[Jewelry making - Article 01192] - Re: [Orchid] Making a Threaded Cap

[John Donivan]

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    The obvious way to make a threaded cap is to use tap and die, or turn
    threads on a lathe. The problem with tap and die is that it doesn't
    work, or work very well, on sheet metal - it deforms it before the
    threads are cut. But, if it's viable for you, that's the best and
    easiest way - maybe even a pipe tap. You can make a solid part for
    the male threads and then drill it after, and make a stout part for
    the female and then take down the outside after to avoid the
    deformation. The old-fashioned way to make cap threads is with wire.
    Get a mandrel of the SAME size as your cap - even use the mandrel to
    make the cap. Get two pieces of silver wire, maybe 18 ga. or so. I put
    the ends of the wire against the mandrel and clamp it all in a vise.
    Then wrap the two wires around the mandrel as though you were making
    jump rings. When it's long enough and some extra, unclamp it,
    carefully take the two wires apart, solder one coil on the inside, one
    on the outside, maybe file a little to adjust and voila' - threads.

http://www.donivanandmaggiora.com
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