Mech Engineering Four-Bar Linkage Angle Question

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SUMMARY

The discussion centers on a mechanical engineering problem involving a crank rocker four-bar linkage design. The user has selected specific side lengths and is attempting to calculate the angles as the crank moves in 30-degree increments. The user observes that the sum of the angles starts at 180 degrees and increases to 540 degrees, raising questions about the correctness of their calculations. The user confirms that the lengths adhere to the four-bar linkage condition of l1 + l2 < l3 + l4.

PREREQUISITES
  • Understanding of four-bar linkage mechanisms
  • Familiarity with angle calculations in mechanical systems
  • Knowledge of crank rocker configurations
  • Basic proficiency in plotting angles and interpreting geometric relationships
NEXT STEPS
  • Study the principles of four-bar linkage analysis
  • Learn about the Grashof condition for four-bar linkages
  • Explore methods for calculating angles in crank-rocker mechanisms
  • Investigate software tools for simulating four-bar linkages
USEFUL FOR

Mechanical engineering students, design engineers, and anyone involved in the analysis and design of four-bar linkage systems.

chronie
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Homework Statement



I have a design problem where I have to design a crank rocker and find all the angles. I have already chosen my sides. The crank will move in increments of 30* up until 360.

Homework Equations



**Please see the attachments

The Attempt at a Solution



I have plugged in my values, however when I plot all my angles they do not all equal 360 degrees. If I am correct don't all four of my angles have to be 360 degrees?

In fact the sum of my angles start at 180, increase in increments of 30degrees until 540degrees.

All my sides have obeyed the l1+l2<l3+l4. Can someone explain to me if this is correct or what I am doing wrong.Much Thanks,-c
 

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Sorry I forgot to add a picture of the crank
 

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