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<p>[QUOTE=&quot;ToughCOINS, post: 8050098, member: 20480&quot;]You&#039;re correct, but the same positioning tolerances apply to that process as well.&nbsp; In addition, because of additional errors inherent in laser etching (tolerances on power supplied, travel speed (or dwell time), and focal distance from laser to target of ablation), the potential resultant errors in position or feature rendering should be even greater than for machining.</p><p><br /></p><p>I&#039;ve no experience looking for this on coins, and thus haven&#039;t proven it to myself, but the amount of energy required to remove material is a function of how much the local mass in target areas varies (local mass affects how fast heat sinks away from the target).&nbsp; The more mass, the slower the cutting speed should be.</p><p><br /></p><p>The proximity of the laser to the detail being etched (the aforementioned focal distance) also dictates adjustments to the energy input to the process.</p><p><br /></p><p>Since the depth of cut varies considerably on a coin&#039;s surface, it stands to reason that the quality of etching will vary somewhat in different areas.&nbsp; This may be a good way of determining if a coin has been replicated with a laser.[/QUOTE]</p><p><br /></p>

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