defects in lumber
DESCRIPTION
Defects In Lumber. Manufacturing II. Defects. Crook Warping along the edge from one end to the other. Defects. Bow A curve along the face of a board from end to end. Defects. Cupping Warping along the face of a board across the width of the board. Defects. Twist - PowerPoint PPT PresentationTRANSCRIPT
Defects In LumberManufacturing II
Defects Crook
› Warping along the edge from one end to the other.
Defects Bow
› A curve along the face of a board from end to end.
Defects
Cupping› Warping along the face of a board
across the width of the board.
Defects
Twist› Warping in lumber where the
ends twist in opposite directions.
Defects
Loose Knot
Tight Knot
Defects
Loose Knot Tight Knot
Defects Split
› A longitudinal separation of the fibers which extends to the opposite face.
Defects
Checking› A crack in the wood structure of a
piece, usually running lengthwise.
Defects Wane
› bark or absence of wood on corners
Defects Pitch Pocket
› An accumulation of sap on the surface or in pockets below the surface of wood.
Defects Grub Hole
› One 1/4 inch in diameter or larger.
Defects
Machine/Burn Marks› Discoloration and roughness to the
wood