Calculate forces on a double scissor jack

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SUMMARY

The discussion centers on calculating the maximum forces in a double scissor jack assembly, focusing on the balancing forces necessary to prevent structural collapse. The user seeks guidance on whether considering only the weight forces at the top is a valid assumption and expresses interest in determining the maximum stress to select an appropriate cross-section for the components. Key equations and previous discussions are referenced to aid in the analysis of forces within the assembly.

PREREQUISITES
  • Understanding of static equilibrium principles
  • Familiarity with force analysis in mechanical systems
  • Knowledge of stress and strain concepts in materials
  • Experience with scissor jack mechanics
NEXT STEPS
  • Research static equilibrium equations for multi-body systems
  • Learn about stress analysis techniques for mechanical components
  • Explore force distribution in scissor jack mechanisms
  • Study material selection criteria based on stress calculations
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Mechanical engineers, students studying mechanics, and anyone involved in the design and analysis of lifting devices will benefit from this discussion.

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Homework Statement


Find maximum forces in one given jack assembly. If I don't make it any easier, I will have 15 unknown forces, so I tried to just take the weight forces at the top...is it an okay assumption? If not, what should I do? My attempt on a solution is underneath. Thanks for tips and answers.
jack.png

Homework Equations


They are given in the picture below.

The Attempt at a Solution


calc.png
 
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There have to be balancing forces somewhere - the stand as shown would just collapse .

Do you want to work out the forces in each link or just the ratio between input force and lifting force ?

Have you seen this earlier thread ?
 
Last edited:
Nidum said:
There have to be balancing forces somewhere - the stand as shown would just collapse .

Do you want to work out the forces in each link or just the ratio between input force and lifting force ?

Have you seen this earlier thread ?
I'm sorry, I have a motor that holds the bar between the jacks together, so it is a force F holding the lower right leg in place. I'm most interested in finding where and how big the maximum stress is, so I can choose the right cross section for it.
 

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