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8
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
exceptions are iron and brass which should be drilled dry.
CAUTION:
Pressing excessively on the tool will not speed up the
drilling. In fact, this excessive pressure will only serve
to damage the tip of your bit, decrease the tool
performance and shorten the service life of the tool.
There is a tremendous force exerted on the tool/bit at
the time of hole break through. Hold the tool firmly and
exert care when the bit begins to break through the
workpiece.
A stuck bit can be removed simply by setting the
reversing switch to reverse rotation in order to back
out. However, the tool may back out abruptly if you do
not hold it firmly.
Always secure small workpieces in a vise or similar
hold-down device.
If the tool is operated continuously until the battery
cartridge has discharged, allow the tool to rest for
15 minutes before proceeding with a fresh battery.
MAINTENANCE
CAUTION:
Always be sure that the tool is switched off and the
battery cartridge is removed before attempting to
perform inspection or maintenance.
Replacing carbon brushes
Replace when they wear down to the limit mark. Keep the
carbon brushes clean and free to slip in the holders. Both
carbon brushes should be replaced at the same time. Use
only identical carbon brushes. (Fig. 13)
Use a screwdriver to remove two screws then remove the
rear cover. (Fig. 14)
Raise the arm part of the spring and then place it in the
recessed part of the housing with a slotted bit screwdriver
of slender shaft or the like. (Fig. 15)
Use pliers to remove the carbonbrush caps of the carbon
brushes. Take out the worn carbon brushes, insert the
new ones and replace the carbonbrush caps in reverse.
(Fig. 16)
Make sure that the carbonbrush caps have fit into the
holes in brush holders securely. (Fig. 17)
Reinstall the rear cover and tighten two screws securely.
To maintain product SAFETY and RELIABILITY, repairs,
any other maintenance or adjustment should be
performed by Makita Authorized Service Centers, always
using Makita replacement parts.
ACCESSORIES
CAUTION:
These accessories or attachments are recommended
for use with your Makita tool specified in this manual.
The use of any other accessories or attachments might
present a risk of injury to persons. Only use accessory
or attachment for its stated purpose.
If you need any assistance for more details regarding
these accessories, ask your local Makita service center.
Drill bits
Screw bits
•Hook
Grip assembly
Various type of Makita genuine batteries and chargers
Rubber pad assembly
Wool bonnet
Foam polishing pad
For Model BDF441
Noise
ENG103-4
The typical A-weighted noise level determined according
to EN60745:
Sound pressure level (L
pA
): 70 dB (A) or less
Uncertainty (K): 3 dB (A)
The noise level under working may exceed 80 dB (A).
Wear ear protection.
Vibration
ENG202-3
The vibration total value (tri-axial vector sum) determined
according to EN60745:
Work mode: drilling into metal
Vibration emission (a
h,D
): 2.5 m/s
2
or less
Uncertainty (K): 1.5 m/s
2
For Model BDF451
Noise
ENG104-2
The typical A-weighted noise level determined according
to EN60745:
Sound pressure level (L
pA
): 72 dB (A)
Uncertainty (K): 3 dB (A)
The noise level under working may exceed 80 dB (A).
Wear ear protection.
Vibration
ENG202-3
The vibration total value (tri-axial vector sum) determined
according to EN60745:
Work mode: drilling into metal
Vibration emission (a
h,D
): 2.5 m/s
2
or less
Uncertainty (K): 1.5 m/s
2
ENG901-1
The declared vibration emission value has been
measured in accordance with the standard test method
and may be used for comparing one tool with another.
The declared vibration emission value may also be
used in a preliminary assessment of exposure.
WARNING:
The vibration emission during actual use of the power
tool can differ from the declared emission value
depending on the ways in which the tool is used.
Be sure to identify safety measures to protect the
operator that are based on an estimation of exposure in
the actual conditions of use (taking account of all parts
of the operating cycle such as the times when the tool
is switched off and when it is running idle in addition to
the trigger time).
EC Declaration of Conformity
ENH101-12
We Makita Corporation as the responsible
manufacturer declare that the following Makita
machine(s):
Designation of Machine: Cordless Driver Drill
Model No./ Type: BDF441, BDF451
are of series production and
8


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