[Jewelry making - Article 00505] - Re: [Orchid] Rolling Mill Decisions

[Andrea Hill]

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    Durston vs. Cavallin rolling mills Warren Allen has made a very
    logical analyzes of the two rolling mills he compared and I agree
    with every point save one. The diameter of the roll is a trade off. A
    larger diameter may seem like it is better because it would have less
    deflection when stressed and I suppose this is the logic that Mr.
    Warren was following and assuming that the material has the same
    strength that is a true assumption. The advantage to a smaller
    diameter roll is you can roll a thinner gauge metal with it. The
    smaller the diameter the thinner you can roll and the larger the roll
    diameter gets the greater the minimum thickness you can achieve. The
    problem with deflection is the rolled material can come out thicker
    in the center and thinner at both edges. There is a way to have your
    cake and eat it too. Not all steel has the same yield strength, so by
    using stronger material (more costly) a smaller roll can give the
    small contact area that allows thinner rolled material and at the
    same time not flex anymore than the thicker weaker material.  Now
    you get the bonus: the stronger steel is also tougher and in my
    experience the Durston rolls keep their finish much better than any
    rolls anywhere close to the price. Simply put, Durston gives the best
    value for your money. I feel confident that Mr. Warren will have a
    lifetime of satisfaction and I very much appreciate his business and
    the kind words he posted. 

Eddie Bell
Technical Director
Rio Grande


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