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  1. Maglatron

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

    hmm just need to find the slopes first of the cam if you can shed any light on that, one step at a time! so I worked out that the wheight drops as 0.5068m/s free fall and that it takes 0.4995sec for the weight to drop if the wheel starts at 4pi rad/s so I would only 2 lobes on the cam rotating...
  2. Maglatron

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

    so imagine this: you're peddling down hill in first gear the bike gets too fast for your legs to keep up, its like this how fast can the wheel be going before its at the speed when the weight drops and it's no longer adding to the wheel because it requires the weight to drop faster than gravity...
  3. Maglatron

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

    anyone?? so put a couple more parameters on the image for visual understanding for the cam
  4. Maglatron

    Tom Mics Issues

    koool as tis grand so do you play drums? or any other instrument
  5. Maglatron

    Tom Mics Issues

    hows tom mics?
  6. Maglatron

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

    The weight through the lever/ gear system has to accelerate against the inertia of the flywheel so it wouldn't be freefall if the flywheel is spun by the dropping weight through levers and gears and the initial rotational speed of the flywheel is 12pi rad/s 6 rotations/second or 360RPM and its...
  7. Maglatron

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

    modified project picture
  8. Maglatron

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

    infact what I would do is put in a spring above the weight to bounce it back downwards like the ones that are at the end of a train track to make sure it doesn't go over 1.265m
  9. Maglatron

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

    not at all! infact that would be good but why would it continue up and for how much further would it move when gravity takes over and the edge of the cam drops off at the end of the lobe I see this like accelerating a tennis ball up wardsat a certain accelerate the ball would leave the hand also...
  10. Maglatron

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

    the scissor lifts a weight of 175g the cam turns clockwise without stopping it lifts the weight up and drops down again when the lobes go past each time
  11. Maglatron

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

    so I think I've settled on the design I'm going to have 3 lobes and it will take 0.25sec to lift the load, 3x if turning 2pi rad/sec
  12. Maglatron

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

    yes drop to minimum did you read the pdf??
  13. Maglatron

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

    still have to design the mechanism just getting a skelington - bare bones of the machine, but it's lifting a weight of 0.275kg it takes 0.25s to move up and then it's free to drop again the weight drops and takes 0.17s to drop at wheel speed 12pi rad/s 0.0257 second is free fall. the four...
  14. Maglatron

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

    yes considered that I'll try do a drawing in paint the acceleration is also this would only need to rotate 2pi rad and will still make the scisso move up in 0.25sec, I want the radius to be 0.45m diameter 0.90m (from the top the top snail to the bottom of the botton snail) can you help me...
  15. Maglatron

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

    any thoughts on that? thanks
  16. Maglatron

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

    here's the is the idea
  17. Maglatron

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

    so I come up with a solution: make a spiral shape with a constant slope from 0.05 to whatever the the length gets to when it reaches 2 pi and adjust the levels in the scissor accordingly! or this idea is good make the cam much larger and the slope will get shallower dramatically!!
  18. Maglatron

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

    ok so where you got the value 0.137 the value i get is The correct value for the constant slope m is 0.02005 meters per radian Multiplying by 2π again would not be necessary since m already represents the change over the entire 2π radians. Therefore, the slope is correctly calculated as...
  19. Maglatron

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

    ok thanks anyway dood but the calculations were correct?
  20. Maglatron

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

    should do but after taking out losses this will not work as it stands need to refine design, help if you like
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