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<p>[QUOTE=&quot;ToughCOINS, post: 2882064, member: 20480&quot;]When the blanking dies get dull, they can shear the material incompletely (not the same as an incomplete punch), and the blank hangs momentarily from an unshared remnant of the parent stock before being pulled away, severing the blank in tension rather than shear, and leaving a sharp burr.&nbsp; </p><p><br /></p><p>That burr stands proud of the edge of the blank, much like an icicle hanging from the roof of a house in winter.&nbsp; When struck, the burr is impressed into the coin.[/QUOTE]</p><p><br /></p>

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