[Jewelry making - Article 00138] - Re: [Orchid] Rolling Mill Problems aligning the rollers

[Robert Powell]

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    To check your rolling mill without wasting valuable  metal, get two
    straight pieces of clean unblemished copper wire. 12 gauge solid is
    good. Cut the wires 4 in. long. 

    Set your mill for a substantial, though not excessive reduction .
    Start both the wire strips at the same time, one on each side, close
    to the outsides.  Roll normally, do not back up. If the roll is in
    alignment vertically, a good micrometer or calipers, should show both
    wires reduced the same amount . Measure several times . Do not mix up
    the wires The smallest difference is the most desirable and is the
    closest to perfect alignment . We are looking for measurements in
    1/000's  of an inch. Closer the better. 

    The rolls ( I have seen ) run in bronze bushings. These rollers need
    to be subject to the same forces when testing as they would be when
    being normally used . Keep adjusting the left and right geared
    wheels. Keep checking and adjusting as needed. Copper wire is cheep
    . MAKE NOTES, DRAW PICTURES IF NEEDED. 

    After you are finished, roll the metal and take turns rolling right
    side up, and then up side down . Do not swap ends as I have heard this
    can adversely affect the quality of the sheet. 

    This should equalize any curvature left . 

ROBB

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