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Crank slider-4 bar linkage

  1. Jan 12, 2005 #1
    anybody knows about 4 bar linkage??
    there's a crank and slider mechanism and i need help... i would like to know more about the crank slider and what is it made of?? what is that slider made of?? roller?? 2 bars and a square metal?? help!! thanks alot...
  2. jcsd
  3. Jan 13, 2005 #2


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    If it's in a mechanics textbook, it doesn't matter. It's just a model, it means that the slider is allowed to slide but restrained in other directions of movement.
  4. Jan 13, 2005 #3
    emm.. no... what if it's not in the textbook... and i am suppose to make the slider out... do you or anyone have any ideas?? thanks... cos currently i am having my industrial attachment thingy and i am thinking of some machine improvements... and need to design something like that... and i do not know what that thing is actually like.. what i know is just the model and the drawing..
  5. Jan 13, 2005 #4


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    Well I'm not sure I understand.

    What are you making? Could you use a smoothed block and some polished surfaces? Perhaps a t-slide? Or just some rollers? If you provide more information we might be able to help!
  6. Jan 14, 2005 #5
    it is not easy to explain... emm... cos i am designing some improvements... and i just want to know how a crank slider work and how is it like(for the real) thing...
    i am still designing and i need to know it just to visualise whether it can be fixed onto that machine or not... cos due there is some obstructions, i got to first visualise and see whether will it works..
    thanks so much for your help...
  7. Jan 14, 2005 #6
    A normal piston engine is an example of a crank slider. The piston is the slider. The fourth bar in a four bar linkage doesn't move - it is the frame that the other (moving) bars attach to.
  8. Jan 16, 2005 #7
    thanks so much for your help, ceptimus... so, is the piston hydraulic?? or pneumatic?? normally for a four bar linkage, a motor is attached to trigger it to move the bars, so for this crank and slider, it is the slider that is using a piston to move the rest of the bars??
  9. Jan 16, 2005 #8


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    You're not making any sense.

    A four bar linkage is just a simplification for a mechanism found in many machines, the piston engine is just one of them. In a car engine, the piston is powered by expanding gases being combusted. On something else, the mechanism may be hydraulically actuated, or driven by an electric motor, or by a big hamster wheel, whatever.

    Show us your application and we'll show you how it works. Perhaps you have a motor turning your crank, perhaps you have a compressed source pushing a piston, all you've told us is that you're using a four-bar linkage!
  10. Jan 18, 2005 #9
    so the four bar linkage is a simplification for mechanism found in machines, i got what you mean. because what i have learnt are those theories part of this four bar linkage and it doesn't tells me that it is the simplification for mechanism found in machines or maybe i didn't make good notice of it.

    well, i don't have the application, because i am trying to design out and four bar linkage just come to my mind. what i am going to design is a mechanism that can flip parts (from die casting) when the part is being dropped from the top by a robot arm. i am still learning as i am an IA (industrial attachment) student and that is my task and that is also why i want to know more about this four bar linkage.

    you get me now?
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