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9462Re: Unusual upset on a nickel planchet

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  • Mike Diamond
    Sep 7, 2005
      One thing I'd like to understand about planchets such as the one you
      pulled out is exactly how such a wide, high proto-rim is produced. It
      would seem that more than simple squeezing and rolling is involved. It
      looks almost as if the two faces are clamped between two flat cylinders
      as a slightly wider perimeter is squeezed and rolled. Otherwise, does
      one explain the abrupt junction between inner border of the proto-rim
      and the flat surface?

      Does anyone out there have a clue?
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