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<p>[QUOTE=&quot;physics-fan3.14, post: 2254998, member: 19165&quot;]While I can appreciate your analogy, that is extremely far from what actually happens: </p><p><br /></p><p>When the die strikes the coin, it happens very quickly at a very high pressure. There is a bouncing action that may happen which may produce strike doubling (for a more detailed description, I&#039;ll point you to Roger Burdette&#039;s exemplary book, &quot;From Mine to Mint.&quot;)</p><p><br /></p><p>When a die is created, it is impressed by a hub much more slowly, at much lower pressures. The first impression causes &quot;work hardening&quot; of the die. The die is then softened, and the hub is applied a second time. However, the mechanical stresses in the die may cause a small amount of distortion during this process. The hub and die are aligned by notches in each, but if the mechanical stresses have caused some distortion between the first and second hubbing, then the second hubbing will be shifted slightly. This is the cause of a hub-doubled die. There is no &quot;bouncing&quot; of the hub, because it is a slow process - the die is not &quot;struck&quot; from the hub.[/QUOTE]</p><p><br /></p>

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