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riving knife
A riving knife or splitter is a safety device on table saws, circular saws and radial arm saws used for woodworking. While comparable in their safety function, they are different devices, each with its pros and cons.
Splitters are fixed in relation to the saw table, riving knives are fixed relative to the blade and move with it as blade depth is adjusted.
== Function ==
Table saws are typically used for two functions - cross-cutting and ripping. Cross-cutting is slicing a board across its width and across the grain of the wood. Ripping is cutting a board lengthwise, along the grain. As wood is ripped, but before the two pieces are completely separated, pre-existing stresses in the wood are released. The partially cut board may move, twist, or very commonly the gap or kerf closes up and the two separate halves of the cut press together and jam around the saw blade.
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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