<P> A riving knife is a safety device installed on a table saw, circular saw, or radial arm saw used for woodworking . Attached to the saw's arbor, it is fixed relative to the blade and moves with it as blade depth is adjusted . </P> <P> A splitter is a similar device attached to a trunion on the far side of the saw and fixed in relation to the saw table, which must be removed to make any non-through cuts or dados within the depth of the wood . </P> <P> A table saw is typically used for cross-cutting and ripping; cross-cutting slices a board across its grain width-wise, ripping cuts lengthwise along the grain . Various conditions experienced while cutting either way can cause a partially cut board to move, twist, or have the saw blade's kerf close up and bind the blade . Poor blade or fence alignment, operator error, or pre-existing stresses in the wood released by cutting may cause these different and dangerous conditions . A riving knife rides within the kerf, pivoting on the saw's arbor in relation to blade height, to maintain an even gap between the two cut sides of the board, preventing jamming which could cause the stock to be forcefully ejected rearward toward the saw's operator . </P> <P> Kickback can pull the operator's hand into contact with the saw blade, as demonstrated by Popular Mechanics . </P>

What does a riving knife do on a table saw
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