Problem understanding the forces applied to a threaded fastner

  • #1
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TL;DR Summary
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!
 
  • #2
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.
 
  • Informative
Likes Amaelle and berkeman
  • #3
PR and PL correspond to the torque required to turn the screw (and lift or lower the load).
 
  • #4
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
 
  • #5
PR and PL correspond to the torque required to turn the screw (and lift or lower the load).
thank you I got it now!
 
  • #6
@Amaelle
I just thought I would provide a good reference on threads. See attached .pdf file
 

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  • MS-13-77.PDF
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  • #7
@Amaelle
I just thought I would provide a good reference on threads. See attached .pdf file
thanks a million!
 
  • #8
thanks a million!
You're welcome. Hope it will be useful in your future.
 

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