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<p>[QUOTE=&quot;Hommer, post: 3373470, member: 73266&quot;]When a coin blank is punched from the sheet, it is slightly larger than the finished coin. The reason is that this extra metal is needed near the rim to form a full rim when the coin is struck. The blank, after being punched out, goes through a machine called an upsetting mill. This upsetting mill has rollers in it that will squeeze the edges making the blank smaller and pushing up a ridge of metal around the edge of the blank that will form the rim of the coin when struck.</p><p><br /></p><p>When the blank is clipped, the rollers in the upsetting mill have no resistance on the opposite side from the clip to be able to push up the ridge of metal to properly form the rim of the coin on the opposite side from the clip. The resulting weak rim and weak details near the rim on the opposite side of the coin from the clip, is called the Blakesley effect, named after the person who first explained this effect..[/QUOTE]</p><p><br /></p>

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