Each ellipse with its three dragging points represents a shaft segment. You can change the diameter and drag the ellipse perspectively into a solid (segment). When you click on the button next to the entry field for the diameter, the diameter of the ellipse is reset to that of the last segment. When you click on New, the work on the segment is complete. The Delete button deletes the most recently created segment. Every time the button is clicked a further segment is deleted.

The variation of the segment can be selected from the pop-up menu. As long as the segment is active, you can change the dimensions as much as you like. Most of the segment's dimensions can be changed directly via the dragging points. These and all other dimension changes can be entered in the entry fields. On the active segment, you also have the option of changing from one variation to another.

If you have clicked on New, the ellipse with the dragging points becomes a new shaft segment.

On the next few pages, you will find the variations.

Using the technical drawing, you will see easily which letters belong to which dimensions in the associated entry field.