framemiddenlijn
Framemiddenlijn is a Dutch term that refers to the centerline of a frame. In practice it denotes the vertical or horizontal reference line that runs through the middle of a frame, opening, or related construction element. The concept is used across architecture, carpentry, and window or door manufacturing to ensure symmetry, alignment, and consistent spacing.
In technical drawings and building plans, the framemiddenlijn serves as a reference axis for locating components
In practical construction and installation work, the framemiddenlijn is established by measuring the overall dimensions of
The concept also appears in furniture making and window manufacturing, where central alignment of structural members