Hi Zooen,

You might also like to look into the more modern application of this concept, called a ball screw and used in precision locating, for example machine tools.
https://en.wikipedia.org/wiki/Ball_screw

--Larry

Hi Barry,

In my opinion, the screw is integral with the support and it is the hourglass that we turn by hand. Maybe my en / fr and fr / en translations are playing tricks on me!

Here is the answer of Mr. Albert Karlen (on the site the area of the wood).
to Pilou's question: How does the Archimedean screw turn? by hand or by a motor, or simply by turning, or ...?

The screw does not turn, it is the hourglass which turns around the screw which it is integral with the support, in the state it is done manually but one can imagine adding a motor ...

- Zooen

Barry,

I tried to reply to your private message, but my PM won't send (it is stuck in "outbox"). Not sure what the issue is, but thought I'd try posting here instead.

I have attached NOD file based on your's.

Is this what you needed?

James
https://www.instagram.com/nodeology/

Hi James,
thank you works great.
I have added the option of duplicating and rotating the sweep to give a 2 start spiral.
Also an offset option of the revolved curve thus to retain the balls.
Finally boolean difference to complete it all in the Nodeditor.
Anyway again many thanks.
Barry
Happy new year.
Edit added second shape.

Cool! :)