[Jewelry making - Article 00360] - Re: [Orchid] Otto Frei's Economy Rolling Mill

[James Binnion]

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Hi Helen,

>     I was warned not to buy a rolling mill from India as they don't
>     tend to use hardened steel in their tools, but one of the specs of
>     this mill was a decent Rockwell hardness figure of 80-82 for the
>     rollers. 

    Which Rockwell scale A, B, C or one of the others ? The typical
    scale for rating hard steels is the Rockwell C scale. Steel does not
    reach a hardness of 80-82 RC It tops out in the 60s for high hardness
    tool steels. So either this was a misprint or misrepresentation. 

Jim

James Binnion
jbin AT mokume-gane.com
James Binnion Metal Arts
http://www.mokume-gane.com
360-756-6550
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