Recent content by mc172

  1. M

    Screw and mating thread strength equations

    I'm English and was born after metrication so pounds are quite alien to me too. I assumed this forum was largely American hence the unit choice. And the thread is in inches, so it makes sense to use pounds. Thanks for your reply - I am now confused. Are you assuming two turns of the...
  2. M

    Screw and mating thread strength equations

    Ah, yes. The nut doesn't come into contact with a mating face, instead the mating faces are stationary inside the nut using a slip-ring mechanism. Thanks, I must take the friction and effective radius into account. Is effective radius the mean diameter of the contact surfaces? Thanks.
  3. M

    Screw and mating thread strength equations

    I am designing a mating male and female threaded interface, where the nut is much weaker than the male thread. I need to be able to calculate a few things: A. The maximum force (as preload) required to reach the yield point of the nut material. B. The torque required to achieve the above. The...
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