Page 2 of 2 FirstFirst 1 2
Results 21 to 22 of 22

Thread: Thread length calculations - how much pressure can be applied before stripping?

  1. #21
    Lead Engineer
    Join Date
    Aug 2013
    Location
    Houston TX USA
    Posts
    421
    The basic shifting equation is determining the difference between the Kn diameter (where the 1/4n length exists) and the desired diameter of the stress calculation; so Kn must always be the reference diameter to which you are adjusting the [1/4n+2*tan(30deg)*(Esmin-Knmax)] shift. Put another way 1/4n is permanently linked to Kn so that diameter must always be the reference diameter to which any adjustments are made to get a new thread length.
    Last edited by JAlberts; 06-25-2018 at 06:46 PM.

  2. #22
    Associate Engineer
    Join Date
    Jun 2017
    Location
    Ft Worth, TX
    Posts
    5
    Thank you JAlberts, I finally got it. I wasn't using the width of the thread form at the pitch diameter (the 1/2n term) as the starting wdth and I was using the wrong equation for the internal (nut) threads. I have equations for Buttress threads now!

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •