DeWalt XR DCD470 Original Instructions Manual page 39

OPERATION
Instructions for Use

WARNING: Always observe the safety instructions and
applicable regulations.

WARNING: To reduce the risk of serious personal
injury, turn tool off and disconnect battery pack
before making any adjustments or removing/
installing attachments or accessories. An accidental
start-up can cause injury.
Proper Hand Position (Fig. H)

WARNING: To reduce the risk of serious personal injury,
ALWAYS use proper hand position as shown.

WARNING: To reduce the risk of serious personal
injury, ALWAYS hold securely in anticipation of a
sudden reaction.
Always hold tool firmly with both hands in the proper position
for operation as shown.
Drilling

WARNING: TO REDUCE THE RISK OF PERSONAL
INJURY, ALWAYS ensure workpiece is anchored or
clamped firmly. If drilling thin material, use a wood "back-
up" block to prevent damage to the material.
1. Use sharp drill bits only. For WOOD, use twist drill bits,
spade bits, power auger bits, self-feed bits, or hole saws. For
METAL, use steel twist drill bits or hole saws. For CONCRETE,
use dry core drill bits. Do not use water.
2. 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.
3. Hold tool firmly with both hands to control the twisting
action of the drill.
4. 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 ON AND OFF IN AN ATTEMPT TO
START A STALLED DRILL — THIS CAN DAMAGE THE DRILL.
5. To minimise stalling or breaking through the material,
reduce pressure on drill and ease the bit through the last
fractional part of the hole.
6. Keep the motor running when pulling the bit back out of a
drilled hole. This will help prevent jamming.
Drilling in Metal
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.
nOTE: Large 8 mm to 13 mm holes in steel can be made easier
if a pilot hole 4 mm to 5 mm is drilled first.
nOTE: When using a cutting lubricant, be sure not to get the
lubricant on the tool.
Drilling in Wood
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

WARNING: Never drill into masonry which is reinforced
such as rebar reinforced concrete.

WARNING: For applications which produce a
considerable amount of dust such as core drilling, always
use an auxiliary dust attachment with an M Class rated
dust extractor such as DWV902M.
Use dry core masonry bits. Keep even force on the drill but not
so much that you crack the brittle material. A smooth, even flow
of dust indicates the proper drilling rate.
Use sharp drill bits only. For masonry, such as brick, cement,
cinder block, etc., use dry diamond core bits
nOTE: Always use core bits designed for dry drilling.
Troubleshooting Drilling in Masonry
Problem
Core bit does not cut.
Material too hard for core bit.
Segments look glazed and polished • Drill in abrasive material to re-expose
Dust accumulating in core bit.
Accumuating dust slows down the
drilling speed.
Rotating speed may not
be appropriate.
Segments wear too fast.
MAINTENANCE
Your D WALT power tool has been designed to operate
e
over a long period of time with a minimum of maintenance.
Continuous satisfactory operation depends upon proper tool
care and regular cleaning.

WARNING: To reduce the risk of serious personal
injury, turn tool off and disconnect battery pack
before making any adjustments or removing/
installing attachments or accessories. An accidental
start-up can cause injury.
The charger and battery pack are not serviceable.
Lubrication
Your power tool requires no additional lubrication.
EnGLIsh
Solution
• Choose a more appropriate core bit
(with softer segments).
diamond segments.
• Disengage drill bit regularly to
evacuate cuttings. Check filter on dust
extraction, clean or replace
as required.
• Refer to the Maximum
Recommended Capacities
table for proper speed ratings.
• Choose a more appropriate core bit
(with harder segments).
• Reduce the pressure applied on the
core bit.
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