[Jewelry making - Article 00513] - Re: [Orchid] Drilling investigated

[leonid surpin]

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>     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. 

    Here I go again with my ancient ways, but I suggest that is should
    be tried at least once. 

    Problem with drilling is that drilling is done the best at low
    speeds and moderate pressure, almost impossible to achieve with small
    diameter drills using flex shaft. 

    Using reamers is an industrial technique. They are very expensive
    and not easily adaptable for jewellery. 

    Broaches, even cutting variety, are better suited for polishing
    inside the hole. They term "cutting" only makes sense from watchmaker
    point of view. They do not remove much metal. 

    The problem was always solved by using jewelers saw with 8.0 blade.
    Whatever inaccuracies that may arise out of this approach are
    diminishing with practice and easily corrected when bearing is cut. 

Leonid Surpin.
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