Analyse the cutting force of this bolt cutter

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SUMMARY

The discussion focuses on calculating the cutting force exerted by a bolt cutter when 250 N is applied on both sides of the plier. Participants emphasize the importance of including all relevant fulcrums in the force diagram, specifically the second fulcrum located 70mm from the workpiece and additional pivots 230mm from the work. The Principle of Virtual Work is recommended as a method to analyze the force distribution effectively. Accurate force calculations require a comprehensive free body diagram (FBD) that incorporates all mechanical elements involved.

PREREQUISITES
  • Understanding of force diagrams (FBD)
  • Familiarity with the Principle of Virtual Work
  • Basic knowledge of mechanical advantage in lever systems
  • Experience with force calculation methods in physics
NEXT STEPS
  • Study the Principle of Virtual Work in mechanical systems
  • Learn how to create and analyze Free Body Diagrams (FBD)
  • Research mechanical advantage calculations for lever systems
  • Explore advanced force calculation techniques in physics
USEFUL FOR

Mechanical engineers, physics students, and anyone involved in the design or analysis of lever systems and cutting tools will benefit from this discussion.

BiostudentWouter
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Homework Statement
force calculations
Relevant Equations
Determine the force created due to the compression of the plier
Schermafbeelding 2020-01-17 om 20.26.14.png

The question is to determine the force in the small opening, delivered from the 250 N on both sides of the plier.
i tried multiple things but can't get the answer right. Anyone that could help me?
This is my work so far:
IMG_4362.jpg
 
Last edited:
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Welcome to the PF. :smile:
BiostudentWouter said:
Homework Statement:: force calculations
Homework Equations:: Determine the force created due to the compression of the plier

View attachment 255743
The question is to determine the force in the small opening, delivered from the 250 N on both sides of the plier.
i tried multiple things but can't get the answer right. Anyone that could help me?
We cannot help you until you show your work so far. Please post your FBD and show your calculations that you have tried. Thanks.

EDIT -- it looks like you've gone back and posted your initial calculations. Thank you. :smile:
 
Last edited:
This would be an excellent place to employ the Principle of Virtual Work.
 
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haruspex said:
Your diagram omits the second fulcrum, the one 70mm from the workpiece.
This is an essential part of the mechanism.

Yes, and there are two more pivots 230mm from the work that the force diagram appears to treat as rigid.
 

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