[Jewelry making - Article 00273] - Re: [Orchid] Drilling holes in pearls

[John Donivan]

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>     I've always thought that the spade type of pearl bit was used to
>     seat half pearls (cabochons, if you will) in settings such as
>     around 

    Well, ya learn something every day. I never used pearl drills,
    though we have some knocking around, and I always wondered about the
    size of them, as Andy points out. That operation is called
    "counterboring" in machinery, done with counterbores, of course.
    When you look at some machine and it has a rounded case or body, and
    all the bolts have a nice flat, round seat cut for them, that's
    counterboring - countersinking is for a tapered screw head. And
    counterbores look like pearl drills, too, in general. Maybe Andy is
    actually wrong, but it answers a lot of questions, like why would
    you want a 3mm pearl drill? Flattening pearl bottoms is not really
    the same, but the action of the tool is - key into the hole and then
    cut a flat spot around it.....TYVM.. 

http://www.donivanandmaggiora.com
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