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<p>[QUOTE=&quot;Kevin Mader, post: 6665610, member: 106826&quot;]The explanation provided by Fred makes sense.&nbsp; Weak strike will not move the material around fully and may be compounded by the zinc, which is harder to flow relative to copper.&nbsp; I don&#039;t think grease is out of the question.&nbsp; Typically, the manufacturing materials are introduced at a specific point to keep the tools lubricated and to extend the life of the tool.&nbsp; Too much and things get sticky...problems in production.&nbsp; Also, the cleanliness of the material being coined.&nbsp; Dust becomes more problematic when oil is introduced.&nbsp; I got to wondering a while ago about the orientation of the press (vertical vs horizontal), how substrate material affected the coining process, point where lubricant is added, and if gravity was a factor.&nbsp; I read that when determining weak strikes, consider the definition where the field meets the rim.&nbsp; If the rim is defined, then you might want to consider grease.&nbsp; Greasers tend to have full rims but are missing devices/details as we see here.</p><p><br /></p><p>So, maybe it&#039;s all the above.&nbsp; Good discussion no matter, and getting a lookback into the mint in the 80s relative to equipment helps develop a fuller picture for me.[/QUOTE]</p><p><br /></p>

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