Torque Limiter; Operation - Makita 8406C Instruction Manual

Torque limiter

CAUTION:
Do not continue to operate the tool for more than
•
two seconds while the torque limiter is actuating.
Do not let the torque limiter actuate too frequently.
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This tool is equipped with torque limiters. They will
actuate when a certain torque level is reached. When this
happens, the chuck will stop turning.
ASSEMBLY
CAUTION:
Always be sure that the tool is switched off and
•
unplugged before carrying out any work on the tool.
Installing side grip (auxiliary handle)
Fig.7
Always use the side grip to ensure operating safety.
Install the side grip so that the teeth on the grip fit in
between the protrusions on the tool barrel.
Then tighten the grip by turning clockwise at the desired
position. It may be swung 360° so as to be secured at
any position.
Installing cover (Accessory)
Fig.8
CAUTION:
When using a wet type of diamond core bit, always
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install a cover (optional accessory) on the tool to
thoroughly protect the tool from water.
First, unplug the tool. Remove the grip base from the tool.
Install the cover on the tool so that the teeth on the cover
fit into the grooves on the tool. Then, install the grip base
on the tool and secure by tightening the side grip firmly.
Installing or removing diamond core bit or
drill bit
Fig.9
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 original
position.
Depth gauge
Fig.10
The depth gauge is convenient for drilling holes of
uniform depth. Insert the depth gauge into the hole in the
grip base and adjust the depth gauge to the desired
depth. Then tighten the clamp screw to secure the depth
gauge.

OPERATION

Diamond core drilling operation
CAUTION:
When performing diamond core drilling operations,
•
always set the change lever to the
use "rotation only" action. If performing diamond
core drilling operations using "rotation with
hammering" action, the diamond core bit may be
damaged.
The drilling efficiency and service life of the
•
diamond core bit varies greatly depending on the
kind or condition of the material to be drilled. In
general, hard material may dull the bit soon and
soft materials such as "green" concrete or concrete
blocks may shorten the service life of the bit.
If the drilling action of the diamond core bit begins
•
to diminish, dress the bit using an old discarded
coarse-grit bench grinder wheel or concrete block.
Tightly secure the bench grinder wheel or concrete
block and drill in it. Continued use of dull bits may
cause the diamond chips to break or fall off.
When using a wet type of diamond core bit, always
•
install a cover (optional accessory) on the tool to
thoroughly protect the tool from water. Refer to the
previously covered "Installing cover".
After using a wet type of diamond core bit, wash it
•
in water and store with the sponge and guide ring in
a dry location.
1. Drilling with wet type of diamond core bit
First, unplug the tool. Soak the sponge in water. Place
the tool with the bit end pointing upwards. Carefully fill
the bit about half full of water. Insert the sponge into the
bit gently with the side with the rivet facing upwards as far
as it will go.
Fig.11
CAUTION:
When filling the bit with water, be especially careful
•
not to let the tool get wet.
Remove water and dirt form the guide ring and from the
drilling location. Attach the adhesive sheet to the drilling
location and place the guide ring on it.
Fig.12
Place the bit in the guide ring and turn the tool on.
Fig.13
After drilling a pilot groove, turn the tool off and then
remove the guide ring and adhesive sheet.
Fig.14
Place the bit into the pilot groove and turn the tool on.
Pivot the tool gently in the hole to be drilled while tilting it
at an angle of 2° - 3°. Gradually decrease the angle of tilt
as the hole becomes deeper. Immediately before hole
breakthrough, the tool should be held straight in relation
to the hole. After completing the hole, turn the tool off.
Wait until the bit has come to a complete stop before
7
position to