Presentation on theme: "Timber Defects. Knots A hard cross grain mass of wood that is formed in the trunk of a tree where a branch grows. Knots spoil the appearance and reduce."— Presentation transcript:
Knots A hard cross grain mass of wood that is formed in the trunk of a tree where a branch grows. Knots spoil the appearance and reduce the strength properties of wood. It also raises the seasoning defects and makes difficulties during wood working.
Gum Pockets Cracks in the timber which contain gum.
Shakes A Shake is a partial or complete separation between the adjoining layers. Maybe caused by growing stresses in the tree or by the impact of the tree with the ground during felling
Cup Sahkes Separation of wood fibres around the growth rings
Felling Shake Are fractures across the grain in which the fibres are broken transversely or are crushed by compression. Various causes are suggested, such as felling across obstructions, and failure inside the growing tree caused by high winds.
Cupping A concave curvature across the face of a board. Curvature is usually away from the centre of the tree.