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<p>[QUOTE=&quot;walterallen, post: 129199, member: 4068&quot;]<b>Science Fact</b></p><p><br /></p><p>This bit of science fact amazed me when I learned to machine metal. This fact applies to all material not just metal.</p><p><br /></p><p>I&#039;m going to use wood as an example because most people don&#039;t tool metal, but most have melted wood before and never realized it.</p><p><br /></p><p>When you take a cutting tool and cut material the science of it is that what you are really do is MELTING it. </p><p><br /></p><p>Take for instance a wood plain or better a pencil sharpener. When the edge of the cutting tool comes in contact with the wood, pressure is very great because of the small surface area of the blade edge. As pressure builds it creates heat and it is the heat that melts the wood and cause the material to separate. That is why pencil shavings are coiled. The side that melted expanded and became longer then the other side, thus creating the coil. </p><p><br /></p><p>This same principle works in the production of Minting coins. When the die strikes the planchet it does so with great preasure. That preasure melts just the outer side of the planchet and the melted metal flows into the relief of the die.[/QUOTE]</p><p><br /></p>

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