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  • Users: LEberhart
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  1. LEberhart

    Penny Sorting Aluminum Channel - weight discriminate trap door.

    I want to build a trap door about an inch long in a 1/2 wide aluminum channel down which pennies will slide. I want new pennies (weighing about 2.5 g) to continue, but old pennies (weighing 3+ g) to drop thru the hinged piece. Can I use opposing compression and torsion springs to optain such...

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