Drilling Operation - Makita DA4030 Instruction Manual

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.
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
CAUTION:
• This is a powerful tool. High torque is devel-
oped and it is important that the tool should be
securely held and properly braced.
Grasp the switch handle with one hand and the spade
grip with the other hand. When drilling a large hole
with a self-feed bit, etc., the side grip (auxiliary handle)
should be used as a brace to maintain safe control of
the tool.
When drilling action is forward (clockwise), the tool
should be braced to prevent a counterclockwise reac-
tion if the bit should bind. When reversing, brace the
tool to prevent a clockwise reaction. If the bit must be
removed from a partially drilled hole, be sure the tool is
properly braced before reversing.
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► 1. Reaction 2. Forward 3. Spade grip 4. Handle
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► 1. Reaction 2. Reverse

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.
6 ENGLISH
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