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Hitachi CR 13 VA Manual

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9. Adjusting the swing cutting operation
Two cutting systems can be selected with this unit.
The first is straight cutting, in which the saw blade
is moved linearly, and the second is the swing
cutting, in which the saw blade is swung like a
pendulum. (Fig. 13, Fig. 14)
(1) Straight cutting
You can perform straight cutting by setting the
change lever widthwise. Straight cutting should
normally be performed when cutting hard materials
such as metal, etc. (Fig. 13)
(2) Swing cutting
You can perform swing cutting by setting the change
lever lengthways. Swing cutting should normally be
performed when cutting soft materials such as wood,
etc.
Swing cutting is efficient since the saw blade forcibly
bites into the material. (Fig. 14)
You can cut efficiently by swing cutting, mounting
the saw blade in whichever direction, upward or
downward.
CAUTION
⅜ Even for soft materials, you should perform straight
cutting if you wish to make curved or clean cuts.
⅜ Dust and dirt accumulated on the change lever
section can degrade the function of the change
lever. Periodically clean the change lever section.
HOW TO USE
CAUTION
⅜ Avoid carrying it plugged to the outlet with your
finger on the switch. A sudden startup can result
in an unexpected injury.
⅜ 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.
⅜ Do not remove the front cover (refer to Fig. 1).
Be sure to hold the body from the top of the front
cover.
⅜ 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.
⅜ 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. 15 and
Fig. 17).
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. 16, Fig. 18)
⅜ To maximize cutting efficiency for the materials you
are using and working conditions, adjust the speed
of the saw blade and the switching to swing cutting.
1. Cutting metallic materials
CAUTION
⅜ Press the base firmly against the workpiece.
⅜ Never apply any unreasonable force to the saw
blade when cutting. Doing so can easily break the
blade.
(1) Fasten a workpiece firmly before operation. (Fig. 19)
(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) Use the dial to adjust the speed of the saw blade
to suit your working conditions and materials.
(4) You can cut smoothly if you set the change lever
position to straight cutting (Fig. 13).
2. Cutting lumber
(1) When cutting lumber, make sure that the workpiece
is fastened firmly before beginning. (Fig. 20)
(2) You can cut efficiently if the speed of the saw blade
is set to dial scale “5”.
(3) You can cut efficiently if the change lever position
is set to swing cutting (Fig. 14). Alternatively, you
can cut cleanly if the change lever position is set
to straight cutting (Fig. 13).
CAUTION
⅜ Never apply any unreasonable force to the saw
blade when cutting. Also remember to press the
base against the lumber firmly.
3. Sawing curved lines
We recommend that you use the BI-METAL blade
mentioned in Table 2 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.
4. 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. 22,
Fig. 24, and Fig. 26. 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 Table 2. 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. 21, Fig. 22)
(2) Raise the handle slowly and cut in with the saw
blade little by little. (Fig. 23, Fig. 24)
(3) Hold the body firmly until the saw blade completely
cuts into the material. (Fig. 25, Fig. 26)
CAUTION
⅜ Avoid plunge cutting for metallic materials. This can
easily damage the blade.
⅜ 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.
⅜ 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.
… 9 …


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