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<p>[QUOTE=&quot;SuperDave, post: 2314665, member: 1892&quot;]One from the Pro Tip Library (one of a number of solutions, all of which individually affect how you employ the transducers differently): Basket-weave monofilament.</p><p><br /></p><p>Remember, the &quot;ideal&quot; way to expose a coin to an ultrasonic vibration is to suspend it alone in a magnetic field so nothing whatsoever is touching it. Whatever the coin is touching while the transducers are running will affect the cavitation in that area, and even though you could correct for that, the correction would adversely affect the open areas of the coin. The key to consistent results is consistent application of the bubble bath (which is what I call it <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie1" alt=":)" unselectable="on" unselectable="on" /> ). You only do one coin at a time, you minimize that coin&#039;s chance of contacting something &quot;solid&quot; while being vibrated, and (I hate dribbling information out like this) the more contact the coin has with other things, the more you need to vary the frequency and orientation of the coin during the process.</p><p><br /></p><p>The ideal weapon for numismatic applications is able to vary the transducer frequency between 40kHz and 120kHz, while at the same time having accurate temperature control of the solution up to 100C. Unfortunately, that weapon doesn&#039;t really seem to exist; if I want one I&#039;ll have to build it myself. They aren&#039;t really that complicated; you could for instance rework one with the right sort of solution control using custom transducers.... <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie1" alt=":)" unselectable="on" unselectable="on" />[/QUOTE]</p><p><br /></p>

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