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1/2-Inch Hammer Drill Operator's Manual 13
OPERATION:
Operation
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. Operation of switch:
a. The drill speed can be adjusted from O 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.
b. 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. When using as a Drill or a Hammer Drill:
a. 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.
b. 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.
c. 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.