Schiefe geschlossene Strahlschraubfläche (Korkziehergewinde)

Kurzbeschreibung: The model shows a part of the so-called "sharp screw" or "corkscrew surface". The generating lines intersect its axis and are inclinied towards it. The surface is limited by a coaxial right circular cylinder, the radius of which is chosen such as to make the edge of the surface meet the lateral area of the cylinder.