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  1. Alec_t

    I want to know all of the maths concerning this scissor mechanism!

    This site may be helpful?
  2. Alec_t

    I want to know all of the maths concerning this scissor mechanism!

    See my edit to post #244.
  3. Alec_t

    I want to know all of the maths concerning this scissor mechanism!

    There must be a way, but I'm not aware of the formula. Perhaps ChatGPT can come up with one? It would also have to take into account the masses of any spokes and hub used to support and rotate the ring. Those masses and their shapes would affect the moment of inertia of the flywheel. Edit...
  4. Alec_t

    I want to know all of the maths concerning this scissor mechanism!

    I agree with ChatGPT. Weight = pi x r^2 x thickness x density. So thickness = weight/(pi x r^2 x density).
  5. Alec_t

    Help to fix a broken hydroponic

    Have you checked that all plugs and sockets are fully engaged?
  6. Alec_t

    I want to ask a few questions. Can I control a 380 DC motor using Arduino with a driver card? And I want to ask another question. Can I calculate the

    a) Yes. b) Yes. Welcome to maker.pro!
  7. Alec_t

    I want to know all of the maths concerning this scissor mechanism!

    Sorry, I can't.
  8. Alec_t

    Upgrading my fugen laptop cooling pad

    More powerful motors would produce more fan noise and deplete battery charge faster. Are you ok with that?
  9. Alec_t

    Ultrasonic cleaner

    If the transducer's resonant frequency is affected by the cleaning load you may have to tweak the oscillator frequency accordingly to maintain maximum amplitude.
  10. Alec_t

    When the engine starts, sound will come from the mp3 card, and when the engine stops, sound will come from another mp3 card.

    Welcome to maker.pro! If your brother has impaired hearing wouldn't it be simpler/better to turn a light on/off when the motor is on/off?
  11. Alec_t

    I want to know all of the maths concerning this scissor mechanism!

    That will require an acceleration of ~50g ! Somethings going to break!:eek:
  12. Alec_t

    I want to know all of the maths concerning this scissor mechanism!

    If the cam (not the gearing) provides the force to lift the weight and you want the weight to fall freely (with the gearing disengaged) then the gearing serves no useful purpose that I can see.
  13. Alec_t

    I want to know all of the maths concerning this scissor mechanism!

    A problem I see with your gearing is that as the weight rises it will cause (or assist) the flywheel's anti-clockwise rotation, but that continued rotation will prevent the weight from subsequently descending.
  14. Alec_t

    I want to know all of the maths concerning this scissor mechanism!

    So the flywheel drives the cam, the cam drives the scissor mech, the mech moves the weight, the weight moves the gears, the gears rotate the flywheel, the flywheel drives the cam, ........ I hope you're not expecting perpetual motion?
  15. Alec_t

    I want to know all of the maths concerning this scissor mechanism!

    The more I look at your set-up the more I'm reminded of Roland Emmett's gizmos :D
  16. Alec_t

    I want to know all of the maths concerning this scissor mechanism!

    Re-thinking the maximum torque needed, it won't occur at the maximum radius of the cam as assumed so far; it will actually be at the minimum radius by my reckoning, for the following reason. You want the weight to rise at constant velocity; but when the weight falls to its lowest point it...
  17. Alec_t

    I want to know all of the maths concerning this scissor mechanism!

    mg = weight. So PE =weight x h.
  18. Alec_t

    I want to know all of the maths concerning this scissor mechanism!

    I don't think you need that g factor in the potential energy calculation, since it is inherent in weight (as distinct from mass).
  19. Alec_t

    I want to know all of the maths concerning this scissor mechanism!

    :D
  20. Alec_t

    I want to know all of the maths concerning this scissor mechanism!

    You have 0.279.... in the penultimate line but used 0.234..... in the last line.
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