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<p>[QUOTE=&quot;19Lyds, post: 1809906, member: 15929&quot;]Machine Doubling occurs when the ejection mechanism of the press begins the action of &quot;pushing&quot; the coin out of the coining chamber before the hammer die is completely clear of the coin. The end result is flat and shelf like.</p><p>&nbsp;</p><p>If you were to take a homemade &quot;potato&quot; die and press it into soft modeling clay but &quot;move&quot; the clay before the potato was clear of it, you would then be imitating Maching Doubling on a coining press.</p><p>&nbsp;</p><p>High speed coining presses have certain tolerance limits built in to both extend die life AND prevent the press from being damaged.[/QUOTE]</p><p><br /></p>

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