[Jewelry making - Article 00365] - Re: [Orchid] Setting Burr Sizes

[Eric McCafferty]

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    I am sure someone will come out with the exact reason for the sizes,
    but it seems that the burs are made to the more common stone cutting
    sizes. In a lot of our rings I use diamonds that are cut to 1.6mm and
    1.8mm. That means I have to use a 1.5mm burr and carefully "enlarge"
    the hole. Basically I cut the seat to depth, then rotate the bur in a
    circular motion to make the hole bigger, does this make sense?
    Another thing that will help, start the hole with a bud bur, which
    will be slightly larger than the finished size, giving the opening a
    little taper, cut the bottom seat, then rotate the bur. Remember
    though, better to cut a little, then have to cut a little more, than
    to cut away to much, so gently open the hole. 

    Hope this helps. 

Thank You,
Eric McCafferty
Studio311.com
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