[Jewelry making - Article 00460] - Re: [Orchid] Drilling investigated

[John Donivan]

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>     The best method to enlarge drilled holes (it you want to keep the
>     holes round that is) is by "step drilling" the holes with
>     increasingly larger drills until you reach the desired holes
>     diameter. 

    All of the thoughts on this thread are true and fine, including the
    above. On a more technical level, just FYI - the BEST method to
    enlarge holes with precision both in size and concentricity is by
    reaming. That can be done either with an official reamer (or broach)
    or by using burs at the bench. This just FYI, as most of us can do
    fine by using drills most of the time. If you need a perfectly round
    hole, though, use a reamer or similar. 

http://www.donivanandmaggiora.com
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