Electro type cast - First time for me

Hello gang,

Here we have a Electro type cast made for the 2 Kronur - This is made after the plaster case using electricity and is owned by the central bank of Iceland.

Google show´s alot of counterfeit articles but nothing within the mint process.

I´m hoping someone would give me more details on the process

 

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Try Charles Larson's book.... it's available on Amazon (and just about everywhere else).

 

Thank you, but I know the forgery type but this is not a forgery. This was used in the minting process either in the UK or Denmark. It´s the size of a dinner plate

 

Then try this thread, Siggi... there's a post near the the end that links a youtube vid on the process.

http://www.cointalk.com/t206702/

 

That is called a galvano. The original design was made either using modeling clay or sometimes plaster. From that a negative casting was done in plaster and the negative was then heavily electroplated. Sometimes just with copper, sometimes with layers of copper and nickel for strength. The thickness of the plating would be built up enough that the metal shell could support itself. the inside of the galvano would then be filled with plaster for additional support. This oversized metal shell would then be used as the model on the reducing lathe for the creation of the master hub. The metal surface of the galvano is tough enough to resist being damaged by the tracing point of the reducing lathe. The clay or plaster model would be destroyed by the tracer. Galvanos are no longer used at the mint anymore. For many years they were replaced by an epoxy casting from the negative plaster cast. The epoxy was much faster than the electroplating and was also tough enough to stand up to the tracer. 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.

 

I tell you one thing my dear friend.....You sure come up with some of the greatest Icelandic numismatic stuff I have ever seen.....You know I'm starting to really hate you buddy.....LOL,,,Just kidding. I'm going to do some reading up on this.
This Very Very cool looking. Do you have the other side of this ????

 

The reason why I stay at coin talk is the answer conder has given me, To share knowlidge is one of the greatest thing about coin collecting.

Thanks conder for giving me the time you did, I appriciate that very much. Gudni the other side is not avalable but one thing I saw were the original drawings of the coin. now those were cool