[Jewelry making - Article 00250] - [Orchid] Setting Burr Sizes

[Carol Carter-Wientjes]

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    Hello and happy to report success with my first tube setting
    experience after getting good Orchidian help a couple weeks ago
    finding the right tubing for the job. Metalliferous to the rescue! 

    Now onto another related question regarding setting burrs. The above
    mentioned tube setting required using a 4mm setting burr which I got
    with no problem. Decided to get a couple more (and yes, probably
    should just break down and get a good set) and discovered that while
    you can order an 4mm setting burr, any diameter smaller than that
    decreases by 0.2mm odd increments on down the line (to 1?). In other
    words, to tube set a 3mm stone which should require using a 3mm
    setting burr.....Can't seem to order that one. Is there a reason why
    individual burrs are sold like that? Not sure which one I could use
    for a 3mm stone. I'm stumped. This is where buying a set comes in
    isn't it?

Thanks as always for any helpful advice, Carol
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