In the quest to produce more perfect resin castings, industrial designer Eric Strebel observed how folks who work with concrete and plaster get the bubbles out of their mixtures. He then came up with the idea of vibration casting, and spoke with the lead chemist and a manager at BJB Enterprises, a manufacturer of polyurethane resin, to confirm he was on the right track.
Here's the method Strebel came up with, which can be done without using a pressure tank:
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If Eric Strebel paid you to say he discovered the wheel would you run the story?
Way back in Design School we would sit the mold on one end of a block of wood and use a random orbital sander on the other. A bit noisier, but the price was right!