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Stress Area of General Purpose Acme Threads Question
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Posted by: johnnytejas

12/10/2010, 12:46:12

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Hello All, I've been to the Engineers Edge website many times over the years, and it has been extremely helpful. I can't however find what I am looking for here, which is basically peace of mind. Currently designing a part with a 7" ID, capped with a flat bottom cap, designed with 8.0" 1/3 pitch General Purpose Acme Threads. What we are wanting to be sure of is the length of thread we need so that they don't shear under 45,000 PSI of static pressure. According to the equation for shear area of Acme threads in the Machinist handbook, our length of 4.5" will shear under a pressure of approx. 57000 psi. Any help would be greatly appreciated.







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: Stress Area of General Purpose Acme Threads
: Stress Area of General Purpose Acme Threads -- johnnytejas
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Posted by: jbeckproe

12/14/2010, 10:21:53

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can you use a different pitch? more threads = less thread length, in most cases.Or try using a 4G and see how the numbers work out.

When I work with threads I usually design the thread around the part.








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