[Jewelry making - Article 00328] - Re: [Orchid] Drawing down tubing

[Neilthejeweler]

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    half a mm would not be as problematic if you're dealing with say, 8
    mm tubing. As the tubing gets smaller a half mm becomes a bigger
    step, percentage wise. 

    Do you have a taper leading to the hole? Is it polished? Loupe the
    hole and you might see tooling marks. To get rid of them reciprocate
    your cutting/polishing tool while its turning at low speed. The idea
    is to make the polishing lines NOT concentric with the hole. Think of
    the way an automotive cylinder is honed to make a crosshatch pattern.
    Each little groove is another source of friction. Your life will go
    easier if you lubricate in some fashion, which can easily be cleaned
    off before soldering. Anneal as required.
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