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<p>[QUOTE=&quot;Hobo, post: 1155214, member: 11521&quot;]mani,</p><p>&nbsp;</p><p>By &quot;die preparation&quot; they are talking about the process during which the die is made, not when it is used to strike coins. When a die is made a hub is pressed into it. This is called &#039;hubbing&#039;. Before the hub is pressed into the die the die steel must be softened (annealed). When the hub is pressed into the die the die metal becomes &#039;work hardened&#039; so the die steel must be softened (annealed) again before the next hubbing. In the US dies are now made using the &#039;single press&#039; hubbing process so the dies do not have to be annealed but once (before being hubbed). After the dies have been hubbed they are hardened and ready to strike coins (after additional preparation work has been completed).</p><p>&nbsp;</p><p>Planchets, on the other hand, have been work hardened by the process of being rolled, the blanking process and the process of raising a rim (in the upset mill) and have to be annealed before they are struck by the dies.[/QUOTE]</p><p><br /></p>

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