Tool Feature: Cordless Impact Drivers
Rapid-fire rat-a-tat-tat delivers driving force
Like a typical drill, an impact driver relies--at least initially--on the tool's motor and gearing to turn the chuck for drilling or driving. When the going gets tough, though, an impacter switches modes to engage the hammer-and-anvil system, shown at right, to kick its rotational power into overdrive. In impact mode, the chuck rotates much slower but with much greater torque. (Watch a free video that demonstrates this action in motion.)
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