Rotation of one bolt around another of the same screw thread.
The question is choosing the best answer.
This problem uses two screws or bolts with the same external screw threading and handedness.
With one bolt head in each hand, engage the two bolts' threading so that the bolt shafts are parallel with each other. Then, while the threading remains engaged, rotate the bolt shafts around each other.
I deliberately am not specifying the direction of rotation of one bolt around the other.
I suggest getting two real, physical bolts or machine screws of the same size and screw threading . I suggest about 3cm length (1 inch) long and 9mm ( inch) for easy handling; but, any size will do. In particular, the bolts or machine screws have to have the same handedness.
If you want to see happens when the screw threading is the same except for handedness, then, take the hook bolts out of a turnbuckle .
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1 solution
The interesting thing is that the heads do not move relative to each other regardless of the direction of rotation of one bolt around the other.
In the turnbuckle bolt case, there is definite motion of the head to or from each other depending on the direction of rotation of one bolt around the other.