[Jewelry making - Article 00183] - Re: [Orchid] Set of Burs

[John Donivan]

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>     Why is the ball bur so valuable? 

    Marking holes where a center punch won't do. Reaming, Deburring.
    Hollowing the insides of a ring. Roughing out channel settings.
    Making the dish shapes under diamond settings. Opening up holes and
    settings to calibrated sizes before setting. Texturing. Removing 
large
    areas of wax. Lowering the background in carving. Solder removal. Can
    be used as a saw in a blind space (where a sawblade won't get
    through), though I'd use a cone-square. To lay out calibrated stones,
    I mark it generally, and then get ball burs - large, medium, small,
    smallest. That's all that comes to mind - I could come up with more
    if I thought about it. General grinding of all kinds. They cut in
    every direction, don't leave edge marks like a straight bur will, are
    aggressive and fast. I'll use a ball bur to punch out a square-ish
    hole as far as I can, and then just used edged burs or files to
    detail. Think "Router Bit". Use the biggest one you can, but not too
    big, of course, to avoid "trail" marks. As in, for solder removal
    I'll use a 10mm burr, not 2mm. Also, to cut a channel, use a bur
    thats like 1/2 the width just to lower the center, then push the
    lines back to finish. 

http://www.donivanandmaggiora.com
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