Hitachi Koki USA D 10VH Drill - Manual (Page 13)

English
13
HOW TO USE
CAUTION:
To prevent accidents, make sure to turn the switch off and disconnect the plug from
the receptacle when the drill bits and other various parts are installed or removed. The
power switch should also be turned off during a work break and after work.
1. Switch operation
⅜ When the trigger switch is depressed, the
tool rotates. When the trigger is released,
the tool stops.
⅜ The rotational speed of the drill can be
controlled by varying the amount that the
Trigger switch is pulled. Speed is low when
the trigger switch is pulled slightly and
increases as the trigger switch is pulled
more.
⅜ The desired rotation speed can be pre-
selected with the speed control dial.
Turn the speed control dial clockwise for
higher speed and counterclockwise for
lower speed. (Fig. 9)
⅜ Pulling the trigger and pushing the stopper,
it keeps the switched-on condition which is
convenient for continuous running. When
switching off, the stopper can be
disconnected by pulling the trigger again.
2. Drilling
⅜ When drilling, start the drill slowly, and gradually increasing speed as you drill.
⅜ Always apply pressure in a straight line with the bit. Use enough pressure to keep
drilling, but do not push hard enough to stall the motor or deflect the bit.
⅜ To minimize stalling or breaking through the material, reduce pressure on drill and
ease the bit through the last part of the hole.
⅜ If the drill stalls, release the trigger immediately, remove the bit from the work and
start again. Do not click the trigger on and off in an attempt to start a stalled drill. This
can damage the drill.
⅜ The larger the drill bit diameter, the larger the reactive force on your arm.
Be careful not to lose control of the drill because of this reactive force.
To maintain firm control, establish a good foothold, use side handle, hold the drill
tightly with both hand, and ensure that the drill is vertical to the material being drilled.
Fig. 9
Speed
control dial
High
speed
Low speed
Stopper