[Jewelry making - Article 01158] - Re: [Orchid] Casting small round bars

[James Binnion]

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>         Many people forge the ingot in the beginning. I use the
>     rolling mill to bring the round ingot square and anneal. I believe
>     that this serves the same purpose. Works well for me, anyway. 

    Hi Bruce, 	The reason for forging rather than rolling is that the
    rolling mill tends to not have full penetration of force. That is
    that the rolling action mostly works the metal on the outside of the
    bar and not the inside you can see this by looking at the end of a
    piece run through the mill you will see that it develops a concave
    surface. The outside of the bar is pulling the inside along with it
    but at a slower rate. If you forge with an appropriate hammer size
    the end of the bar will be convex indicating a full penetration of
    force. The difference is that the crystals in the bar will be worked
    more uniformly by forging rather than rolling and this can save your
    bar from some internal cracking further on down the road in the
    fabricating process. FWIW 

    Jim Binnion James Binnion Metal Arts Phone (360) 756-6550 Toll Free
    (877) 408 7287 Fax (360) 756-2160 http://www.mokume-gane.com
    jbin AT mokume-gane.com Member of the Better Business Bureau


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