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<p>[QUOTE=&quot;cpm9ball, post: 2136913, member: 24633&quot;]Okay! It seems that the hub die and the working die are not tightly fixed in the chamber. Also, the working die blank has a conical shape, so that when pressure is exerted, the two can slip against one another creating Class VIII doubling in the central area of the die. However, nowhere is it referred to as &quot;Bump Doubling&quot; in Wexler&#039;s explanation. It does mention that the Mint employees would often hear a clunking sound when the hub die and the blank working die came into contact.</p><p><br /></p><p>So, why in the heck don&#039;t they call it <b>&quot;Clunk Doubling&quot;</b>?</p><p><br /></p><p>Note: Wexler goes on to say that this form of doubling is pretty common to the single-squeeze method of die making. If it is that common, why care about it?</p><p><br /></p><p>Thanks!</p><p><br /></p><p>Chris[/QUOTE]</p><p><br /></p>

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