Problem understanding the forces applied to a threaded fastner

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SUMMARY

The discussion clarifies the confusion surrounding the forces applied to a threaded fastener, specifically distinguishing between a threaded fastener and a 'Power Screw.' The terms PR and PL refer to the torque required to turn the screw while lifting or lowering a load. The original poster initially misunderstood these forces, believing only the applied force F was relevant. The conversation emphasizes the importance of accurate diagrams in understanding mechanical concepts.

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Mechanical engineers, students in engineering disciplines, and professionals involved in the design and analysis of fastening systems will benefit from this discussion.

Amaelle
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Threaded fastner
Greeting I have a problem understanding the forces applied to a threaded fastner
1636383873013.png

I really don't understand from where they got Pr or PL because for me the only applied force is F
thank you!
 
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The confusion is probably because the diagram isn't for a threaded fastener - it's for a 'Power Screw.' The screw is raising (or lowering) a load - that's where the 'mystery' forces come from.
 
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PR and PL correspond to the torque required to turn the screw (and lift or lower the load).
 
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Dullard said:
The confusion is probably because the diagram isn't for a threaded fastener - it's for a 'Power Screw.' The screw is raising (or lowering) a load - that's where the 'mystery' forces come from.
thank you very much
 
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onatirec said:
PR and PL correspond to the torque required to turn the screw (and lift or lower the load).
thank you I got it now!
 
@Amaelle
I just thought I would provide a good reference on threads. See attached .pdf file
 

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dlgoff said:
@Amaelle
I just thought I would provide a good reference on threads. See attached .pdf file
thanks a million!
 
Amaelle said:
thanks a million!
You're welcome. Hope it will be useful in your future.
 
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