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7
OPERATION
Hammer drilling operation
CAUTION:
• There is a tremendous and sudden twisting force
exerted on the tool/bit at the time of hole break-
through, when the hole becomes clogged with
chips and particles, or when striking reinforcing
rods embedded in the concrete. Always use the
side grip (auxiliary handle) and firmly hold the tool
by both side grip and switch handle during opera-
tions. Failure to do so may result in the loss of con-
trol of the tool and potentially severe injury.
When drilling in concrete, granite, etc., move the action
mode changing knob to the position of symbol to use
“rotation with hammering” action.
Be sure to use a tungsten-carbide tipped bit.
Position the bit at the desired location for the hole, then
pull the switch trigger. Do not force the tool. Light pres-
sure gives best results. Keep the tool in position and pre-
vent it from slipping away from the hole.
Do not apply more pressure when the hole becomes
clogged with chips or particles. Instead, run the tool at an
idle, then remove the bit partially from the hole. By
repeating this several times, the hole will be cleaned out
and normal drilling may be resumed.
NOTE:
Eccentricity in the bit rotation may occur while operating
the tool with no load. The tool automatically centers itself
during operation. This does not affect the drilling preci-
sion.
Blow-out bulb (optional accessory)
After drilling the hole, use the blow-out bulb to clean the
dust out of the hole.
Drilling in wood or metal
Use the optional drill chuck assembly. When installing it,
refer to “Installing or removing drill bit” described on the
previous page.
Hold the ring and turn the sleeve counterclockwise to
open the chuck jaws. Place the bit in the chuck as far as
it will go. Hold the ring firmly and turn the sleeve clock-
wise to tighten the chuck.
To remove the bit, hold the ring and turn the sleeve coun-
terclockwise. Set the action mode changing knob to
“rotation only”.
You can drill up to 13 mm diameter in metal and up to
24 mm diameter in wood.
Never use “rotation with hammering” when the drill chuck
assembly is installed on the tool. The drill chuck assem-
bly may be damaged.
Also, the drill chuck will come off when reversing the tool.
CAUTION:
• Pressing excessively on the tool will not speed up
the drilling. In fact, this excessive pressure will only
serve to damage the tip of your bit, decrease the
tool performance and shorten the service life of the
tool.
• There is a tremendous twisting force exerted on the
tool/bit at the time of hole breakthrough. Hold the
tool firmly and exert care when the bit begins to
break through the workpiece.
• A stuck bit can be removed simply by setting the
reversing switch to reverse rotation in order to back
out. However, the tool may back out abruptly if you
do not hold it firmly.
• Always secure small workpieces in a vise or similar
hold-down device.
Diamond core drilling
When performing diamond core drilling operations,
always set the change lever to the position to use
“rotation only” action.
CAUTION:
• If performing diamond core drilling operations using
“rotation with hammering” action, the diamond core
bit may be damaged.
1. Blow-out bulb
1. Keyless drill
chuck
2. Chuck adapter
1
001302
1
2
007236
1. Sleeve
2. Ring
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2
007237