Regarding the issue of thread size, how should threads with a nominal diameter exceeding 300 mm be designed?
Thread Content
Recent designs have involved the selection of thread types; ordinary threads would suffice. However, after checking the thread standards, it turns out that the maximum nominal diameter for ordinary threads is 300 mm, while my structure requires threads with a diameter of 320 mm. How should this be addressed in the design? I searched online and found no relevant information. I wonder: is it possible to proceed with the design directly by using the calculation method for threads, based on 320mm? Or are there no such large standard threads, and do I need to make structural changes? Please, experts, thank you. I’m waiting online. .
Is it possible to reduce 320 to below 300 (equivalent to welding a reducing fitting), and then proceed with standard procedures?
It is difficult to screw on due to the large diameter. It’s not necessary to follow that strictly; you just need to specify the pitch, tooth profile, and tolerances
You can design it according to a pitch standard of 300, but you need to consider the magnitude of the tightening force in order to determine the pitch (the thickness of the threads).
Haha, large threads are the same as small threads; once you know the pitch and thread profile, you can machine them.
It’s not possible to do that. . Structural constraints. .
I checked the mechanical design manual; it lists threads of 320mm, with a maximum of 600mm. Thank you all
Large threads are the same as small threads
This post was last edited by “Newbie Mastering Haichuan” on June 21, 2015, at 20:56. The threads on a large tube sheet are the same as those on a small one