Finding the force acting on the helix of the thread

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SUMMARY

The calculation of the force acting on the helix of a thread when using a torque wrench is critical for understanding the mechanics of fastening. Given a torque of 100 ft.lbs and a helix angle of 0.67 degrees, the force can be derived using principles from mechanical engineering. It is essential to note that assuming no friction is unrealistic, as friction plays a significant role in maintaining the tightness of nuts and screws. For detailed calculations and methodologies, refer to "Shigley's Mechanical Engineering Design" and resources on power screws.

PREREQUISITES
  • Understanding of torque and its application in fastening
  • Knowledge of helix angles and their impact on force distribution
  • Familiarity with mechanical engineering principles, specifically in machine design
  • Basic concepts of friction and its role in screw threads
NEXT STEPS
  • Study the mechanics of torque and its effect on screw threads
  • Learn about the calculations involved in power screws
  • Review "Shigley's Mechanical Engineering Design" for comprehensive insights
  • Explore online resources about friction in fastening applications
USEFUL FOR

Mechanical engineers, students in machine design, and professionals involved in fastening and assembly processes will benefit from this discussion.

deepaknatraj
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How do I find the force acting on the helix of a thread.

Say if I'm using a torque wrench to tighten a nut and compress a gasket between nut and a mating piece and give 100 ft.lbs of torque how much of it will be available on the helix of the thread (say a helix angle of 0.67 degrees). Assumption would be no friction.

Can someone help me with this calculation?

Thanks
 
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