Shakes are cracks in timber. Arising in cut timber they generally cause a reduction in strength. When found in a log they can result in a significant amount of waste, when a log is converted to lumber. Apart from heart shakes, often found in trees felled past their best, shakes in a log have no effect on the strength of shake … See more Heart shake is a crack in the heartwood, near the centre of the tree. It is caused by poor seasoning, or by using trees felled past maturity. See more Frost shake begins on the outside where moisture from rain or other means has penetrated, and freezes, causing damage to the wood on the … See more Thunder shake is across the grain, and hard to detect until the boards are being planed. It is caused by shock to the wood, such as thunder, or concussion during felling. This fault seriously weakens the timber. See more A crack or cracks propagating from near the edge of the log towards the centre, usually along the line of the medullary rays, causing the wood … See more A cup or ring shake follows the line of annual rings. The separation of the rings is generally caused during the growth of the tree, either by a check in the growth, or by bending and … See more • Dry rot • Knots (wood) • Wandering heart • Wood drying See more WebCup - 'cupping' is a hollowing of the board throughout its length on its Bark side face: it is for this reason that solid timber window sills, for example, should be positioned 'heart side …
Defects in timber -- natural force - SlideShare
WebJan 10, 2024 · So for any woodland owner it can have a devastating effect on income through timber quality degradation. Shake, as will be apparent later in this article, means that the wood can just fall apart after it has been milled. With ring shake the tree splits (whilst growing) around an annual growth ring so that when milled a board will just fall … WebCup (Cupping) The curvature of a piece of sawn timber across its width. Diamond (Diamonding) A distortion due to differential shrinkage in drying that causes a piece of timber originally square (or rectangular) in cross … how many songs does niziu have
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WebApr 18, 2015 · THEY ARE USUALLY FORMED DUE TO EXTREME HEAT OR SEVERE FROST DURING THE GROWTH OF THE TREE. CUP SHAKE - IT APPERS AS CURVED SPLIT WHICH PARTLY OR … WebJan 13, 2024 · Cup shakes or ring shakes are a separation between the annual rings and are normally the result of lack of nutriment. It is also said to be caused by the rising sap freezing during early spring cold spells. Waney edge is where the bark is left on the edge of converted wood. Knots are the end sections of branches where they grow out of the trunk. WebThe meaning of RING SHAKE is a defect in timber consisting of shrinkage and separation of the annual rings —called also cup shake. a defect in timber consisting of shrinkage … how did ravana trick sita away from rama