Selection Of Blades - Hitachi CR 18DV Handling Instructions Manual

After the saw blade has been successfully removed,
be absolutely sure to clean it up with air, etc., carry
out proper lubrication, and then check and see if the
saw blade mount can function smoothly.
3. Moving the base
Loosen the set screw and move the base forward, as
shown in Fig. 12. Tighten the set screw slightly, ensure
the base does not move back and forth, and firmly
tighten the set screw. Ensure that the base does not
contact the blade.
4. Confirm that the battery is mounted correctly.
HOW TO USE
CAUTION
Do not carry tools with your finger on the switch. A
sudden startup can result in an unexpected injury.
Be careful not to let sawdust, earth, moisture, etc.,
enter the inside of the machine through the plunger
section during operation. If sawdust and the like
accumulate in the plunger section, always clean it
before use. (refer to Fig. 4)
Do not remove the front cover.
Be sure to hold the body from the top of the front
cover. (refer to Fig. 4)
During use, press the base against the material while
cutting.
Vibration can damage the saw blade if the base is not
pressed firmly against the workpiece.
Furthermore, a tip of the saw blade can sometimes
contact the inner wall of the pipe, damaging the saw
blade.
Select a saw blade of the most appropriate length.
Ideally, the length protruding from the base of the
saw blade after subtracting the stroke quantity should
be larger than the material (see Fig. 14 and
Fig. 16).
If you cut a large pipe, large block of wood, etc., that
exceeds the cutting capacity of a blade; there is a risk
that the blade may contact with the inner wall of the
pipe, wood, etc., resulting in damage. (Fig. 15, Fig.
17)
1. Switch operation
(1) Lock-off button
The tool is equipped with a lock-off button. To acivate
the trigger lock, move the button to the right positon.
Move the button to the left to operate the tool. (Fig.
13)
Always lock the switch when carrying or storing the
tool eliminate unintentional starting.
(2) Trigger switch
This tool is equipped with a variable speed controlled
trigger switch. The tool can be turned "ON" or "OFF"
by squeezing or releasing the trigger. The blade
plunger stroke rate can be adjusted from the minimum
to maximum nameplate stroke rate by the pressure
you apply to the trigger. Apply more pressure to
increase the speed and release pressure to decrease
speed.
2. Cutting metallic materials
CAUTION
Press the base firmly against the workpiece.
Never apply any unreasonable force to the saw blade
when cutting. Doing so can easily break the blade.
The motor can be locked sometimes, depending on
the combination of the material to be cut and the
17
blade. Whenever the motor gets locked, switch it off
immediately.
(1) Fasten a workpiece firmly before operation. (Fig. 18)
(2) When cutting metallic materials, use proper machine
oil (turbine oil, etc.). When not using liquid machine
oil, apply grease over the workpiece.
CAUTION
The service life of the saw blade will be drastically
shortened if you don't use machine oil.
3. Cutting lumber
When cutting lumber, make sure that the workpiece
is fastened firmly before beginning. (Fig. 19)
CAUTION
Never apply any unreasonable force to the saw blade
when cutting. Also remember to press the base
against the lumber firmly.
4. Sawing curved lines
We recommend that you use the BI-METAL blade
mentioned in Table 5 (Page 18) for the saw blade
since it is tough and hardly breaks.
CAUTION
Delay the feed speed when cutting the material into
small circular arcs. An unreasonably fast feed may
break the blade.
5. Plunge cutting
With this tool, you can perform plunge cutting on
plywood panels and thin board materials. You can
carry out pocket cutting quite easily with the saw
blade installed in reverse as illustrated in Fig. 21, Fig.
23, and Fig. 25. Use the saw blade that is as short and
thick as possible. We recommend for this purpose
that you use BI-METAL Blade No. 132 mentioned in
Page 18, Table 5. Be sure to use caution during the
cutting operation and observe the following
procedures.
(1) Press the lower part (or the upper part) of the base
against the material. Pull the switch trigger while
keeping the tip of the saw blade apart from the
material. (Fig. 20, Fig. 21)
(2) Raise the handle slowly and cut in with the saw blade
little by little. (Fig. 22, Fig. 23)
(3) Hold the body firmly until the saw blade completely
cuts into the material. (Fig. 24, Fig. 25)
CAUTION
Avoid plunge cutting for metallic materials. This can
easily damage the blade.
Never pull the switch trigger while the tip of the saw
blade tip is pressed against the material. If you do so,
the blade can easily be damaged when it collides
with the material.
Make absolutely sure that you cut slowly while holding
the body firmly. If you apply any unreasonable force
to the saw blade during the cutting operation, the
blade can easily be damaged.
NOTE
The use of the battery EB1830H in a cold condition
(below 0 degree Centigrade) can sometimes result in
the weakened cutting torque and reduced amount of
work. This, however, is a temporary phenomenon,
and returns to normal when the battery warms up.

SELECTION OF BLADES

To ensure maximum operating efficiency and results, it
is very important to select the appropriate blade best
suited to the type and thickness of the material to be cut.