Craftsman 315.271270 - Manual (Page 15)

OPERATION
TO ADJUST DRILLING OR HAMMER MODE
See Figure 19.
To adjust drill to drilling or hammer operation, rotate mode
selector in the direction of arrows as shown in Figure 19.
For your convenience a hammer symbol and drill bit
symbol have been molded into the selector.
A 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
■ For maximum performance, use high speed steel bits
for wood drilling.
■ Turn mode selector ring on hammer drill to normal
drilling action.
■ 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.
■ 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.
■ Do not lock the trigger on for jobs where your
hammer drill may need to be stopped suddenly.
METAL DRILLING
■ For maximum performance, use high speed steel bits
for metal or steel drilling.
■ Turn mode selector on hammer drill to normal drilling
action.
■ Begin drilling at a very low speed to prevent the bit
from slipping off the starting point.
■ 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.
■ 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
■ For maximum performance use carbide-tipped
masonry impact bits when drilling holes in
brick, tile, concrete, etc.
■ Turn mode selector on hammer drill to
hammer mode. Rotate torque selector to drill position.
■ Apply light pressure and medium speed for best
results in brick.
■ Apply additional pressure and high speed for hard
materials such as concrete.
■ When drilling holes in tile, practice on a scrap
piece to determine the best speed and pressure.
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