The geometry of parts is defined in a table. The geometry can be defined using horizontal and vertical lines; the points (radius and y-coordinate) have to be entered clockwise. A coordinate which is not changed to the previous point can be set to zero. So the number of input values can be reduced by factor two. If the general geometry input is activated, all coordinate values have to be defined.
Using the button on the lower right additional lines can be added or deleted. The plus-button copies the selected line or appends a new line if nothing is selected. The minus-button deletes the selected line and the ross-button clears the whole table.