Although circular saws are one of the most useful tools you can have in your toolbox, they can also be one of the most dangerous-that is, if you don't know how to use them properly.
Listen to ON CIRCULAR SAW SAFETY or read the text below:
Here are a few safety tips: First, make sure the material you're cutting is positioned correctly. For example, never attempt to cut the middle of a board whose ends are resting on sawhorses spaced apart from one another; as you're progressing with the cut, the board will likely sag and pinch the blade, causing the saw to kick back. Instead, position the sawhorses closer together and use clamps to secure the lumber.
Never try to use a circular saw to make a cut in a stud. Again, you risk a kickback. Better to use a reciprocating saw for that job. Most importantly, once you've started a cut, never attempt to lift the saw or remove it until you've released the trigger and the saw blade has come to a complete stop.
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