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<p>[QUOTE=&quot;Hobo, post: 1168917, member: 11521&quot;]If you don&#039;t know already, learn the entire coin-making process from mixing the alloy, rolling the metal into a strip, blanking, upsetting the blanks to create a raised rim, annealing, and washing. That&#039;s just for planchet preparation. You will also need to understand how dies are created - a Master Hub is created and is used to make a small number of Master Dies which are used to create a number of Working Hubs which are used to create the Working Dies. You should understand how the die press works - feeder fingers slide a planchet into place while moving the previously-struck coin to the hopper, the planchet drops into the collar, the dies come together to strike the coin, the anvil die pushes the coin up to be carried off by the feeder fingers, etc. (That is for a vertical coin press. The operation of a horinzontal coin press is different.) </p><p>&nbsp;</p><p>Once you understand how coins are made you will be able to understand how error coins are produced. And - hopefully - you will be able to distinguish a coin with PMD from a true error coin.[/QUOTE]</p><p><br /></p>

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