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  • Users: gravesity
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  1. gravesity

    Calculus challenge for a cam design

    Hello any math wizards out there, I'm designing a machine that includes a large, heavy arm which pivots on a shaft. When the unit is in operation, we hold the arm up with an electromagnet; when the magnet is shut off, gravity swings the arm down through 35 degrees until it hits a stop. To...
  2. gravesity

    Plastic-plastic friction vs. plastic-steel friction

    I am redesigning a micro-hydro educational tool that is essentially a Pelton wheel runner spinning in a polycarbonate enclosure. Our current design uses a steel axle spinning inside a boss in the enclosure. We're considering changing that to a polycarbonate axle so we can reduce our part count...

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