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<p>[QUOTE=&quot;davidh, post: 1230448, member: 15062&quot;]Using an ultrasonic cleaner requires that you understand the principle under which it works.&nbsp; An object to be cleaned is immersed in a liquid and a transducer is used to send ultrasonic sound waves through the liquid.&nbsp; These sound waves can be from 20K Hz up to 500K Hz.&nbsp; When the sound waves hit the object to be cleaned, alternating high and low pressure areas are formed.&nbsp; When the pressure goes from high to low, a microscopic bubble is formed, which immediately collapses, causing a shock wave which blasts any contaminants away from the object&#039;s surface.</p><p><br /></p><p>These shock waves can also produce enough pressure to deform softer metals such as aluminum, copper and silver.&nbsp; Additionally, the higher the sound frequency, the smaller are the bubbles that will form.&nbsp; This means that they will get into smaller cracks and scratches in the metal surface.&nbsp; This can have the effect of enarging the cracks and scratches.</p><p><br /></p><p>Finally, the liquid being used affects the action of the cleaner.&nbsp; Whatever you expect to remove should be soluble in the liquid.&nbsp; Water is fine for removing normal dirt; organic liquids should be used to remove oils and other organic debris.</p><p><br /></p><p>The action of ultrasonic bubbles acting on metallic surfaces is called cavitation.&nbsp; Besides using an ultrasonic source to create the cleaning bubbles, moving the metal through the liquid at high speeds can also produce the bubbles.&nbsp; This is commonly seen in ship&#039;s propellers moving through water.&nbsp; If the propeller is not designed properly, cavitation can severly pit and crack the propeller.</p><p><br /></p><p>Cheap Harbour Freight cleaners probably won&#039;t do much more cleaning than if you simply soaked the coin in the cleaning solution.&nbsp; An industrial cleaner will probably clean the coin, but might also destroy it, or at least the surface, in the process.[/QUOTE]</p><p><br /></p>

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