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<p>[QUOTE=&quot;Hommer, post: 8356555, member: 73266&quot;]It&#039;s there but metal flow isn&#039;t what causes it, more like lack of metal to flow. When a blank goes through the upsetting mill it is basically squeezed by the edges between 2 rollers which not only shrinks the diameter of the blank but also pushes metal up around the perimeter. This is called the upset and this extra metal around the perimeter is needed to form the rim of the coin when struck. Where Blakesley Effect comes from is when the clipped blank is squeezed between the rollers in the upsetting mill, there is no resistance&nbsp; or pressure on the opposite roller from where the clip in the blank is. With no resistance, metal cant be pushed up to form the upset and eventual rim. For this reason, when the coin is struck, the rim opposite of the clip will be weak or non existent.[/QUOTE]</p><p><br /></p>

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