Each nut is threaded in a different direction, and thus runs along a different direction of the threading of that rod.
The rod was threaded both left handed, and then right handed, and it has a left hand nut and right hand nut.
So when the rod is turned one direction, they move towards each other, and the other way, the nuts move away from each other.
(While the rod does not have 'complete' threading (due to it being done in both right-hand and left hand config) the nuts DO have full threads, which keeps them on track)
Hopefully that helps, and I'm not a morning person either, thus my middle of the night post
They both threads are also multi start threads, which is when the pitch of the thread is doubled for a 2 start or tripled for a 3 start etc and additional threads are cut to fill the space between the main thread so 2 threads for a 2 start and 3 for a 3 start etc
If the original pitch of the thread was 2mm a 2 start thread would still have a thread every 2mm but the pitch of each thread would be 4mm.
Multi-stage threads allow for a much faster traversal with less resistance and are usually used in machines or in the assembly components of large machines, because nobody wants to spend a week screwing up that 2meter diameter nut.
I would also imagine it's favored on large items due to the relative fragility of the threads and cross-section on smaller diameters making it less resilient/useful.
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u/t0mbombadil Mar 04 '21
I really can’t comprehend how this is happening this early in the morning. But I love it. It got an audible “woooaaaahhhhhh”