POWER SCREWDRIVERS
V. Ryan © 2006
Everyone has used a manual screw driver to turn a
screw that refuses to move or one that is very difficult to turn. The
result is a sore or blistered hand. Power screwdrivers are the answer
especially if a large number of screws need to be fixed in position. |
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1. The
screwdriver blade is dangerous. Both hands should be behind the blade
whilst it is turned. Never, place a hand in front or alongside the
blade. If the blade slips it can tear into flesh, producing a nasty
injury. |
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Depending on the model and make of power screwdriver, the handle will have two positions. The handle can be locked in a level position as shown in the diagram above OR it can be locked into a vertical position. |
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Power Screwdrivers are usually variable speed and
torque. The example below has a speed control disc on the ON/OFF button.
Pressing the top of the ON/OFF button turns the chuck and screwdriver
blade in a clockwise direction. Alternatively, pressing the bottom of
the ON/OFF button turns the chuck in an anti-clockwise direction. |
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Safety / self-locking chucks are very common. These to not need a chuck key and are used by simply turning the chuck and the barrel by hand, in opposite directions. The screwdriver bit locks in position. |
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To charge most power screwdrivers, simply plug them into the mains. On some models a red indicator light will show when the internal battery is charging. When charging is complete (1 to 3 hours) the green indicator light will show. Then the screwdriver can be disconnected from the mains and used. |
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