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<p>[QUOTE=&quot;Conder101, post: 1033928, member: 66&quot;]The cent would be placed in the hole of the aluminum blank and then struck in a press with dies that have a central hole.&nbsp; As the aluminum was struck it tries to expand both outward against a restraining collar and inward against the coin.&nbsp; If you were to punch the coin out of the ring and examine the edge you would find that it is now slightly concave from where the aluminum pushed in the center of the edge.&nbsp; In some cases the hole in the die is also just slightly smaller in diameter than the coin.&nbsp; This tends to crush the coin edge down onto the intruding aluminum an helps to lock the two pieces together.&nbsp; So no glue, no heat, it is a physical interlocking of the two pieces caused by the striking.</p><p><br /></p><p>This is the same technique used to create bi-metalic coinage only the whole assembly is stuck rather than just the outer ring.[/QUOTE]</p><p><br /></p>

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