Turning a bi-directional thread bolt

A russian youtube machinist made an M40 bolt… with both left and right hand threads. The threads are clean enough that the nuts that size can self-thread under their own gravity… simultaneously in counter-rotating directions.


So, that’s witchcraft and I’m reporting it.


I have one of those workbenches just like his, i use it way more often then my other workbench where I stage tools and fasteners that I put away once in awhile and half finished projects that I fully intend on getting around to working on someday soon.


Threads were 10-start if I recall - a nice steep incline to drop.

Now I’ll be trying to print this:

Apparently inspired by the vid you posted

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