General about the Geometry of Cutouts

In most cases a cutout is built up by lines, parallel to the different line segments of the profile sections. At node points these lines are connected to each other, for example, by fillets or directly by knuckles. The cutout is thus defined by the distances (clearances) of these lines and the radii, connecting them.

The node points are numbered and they are individual to each profile type. The figure below shows the points and their numbers. (Except for tight cutouts a bulb bar is 'replaced' by an 'enclosing' L-bar (profile type 31) in the evaluations).

Figure 2:1. Node numbers for different profile types.

U-bars (profile type 50) are treated as L-bars (profile type 31) in all those profile types where they are supported.