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  1. mymagicpie

    Impact Force Help

    Thanks, some good suggestions there. However, I am fixed with having a steel to steel contact. Not ideal. I have worked backwards and found that the 'stopper' will require 5kN load to fail in shear. So the question is, will the moving mass impact force exceed the 5kN. Engineering judgement...
  2. mymagicpie

    Impact Force Help

    It is a very simple mechanism. Which involves a mass running down a guided track. The mass is stopped when it collides with the 'stopper' part. The stopper is a raised boss which sits on the track at the end of the stroke. I am simply trying to determine if this boss part is suitably sized so...
  3. mymagicpie

    Impact Force Help

    Hi, This is a simple question (I think). I need some help to calculate an impact force. The information I have: * The object has a mass of 0.2kg. * The velocity at the point of impact is 2.5m/s. * At the point of impact, the object is being accelerated only by gravity. Using: Kinetic Energy...
  4. mymagicpie

    Time for an index plunger to fully release

    Ah ok I think I see it now. S = u*t + 0.5*a*t^2 So as the inital velocity is = 0, the u*t can be cancelled out, and then it is just a case of rearranging the 0.5*a*t^2? So: t = SQRT (s/(0.5*a)) = SQRT (0.003/(0.5*1375)) = 0.0021 s. Is that correct?
  5. mymagicpie

    Time for an index plunger to fully release

    Ok some numbers. Well, Pre plunger release the spring is providing a 24N force onto the plate. After release (AKA bottoming of the plunger) the plunger is providing 9N force. The mass of the plunger is 0.012kg. Therefore F = Ma So: a = F / M = 24 / 0.012 = 2000 m/s^2 and 9 / 0.012 = 750...
  6. mymagicpie

    Time for an index plunger to fully release

    Hi, I need to calculate the time for an index plunger to fully release. The basic setup is simple. It pretty much identical to a collapsible loft ladder. Within a sliding mechanism, we have a fixed plate and a sliding plate. A plunger is housed within the fixed plate. This plunger is...

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