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<p>[QUOTE=&quot;Hommer, post: 2587925, member: 73266&quot;]When a blank is punched out of a sheet, it is larger in diameter than a struck coin. The blank is ran through an upsetting mill which not only reduces the diameter but also pushes metal up around the edge so that there is sufficient material in that area to form the rim when struck. Before being ran through the upsetting mill, it is called a blank, after it leaves the mill, it is called a planchet.</p><p><br /></p><p>The upsetting mill pushes against the edge of the blank and squeezes it, kinda like pushing pizza dough around the edge to form a pizza crust. If there is a clip, there isn&#039;t enough resistance on the opposite side of that area to push agaist, so it won&#039;t raise the edge on the opposite side. If it isn&#039;t raised, there won&#039;t be enough material there to properly form the rim.[/QUOTE]</p><p><br /></p>

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