested in
    making, then you use wire that will, when wrapped around the smaller
    tube, fill the distance between the two. Clear as mud, right?
    Hopefully, someone on this forum will have a reference with
    illustrations and better explanation. 

David L. Huffman
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