Abstract: A floorboard assembly comprises first and second solid wood floor boards (10) and (12). The first floor board (10) has a tongue (14) extending longitudinally along a first side thereof. The second floor board (12) having a groove (16) extending longitudinally along a second side thereof. The groove (16) has a width defined between a top lip (22) and a bottom lip (24). The tongue (14) is insertable in a tight fit manner in the groove (16) to prevent translational separation of the boards (10, 12) in a common plane thereof. A clearance (26, 26?, 28, 32, 32?, 32?, 36 and 38) is provided between the tongue (14) and the groove (16) at one of a tip portion of the tongue (14) and an outermost portion of the top and bottom lips (22, 24) of the groove (16). The clearance (26, 26?, 28, 32, 32?, 32?, 36 and 38) is configured to allow angular withdrawal of the tongue (14) from the groove (16) by manually pivoting the first and second floor boards (10, 12) towards one another in one of an upward and a downward direction.

Abstract: The undersurface (22) of the floorboards (10) is used as a main reference for taking measurements in a tongue and groove floorboard quality control process. The process comprises measuring at least one distance (X, Y) between the undersurface (22) and a downwardly facing surface of at least one of a tongue and a groove profile of selected ones of the floorboards (10). Measurements can be taken from the undersurface (22) of the selected boards (10) on both sides thereof to vertically adjust the relative position of groove cutter head (18) and the tongue cutter head (16) of the molding machine (M) used to manufacture the boards (10). A depth gage (G) can be used to take the measurements.