Drilling Operation; Maintenance - Makita DA4000LR Instruction Manual

CAUTION:
• Be sure to tighten the two bolts firmly, or it may
present a risk of injury to persons.
Slide the drill chuck to the spindle so that the two faces are fitted
perfectly. Holding the drill chuck with the chuck key, tighten the bolt
(for installing the drill chuck) clockwise with the hex wrench firmly.
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2
3
4
► 1. Spindle 2. Two faces 3. Drill chuck 4. Chuck key
The tool may be converted to a conventional straight drive
drill by installing the drill chuck without the angle attachment.
2
► 1. Drill chuck 2. Spindle
Installing or removing drill bit
► 1. Chuck key
To install the bit, place it in the chuck as far as it will go.
Tighten the chuck by hand. Place the chuck key in each
of the three holes and tighten clockwise. Be sure to
tighten all three chuck holes evenly.
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1
To remove the bit, turn the chuck key counterclockwise
in just one hole, then loosen the chuck by hand.
After using the chuck key, be sure to return to the orig-
inal position.
OPERATION
Holding tool
When drilling a large hole with a hole saw, etc., the side
grip (auxiliary handle) should be used as a brace to
maintain safe control of the tool.

Drilling operation

Drilling in wood
When drilling in wood, the best results are obtained
with wood drills equipped with a guide screw. The guide
screw makes drilling easier by pulling the bit into the
workpiece.
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 excep-
tions 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 twisting force exerted
on the tool/bit at the time of hole breakthrough.
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.
• Avoid drilling in material that you suspect con-
tains hidden nails or other things that may cause
the bit to bind or break.

MAINTENANCE

CAUTION:
• Always be sure that the tool is switched off and
unplugged before attempting to perform inspec-
tion or maintenance.
• Never use gasoline, benzine, thinner, alcohol
or the like. Discoloration, deformation or cracks
may result.
6 ENGLISH