Rules for Calculation

These special frame templates are generated as described below. The picture shows schematically how they are used and also the vocabulary used for them (which differs somewhat from the standard vocabulary).

Flexible frame templates

• The upper edges of the templates (when still treated as physical templates, cf. the main document) are located in a base plane (otherwise called the sight plane). The base plane is selected so that it is parallel to the line between the midpoints of the two next outermost template curves and so that the difference in distance to the plate corners is minimized.

• A sight line plane is calculated as perpendicular to the base plane and approximately in the middle of the plate (and the template curves).

• The base plane is then moved so that the distance along the stand from the template midpoint to the base plane becomes 600 mm (for the same two templates). The line of intersection between the base plane and the sight line plane is called the sight line. The distance along all stands to this line is output in the resulting list.

• The frame closest to the middle of the plate is called the base frame.

• If the base seams are in frame planes templates will be generated along these seams. If the next frame template is too close, that frame template will be skipped (see Flexible Frame Templates and Control Information for Manufacturing Curved Plates).

• The intersection curve between the sight line plane and the plate (M-line in the figure above) will be marked on the plate (at the same time as other marking is added).

• The angle between the template and the M-line will be calculated on the forward side.