Chain saw

Chain saws can inflict painful wounds.

A chain saw is a hand-held powered cutting tool. It is most often employed cutting wood, but can be used for other purposes, like cutting sculptures from blocks of ice.

The three main components, are the engine, a chain, similar to a bicycle chain, except with sharp cutting blade fixed to it, and a grooved blade whose purpose is to hold the chain, as it rotates. Some chain saws use electric motors, but a 2-stroke engine is typical.

Chain saws come in a variety of sizes.

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  This electric chainsaw is so small it can be weilded by just one hand
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  chainsaws powered by a 2-stroke engine require oil to be mixed with the gasoline, to keep the engine lubricated.
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  This chainsaw seems to be used to cut stone, or concrete
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  soldiers, using chain saws, dispose of debris, after Hurricane Sandy
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  An artist uses a chainsaw to make an ice sculpture
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  Wood carving with a chainsaw.
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