[Jewelry making - Article 00383] - Re: [Orchid] [Source] Opal cylinder

[Kevin P. Kelly]

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>     In the case of small diameter mineral rods, I strongly suggest tube
>     "potting" to provide a quite round starting object, rather than
>     multi-faceting by hand or otherwise. Vibration due to spinning an
>     out of round starting object on the work-rest will cause fractures.
>     We use an electronic potting grade of epoxy, as it has very low
>     viscosity (releases bubbles readily), a low exotherm (does not do
>     heat damage) and grinds away to dust, without gumming whatsoever. 

    You've convinced me of the wisdom of 'tube potting'. Dreadful work
    can be produced using the most precise equipment. I find it
    interesting that although I use mm gages and a 'Leveridge' gage I
    finally rely on eyeballing as the final judge. Thanks again for the
    helpful advice. 

KPK
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