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  1. Maglatron

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

    lets just work out what force is needed to lift the weight of 275grams a hieght of 1.26m in 1 second, thanks if the snail shell cam max radius is 0.12m and the radius of the thinest part of the cams radius is 0.05m spiraling outward, force needed equals 0.2753233775 * 9.80665 = 2.7N hmmm
  2. Maglatron

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

    so relating this back to my mechanism I need to In 1 second how much force would one need and the platform is free to move up and down if you take a look the support on the right side of the platform is a roller!
  3. Maglatron

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

    thank you Mr Alec_t thats really helpfull let me just redraw for clarification of where the load would be, so by what you were saying then the force applied to the pivot at level 4 moves a distance dy then the load would move in the y direction 4*dy and that is the ratio of the displacement and...
  4. Maglatron

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

    sorry man its a lot of working out I'm not interested in the forces in the z or x axis or if it topples, I am not designing a scissor lift I just want to know, 1) ratios between the input distance moved and output distance moved, 2) the mechanical advantage of the of this very simpe machine...
  5. Maglatron

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

    seriously there has to be a simpler way around this
  6. Maglatron

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

    can you point me to a competent web page to learn about levers, youtube isn't that great! also for Mr Delta Prime no where in that document does it mention the design I want as I said I need to have one like this
  7. Maglatron

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

    how would you go about modelling the scissor mechanism with the lever principal, this might take me a while so please bare with!
  8. Maglatron

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

    ok here's another for your viewing pleasure this is not got the scissors in though
  9. Maglatron

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

    so I know you said your maths is a bit rusty but could you shed any light on the mechanism, maths wise? thanks
  10. Maglatron

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

    I don't get it!
  11. Maglatron

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

    you can ignore the problem in the image! that was something else! thanks
  12. Maglatron

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

    anybody have anything actually helpfull?
  13. Maglatron

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

    my internet doesn't allow that site, tut
  14. Maglatron

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

    what on earth is a huckleberry?
  15. Maglatron

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

    I want to use the scissor mechanism in conjunction with the mechanism (that I posted in another thread) to lift the weight of 275grams a hieght of 1.26m and drive the cam with the motion of the wheel!my thinking is that if the wieght is lifted quickly it won't have the time to slow the wheel...
  16. Maglatron

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

    from memory Mr Alec_t was very good with mechanical stuff are you around Mr Alec_t??
  17. Maglatron

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

    so breaking it down 1) the cam, shaped like a snail shell, need in depth info on how force and displacement (energy) is consumed during a rotation of (2pi rad) 2) how to design the scissor bar lengths and how many stages do I need, in my diagram that I privided, there are two stages above where...
  18. Maglatron

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

    thanks mate caught that myself! anyone recommend a book with mechanisms in??
  19. Maglatron

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

    so I drew a diagram
  20. Maglatron

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

    I will sign up to the site though because they have some PDF files that I'm interested in thank you
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