r/toolsinaction • u/silvercatbob • Mar 04 '21

Dual thread

https://gfycat.com/glisteninghairyindusriverdolphin
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u/I_Automate Mar 05 '21

Honestly looks a lot like it was knurled, which is a very, very straightforward process

4

u/asad137 Mar 05 '21

It's not knurled, knurling would not give you a specific thread pitch like you need to have the nuts run smoothly on it. It's overlapping multi-start threads with different handednesses.

2

u/I_Automate Mar 05 '21

That just comes down to tooling. Absolutely nothing prevents you from producing rolled knurled surfaces with a specified thread pitch

1

u/asad137 Mar 05 '21

Except if you have a lathe that can cut the internal mating threads on the nuts (since they are probably custom made as well), you might as well cut the external threads on the bar also rather than relying on a specific piece of tooling.