There are many kinds of saw. Some of them are hand tools that work withmuscle power, like the saw in the picture. Some saws have other sources of power and can be very powerful, such as achainsaw that is used to cut downtrees.
The work carried out with a saw is usually noisy. Using a saw to cut materials isdangerous because of sharpteeth. Care must be taken not to let sharp edges touch the skin. Parts of the material being cut can fly off the work and become a hazard tobreathing, toeyes and to theskin.
A saw designed to cut down trees or cut branches from trees is a chainsaw. A chainsaw is named for the row of teeth attached to a flexible chain. The cut is often very rough and often hassplinters.
Circular saws use a round blade, usually between 7 and 10 inches. They are often very powerful and can cut through hard or soft wood. They useinterchangeable round blades.[3] The blade can be designed to cut any of a number of kinds ofmaterials from steel, to wood, tomasonry.
Jig saws move the blade up and down to cut through materials. The stroke (or up and down movement) is usually less than one inch (25.4 mm). These saws are very good for making curved cuts.[4] Jig saws use a variety of interchangeable blades for cutting different materials. Some blades make very smooth cuts.
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