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<p>[QUOTE=&quot;Conder101, post: 1447832, member: 66&quot;]That is called a galvano.&nbsp; The original design was made either using modeling clay or sometimes plaster.&nbsp; From that a negative casting was done in plaster and the negative was then heavily electroplated.&nbsp; Sometimes just with copper, sometimes with layers of copper and nickel for strength.&nbsp; The thickness of the plating would be built up enough that the metal shell could support itself.&nbsp; the inside of the galvano would then be filled with plaster for additional support.&nbsp; This oversized metal shell would then be used as the model on the reducing lathe for the creation of the master hub.&nbsp; The metal surface of the galvano is tough enough to resist being damaged by the tracing point of the reducing lathe.&nbsp; The clay or plaster model would be destroyed by the tracer.&nbsp; Galvanos are no longer used at the mint anymore.&nbsp; For many years they were replaced by an epoxy casting from the negative plaster cast.&nbsp; The epoxy was much faster than the electroplating and was also tough enough to stand up to the tracer.&nbsp; In modern times the reducing lathe has been eliminated completely and the hubs are now cut directly by computer from the design in its memory.[/QUOTE]</p><p><br /></p>

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