[Jewelry making - Article 00297] - Re: [Orchid] Set of Burs

[richard hart]

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>     I don't see why it would make any sense to try to do a tube
>     setting with a ball bur.

    I believe John was talking about using ball burrs for general metal
    work, not for stone setting. For a tube setting, after I burr with
    the correct size hart (156c) burr, if I need to thin the inside wall
    of a 14 kt tube setting, I use a diamond ball burr (metal if I don't
    have a diamond burr the right size), I ride the burr on the stone
    seat very carefully to not cut down, and gently carve into the wall
    leaving the top inside edge of the wall untouched. If you do this,
    you have to be very careful to be gentle, and not take away much
    material, and when you polish you have to be careful to not take
    material away on the outside or you expose the girdle of the stone. 

    This makes it easy to use 14 kt white or yellow gold tube settings. I
    can usually use a bezel roller, I modified one and make a grove
    length wise across the face of the roller, centered. This can be used
    for bezels for cabs or faceted gems. 

Richard Hart
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