However, this tool has a different trick up its sleeve: the addition of a clutch. Modern versions offer greater flexibility with variable speed.Ī cordless drill/driver has the simplest action, in that it is purely rotational without any additional force. Early impact drivers were very much brute force, all-or-nothing tools.
Thus the focus of the force is to drive screws and other fasteners, or indeed undo them. It makes a similar sound to a hammer drill, but the energy goes in the same direction as the chuck rotation, not in a straight line along the drill bit. It is compressed every half turn then releases, delivering tremendous force. Inside the impact driver body is a heavy-duty spring.
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