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To install the bit, place it in the chuck as far as it will go. Tighten the
chuck by hand. Place the chuck key in each of the three holes and
tighten clockwise. Be sure to tighten all three chuck holes evenly.
To remove the bit, turn the chuck key counterclockwise
in just one hole, then loosen the chuck by hand.
After using the chuck key, be sure to return to the orig-
inal position.
OPERATION
CAUTION:
Always use the side grip (auxiliary
handle) and firmly hold the tool by both side grip
and switch handle during operations.
Diamond core drilling operation
CAUTION:
•
Never use "rotation with hammering" action
when drilling with a diamond core drill. The core
bit may be damaged.
When diamond core drilling, adopt the following procedure:
1.
Prior to using a diamond core bit, drill a 13 mm
pilot hole using a masonry drill bit (tungsten-car-
bide tipped hammer bit).
2.
Remove the masonry drill bit from the drill chuck.
3.
Set the change lever from "rotation with hammer-
ing" position to "rotation only" position.
4.
Install a diamond core bit into the chuck.
5.
Place the diamond core bit on drilling location so
that the center bit is inserted into the pilot hole.
6.
When drilling, always hold the tool squarely against material.
7.
Do not force the core bit, allow the core bit to do
the work. This will prolong the life of the core bit
and reduce breakage.
8.
Ensure that the masonry dust/swarf produced
during drilling is regularly removed.
Allowing the dust/swarf to accumulate will result
it overheating and excessive clutch/torque limiter
wear and the loss of segments from the core bit.
9.
When entering or leaving a hole, ensure that the
core bit is rotating.
10. If the core bit starts to vibrate and when the core
bit begins to break through material, reduce pres-
sure immediately.
11.
After use, store the core bit carefully in its box and
remember that it is a diamond core bit.
NOTE:
•
A pilot hole is not required for 22 mm and 28 mm
diameter core bits.
Hammer drilling operation
(with a tungsten-carbide tipped bit)
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 rein-
forcing 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 operations. Failure to do so may result
in the loss of control of the tool and potentially
severe injury.
When drilling in concrete, granite, tile, etc., move the
action mode changing lever to the position of
bol to use "rotation with hammering" action.
Blow-out bulb (optional accessory)
► 1. Blow-out bulb
After drilling the hole, use the blow-out bulb to clean the
dust out of the hole.
Drilling operation
(with a conventional drill bit)
When drilling in wood, metal or plastic materials, move
the action mode changing lever to the position of
bol to use "rotation only" action.
Drilling in wood
When drilling in wood, the best results are obtained with
wood drills equipped with a guide screw. The guide screw
makes drilling easier by pulling the bit into the workpiece.
Drilling in metal
To prevent the bit from slipping when starting a hole,
make an indentation with a center-punch and hammer
at the point to be drilled. Place the point of the bit in the
indentation and start drilling.
Use a cutting lubricant when drilling metals. The excep-
tions are iron and brass which should be drilled dry.
6 ENGLISH
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