Operation - DeWalt DW505 Instruction Manual

FIGURE 4
HAMMER
SETTING

Operation

DRILLING
1. Always unplug the drill when attaching or changing bits or
accessories.
2. Use sharp drill bits only. For WOOD, use the low speed setting and
twist drill bits, spade bits, power auger bits, or hole saws. For
METAL, use the low speed setting and steel twist drill bits or hole
saws. For MASONRY, such as brick, cement, cinder block, etc.,
use carbide-tipped bits rated for percussion drilling. Use low speed
for bits greater than 3/8".
3. Be sure the material to be drilled is anchored or clamped firmly. If
drilling thin material, use a wood "back-up" block to prevent
damage to the material.
4. Always apply pressure in a straight line with the bit. Use enough
pressure to keep drill biting, but do not push hard enough to stall
the motor or deflect the bit.
5. Hold tool firmly to control the twisting action of the drill.
6. IF DRILL STALLS, it is usually because it is being overloaded or
improperly used. RELEASE TRIGGER IMMEDIATELY, remove
drill bit from work, and determine cause of stalling. DO NOT
CLICK TRIGGER OFF AND ON IN AN ATTEMPT TO START A
STALLED DRILL — THIS CAN DAMAGE THE DRILL.
7. To minimize stalling or breaking through the material, reduce
pressure on drill and ease the bit through the last fractional part of
the hole.
8. Keep the motor running when pulling the bit back out of a drilled
DRILL
hole. This will help prevent jamming.
SETTING
9. With variable speed drills there is no need to center punch the
point to be drilled. Use a slow speed to start the hole and
accelerate by squeezing the trigger harder when the hole is deep
enough to drill without the bit skipping out.
DRILLING IN METAL
USE ONLY in the "low speed" gear range. Start drilling with slow speed
and increase to full power while applying firm pressure on the tool. A
smooth even flow of metal chips indicates the proper drilling rate. Use
a cutting lubricant when drilling metals. The exceptions are cast iron
and brass which should be drilled dry. The cutting lubricants that work
best are sulphurized cutting oil or lard oil; bacon-grease will also serve
the purpose.
NOTE: Large (5/16" to 1/2") holes in steel can be made easier if a
pilot hole (5/32" to 3/16") is drilled first.
DRILLING IN WOOD
USE ONLY in the "low speed" gear range. Start drilling with slow speed
and increase to full power while applying firm pressure on the tool.
Holes in wood can be made with the same twist drills used for metal.
These bits may overheat unless pulled out frequently to clear chips
from the flutes. Work that is apt to splinter should be backed up with a
block of wood.
DRILLING IN MASONRY
When drilling in masonry, use carbide tipped bits rated for percussion
drilling and be certain that the bit is sharp. For holes up to 3/8" diameter
use the "high speed"gear range. For holes larger than 3/8", use the
the "low speed" gear range. Ensure that the hammer mode is selected.
Use a constant and firm force on the tool to drill most effectively. A
smooth, even flow of dust indicates the proper drilling rate.
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