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<p>[QUOTE=&quot;Suarez, post: 4846869, member: 99239&quot;]I was wrong about this. A CNC can easily do better than 0.1mm with the right stepper motor. The functional limit is the stylus. The thinnest router bit I&#039;m aware of is a 1/64&quot; (which works out to 0.3mm). Your CNC therefore is limited to this &quot;resolution&quot;. </p><p><br /></p><p>You can make a thinner bit of course but so does the maximum pressure you can apply before the bit hits the breaking point. I don&#039;t think there is a material that has sufficiently high tensile strength AND hardness to be able to carve detail into steel at &lt;0.1mm.</p><p><br /></p><p>However, there is another method I didn&#039;t think about. You can just use a fiber laser machine. With a resolution of just 0.01mm(!) I think that could do a convincing job of replicating fine detail at least to pass an unaided eye test. Just one problem though.... the laser does the carving by burning away material. Good detail but scorched black. So not so good for forging coins after all!</p><p><br /></p><p>Rasiel[/QUOTE]</p><p><br /></p>

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