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17
OPERATION
TO ADJUST DRILLING OR HAMMER MODE
See Figure 16.
To adjust hammer drill to drilling or hammer operation, rotate
mode selector in the direction of arrows as shown in Figure
16. For your convenience a hammer symbol and drill bit
symbol have been molded into the selector.
WARNING:
Your hammer drill has not been designed for
reverse hammering. Reverse hammering may
damage your drill.
We recommend that you use carbide-tipped bits and select
hammer mode when drilling in hard materials such as brick,
tile, concrete, etc.
We recommend that you select normal drilling mode when
drilling with twist drills, hole saws, etc. in steel and soft
materials.
WOOD DRILLING
�n For maximum performance, use high speed steel bits for
wood drilling.
�n Turn mode selector ring on hammer drill to normal drilling
action.
�n Begin drilling at a very low speed to prevent the bit from
slipping off the starting point. Increase the speed as the
drill bit bites into the material.
�n When drilling through holes, place a block of wood behind
the workpiece to prevent ragged or splintered edges on
the back side of the hole.
�n Do not lock the trigger on for jobs where your hammer
drill may need to be stopped suddenly.
METAL DRILLING
n For maximum performance, use high speed steel bits for
metal or steel drilling.
n Turn mode selector on hammer drill to normal drilling
action.
n Begin drilling at a very low speed to prevent the bit from
slipping off the starting point.
n Maintain a speed and pressure which allows cutting
without overheating the bit. Applying too much pressure
will:
• Overheat the drill;
• Wear the bearings;
• Bend or burn bits; and
• Produce off-center or irregular shaped holes.
n When drilling large holes in metal, we recommend that
you drill with a small bit at first, then finish with a larger
bit. Also, lubricate the bit with oil to improve drilling action
and increase bit life.
MASONRY DRILLING
n For maximum performance use carbide-tipped masonry
impact bits when drilling holes in brick, tile, concrete,
etc.
n Turn mode selector on hammer drill to hammer mode.
n Apply light pressure and medium speed for best results
in brick.
n Apply additional pressure and high speed for hard materi-
als such as concrete.
n When drilling holes in tile, practice on a scrap piece to
determine the best speed and pressure.
Fig. 16
HAMMER OPERATION
DRILLING OPERATION
ADJUSTING
RING