Scissor linkage: dynamic analysis

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Discussion Overview

The discussion revolves around calculating the force required to maintain equilibrium in a scissor linkage system at a specific position. Participants are exploring the dynamics involved in this mechanical setup, particularly in relation to the geometry of the linkage and the applied force.

Discussion Character

  • Homework-related
  • Technical explanation

Main Points Raised

  • One participant seeks assistance in calculating the force F needed to keep the scissor linkage in equilibrium, specifying parameters such as arm length (L), horizontal distance (a), height, and supported weight.
  • Another participant suggests performing a forum search for related discussions, indicating that similar topics may have been covered previously.
  • A third participant reiterates the suggestion to search the forum and expresses gratitude for the provided link, indicating a potential misunderstanding in the search terms used.
  • A fourth participant requests that the original poster provide their initial attempt at solving the problem to facilitate more targeted assistance.

Areas of Agreement / Disagreement

There is no consensus on the method to calculate the force, and the discussion remains unresolved as participants have not yet provided specific solutions or approaches to the problem.

Contextual Notes

The discussion lacks specific mathematical formulations or assumptions that could clarify the problem further. Participants have not yet detailed their understanding of the mechanics involved.

serbring
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Hi guys,

I have a scissor linkage and I should calculate the force F for keeping the system in equilibrium in a specific position. The force must be applied in the the middle joint as you can see in the following picture:

http://imageshack.us/photo/my-images/810/scissordisegno.png/

L is the arms lenght, instead a is the horizontal distance between the two joints. How can I calculate this force for a specific height and supported weight? Any suggestions, or links are appreciated.

Thanks
 
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