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rip cut
In woodworking, a rip-cut is to sever or divide a piece of wood parallel to the grain. The other typical type of cut is a ''cross-cut'', a cut perpendicular to the grain. Unlike cross-cutting, which shears the wood fibers, a rip saw works more like a series of chisels, lifting off small splinters of wood. The nature of the wood grain requires the shape of the saw teeth to be different thus the need for both rip saws and crosscut saws; however some circular saw blades are ''combination blades'' and can make both types of cuts. A rip cut is the fundamental type of cut made at a sawmill.
==Definitions==
''Rip cut'' comes from ''rip'': to split or saw timber in the direction of the grain, and ''cut'': to divide with a sharp-edged instrument.〔"Rip v. 2." def. 2.a., "cut v." def. 7.a., "rive v.1." def. 4 and "kerf" def 2.a. ''Oxford English Dictionary'' Second Edition on CD-ROM (v. 4.0) © Oxford University Press 2009〕
Wood may also be split along the grain (riven), but the split will follow the grain and usually not be flat. Knots also prevent riving thus the need for rip cuts. A ''kerf'' is the opening in the wood made by the saw.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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