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