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Parametric Sinusoidally Dented Cylinder

A parametric cylinder sinusoidally dented along the Z axis.

Can be used as:

Star exclamation style shape
Gears: helical or straigth.
Very smooth run as long as relatively same nr of teeth
But intolerant to dirts as the teeth nearly fully engage
Planetary gears: helical or straigth.
Threaded shaft + corresponding tube
Decorative object

Dented surface on the inside
Left/Right constant angle twist added
Round surface down to a polygon for torque transmission”

Link to article

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