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Let's start a discussion for the weekend : What is a scratch?
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<p>[QUOTE="ToughCOINS, post: 8047961, member: 20480"]A new suggestion for addressing different applications of the definition scratch in the context of our field.:</p><blockquote><p><br /></p><p><b>A scratch, caused by sliding contact under pressure, is a groove plowed in a surface.</b></p><p><br /></p><p><b>A scratched coin exhibits a groove plowed in the surface after it has been minted; not before. The material displaced by the groove rises above the original surface, either side of the groove.</b></p><p><br /></p><p><b>A scratched planchet exhibits a groove that was in the surface of the planchet before the coin has been minted. While a scratch in a planchet may not be completely filled when the coin is struck, the displaced material above the original surface of the planchet gets struck back within the intended geometry of the coin by the dies, and is not evident on a struck coin.</b></p><p><br /></p><p><b>A scratched die has a groove in the surface of a die before striking the coin. The groove in the die will transfer to the coin as a raised feature. The displaced material either side of the groove in the die may leave subtle impressions in the struck coin, depending upon relative hardness of the striking and struck materials, but this will eventually wear and flatten out some, if not totally.</b></p><p style="text-align: right"><br /></p> </p></blockquote><p>[/QUOTE]</p><p><br /></p>
[QUOTE="ToughCOINS, post: 8047961, member: 20480"]A new suggestion for addressing different applications of the definition scratch in the context of our field.: [INDENT] [B]A scratch, caused by sliding contact under pressure, is a groove plowed in a surface.[/B] [B]A scratched coin exhibits a groove plowed in the surface after it has been minted; not before. The material displaced by the groove rises above the original surface, either side of the groove.[/B] [B]A scratched planchet exhibits a groove that was in the surface of the planchet before the coin has been minted. While a scratch in a planchet may not be completely filled when the coin is struck, the displaced material above the original surface of the planchet gets struck back within the intended geometry of the coin by the dies, and is not evident on a struck coin.[/B] [B]A scratched die has a groove in the surface of a die before striking the coin. The groove in the die will transfer to the coin as a raised feature. The displaced material either side of the groove in the die may leave subtle impressions in the struck coin, depending upon relative hardness of the striking and struck materials, but this will eventually wear and flatten out some, if not totally.[/B] [RIGHT][/RIGHT][/INDENT][/QUOTE]
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Let's start a discussion for the weekend : What is a scratch?
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