[Jewelry making - Article 00199] - Re: [Orchid] [Source] Opal cylinder

[Stan McCall]

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Hello Kevin

    If your piece of rough is large enough you could use a core drill
    with the inside diameter about equal to the size you need and use
    the core. 

    Another option would be if you have a faceting machine is to set up
    the rough parallel to the lap and set your index to freely spin,
    keep lowering the mast until you create the round cylinder in the
    thickness that you need. 

    The method I use is to hold the rough between your index fingers and
    spin with your thumbs, count 1-2-3 while grinding then spin 1/4
    turn. beats your fingers up a bit, but it's fast and no worries
    about coming off the dop. 

    Once the pieces are roughed out take a nail with a good head and
    insert it into the flexshaft. spin and file down the head of the
    nail to the diameter you need, then epoxy the cylinder to the head
    of the nail. after a good cure, insert the nail into the flexshaft
    and spin while sanding with wet/dry sandpaper in the usual sequence.
    Then polish, I use french cerium on leather 

Hope this helps

Stan McCall
Custom Creative Gem Cutting
http://home.earthlink.net/~custom-creative
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