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  1. Franko314

    Need an Electro-Magnet, 3Volts, 0.1Watts, 200 grams or more pick up and holding

    Anyone know if I can buy one with the above specs. I am designing something that has to run on batteries that should last more than 2 years ideally a lot more. The electro Magnet in energized for 5 seconds, 40 times per day. a AA Lithium Ion battery has 1600mAh of stored energy. I would need 2...
  2. Franko314

    Raising/opening a wooden toy chest door using Torsion springs or constant force springs

    Thank you @desertfox It is not hard to open a 2 Kg door by hand, unless you want to grab it by the hinge to do it. Effectively making your torque ZERO. Thank you @r13 for calculating the Torque required. Sorry for mixing units. When I built this using a gas spring, I arrived at the same...
  3. Franko314

    Raising/opening a wooden toy chest door using Torsion springs or constant force springs

    Thank you 3DDave. Did not think about the non-linear force. Adding external damper is definitely not a problem. Looks like my best bet is to go with a Torsion spring. The question is how do I spec out the Torsion Spring? What Torque? If I have to, I can change my spec and go up in 5 seconds...
  4. Franko314

    Raising/opening a wooden toy chest door using Torsion springs or constant force springs

    My apologies since I am an EE trying solve a mech problem which I thought was easy and it's not. And it has definitely been decades since MECH 230 at NJIT. The toy chest door/lid is a rectangle of 14" x 18.5" and weights 1.67Kg The axis/hinge is a threaded rod 10mm in diameter. I attached a...
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