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Molding plastic parts - an experiment 444-544

posted by  Alfixit on  Sun Oct 16 04:27 CST 2005
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last visit: Mon Feb 4 13:00 CST 2008
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The concrete building industry uses vibration to settle the aggregate and remove air from the concrete in the form. They use a motor-driven eccentric in a steel head at about 10,000 vibrations per minute. The vibrating head is meant to be inserted into the concrete, but I have seen it used to vibrate the form itself or the rebar in the concrete.
The effect is like magic. The vibration makes the concrete more liquid as it excites the water in it. It consolidates the concrete and the air bubbles out the top.
--
Al Hagenberger '84 240 190Kmiles, '87 744 202Kmiles






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