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Quartersawn oak was a key feature of the decorative style of the American Arts and Crafts movement, particularly the work of Gustav Stickley, who said "The quartersawing method of cutting... renders quartersawn oak structurally stronger, also finer in grain, and, as shown before, less liable to warp and check than when sawn in any other way."
Wood is a highly anisotropic material (its strength varies considerably with the direction of applied force, i.e., parallel, radial, or tangential to the grain). Because wood is strongest when loaded in tension or compression along the grain, the best knees are those in which the wood grain follows the bend.
A common use of Janka hardness ratings is to determine whether a species is suitable for use as flooring. For hardwood flooring, the test usually requires an 80 mm × 150 mm (3 in × 6 in) sample with a thickness of at least 6–8 mm, and the most commonly used test is the ASTM D1037.
The "quarter" system of reference is a traditional North American lumber industry nomenclature used specifically to indicate the thickness of rough sawn hardwood lumber. In rough-sawn lumber it immediately clarifies that the lumber is not yet milled, avoiding confusion with milled dimension lumber which is measured as actual thickness after ...
Rip cuts are commonly made with a table saw, but other types of power saws can also be used, including a radial arm saw, band saw, and hand held circular saw.In sawmills the head saw is the first rip-saw a log goes through, which is sometimes a gang-saw, and then the cants may be resawn using other saws and then edged in an edger and sometimes cut to length by a crosscut saw.
Rock Structure Rating (RSR) is a quantitative method for describing quality of a rock mass and appropriate ground support, in particular, for steel-rib support, developed by Wickham, Tiedemann and Skinner. [1] [2] [3] The RSR concept introduced a rating system for rock masses. It was the sum of weighted values in this classification system.
Odsus1 00:21, 22 October 2018 (UTC)The description of rift sawn in this article is absolutely incorrect, rift sawn is defined as sawing a log in a manner where the grain is between 30-60 degrees to the flat face of the board and is not rare at all, quarter sawn is defined as 60-90 degrees to the flat face of the board.
The name "quarterstaff" is first attested in the mid-16th century. The "quarter" possibly refers to the means of production, the staff being made from quartersawn hardwood (as opposed to a staff of lower quality made from conventionally sawn lumber or from a tree branch). [2]