How To Use - Hitachi DV 20V2 Instruction Manual

HOW TO USE
1 Speed adjustment and switch operation
O The drill speed can be adjusted from 0 through full speed by regulating the
trigger-squeezing force. The more the trigger is squeezed, the faster the drill rotates.
When the trigger is squeezed fully, the speed is the maximum.
O Pulling the trigger switch 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. When using as a Drill or a Hammer Drill
(1) Pressing force of the drill
You cannot drill holes more quickly even if you press the drill with a stronger force than
necessary. It not only damages tip of drill bits and decreases the efficiency of operation,
but also shortens the life of the drill.
(2) In case of penetrating holes
Drill bits can be broken when the material being drilled is penetrated. It is important
to decrease pressing force just before penetrating.
CAUTION
In continuous operation, conduct no-load operation for five seconds after completing
a drilling job.
(3) When a thick drill bit is used
Your arm is subjected to larger reaction force when a thicker drill bit is used. Be careful
not to be moved by the reaction force. For this, establish a foothold, hold the unit tightly
with both hands perpendicularly to the material being drilled.
3. When driving machine screws
When the trigger switch is pressed, the motor starts. The drill rotates by attaching the
bit to the groove of screw head, and by pushing the head together with the driver main
body, it tightens the screw.
CAUTIONS
O Exercise care not to excessively prolong driving time, otherwise, the screws may be
damaged by excessively force.
O Apply the screwdriver perpendicularly to the screw head when driving a screw;
otherwise, the screw head or bit will be damaged, or driving force will not be fully
transferred to the screw.
4. When driving wood screws
(1) Selecting a suitable driver bit
Employ plus-head screws, if possible, since the driver bit easily slips off the heads of
minus-head screws.
(2) Driving in wood screws
O Prior to driving in wood screws, make pilot holes suitable for them in the wooden board.
Apply the bit to the screw head grooves and gently drive the screws into the holes.
O After rotating the screwdriver at low speed for a while until a wood screw is partly driven
into the wood, squeeze the trigger more strongly to obtain the optimum driving force.
CAUTION
Exercise care in preparing a pilot hole suitable for the wood screw taking the hardness
of the wood into consideration. Should the hole the excessively small or shallow,
requiring much power to drive the screw into it, the thread of the wood screw may
sometimes be damaged.
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