There are two main types of automotive tools used in the shop. One type is called "hand tools" because the hands are used to operate them. The pliers are a good example of a hand tool. The other type is called "machine tool ore power tools." Electricity, compressed air or dydraulic pressure supplies the power for these tools. An example of machine tool that is electrically powered is the valve grinder. The valve grinder has an electric motor that spins a grinding wheel. Tools using compressed air for power are called pneumatic tools. Pneumatic pertains to air. The air wrench, used to remove and replace axle-flange nuts, is an example.
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