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Hitachi CJ 120 VA Manual

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6. Adjusting the blade operating speed
This Jig Saw is equipped with the electric control
circuit which enables stepless speed control. To adjust
the speed, turn the dial shown in Fig. 4. When the dial
is set to “1”, the jig saw operates at the minimum
speed (850min
–1
). When the dial set to “5”, the jig saw
operates at the maximum speed (3000min
–1
). Adjust
the speed according to the material to be cut and
working efficiency.
CAUTION:
At low speed (dial setting: 1 or 2) do not cut a wood
with a thickness of more than 10 mm or metal with a
thickness of more than 1 mm.
7. Adjusting the orbital operation
(1) This Jig Saw employs orbital operation which moves
the blade back and forth, as well as up and down. Set
the change knob shown in Fig. 5 to “0” to eliminate
the orbital operation (the blade moves only up and
down). The orbital operation can be selected in 4 steps
from “0” to “III”.
(2)
For the hard material, such as a steel plate, etc.,
decrease the orbital operation. For the soft material,
such as lumber, plastic, etc., increase the orbital
operation to increase work efficiency. To cut the
material accurately, decrease the orbital operation.
8. Cutting stainless steel plates
This Jig Saw can cut stainless steel plates by using
No. 97 blade. Carefully read “Concerning cutting of
stainless steel plates” for proper operation.
9. Splinter guard
Using the splinter guard when cutting wood materials
will reduce splintering of cut surfaces.
Insert the splinter guard in the space on the base, and
push it completely. (See Fig. 6)
10. Chip cover
Chip cover prevents chips from flying off and
improves the efficiency of dust collector.
Insert the chip cover between the base and lever, and
push with a slight pressure until it catches in place.
(Fig. 7)
When removing chip cover, hold both sides of knob
and slightly open until it can be removed from the Jig
Saw. (Fig. 8)
NOTE:
There is a possibility that chip cover is frosted when
cutting the metal.
11. Sub base
Using the sub base (made from steel) will reduce
abrasion of aluminium base especially in cutting
metals.
Using the sub base (made from resin) will reduce
scratching of cut surface. Attach the sub base to the
bottom surface of base by attached 4 screws.
CUTTING
CAUTION:
⅜ In order to prevent blade dislodging, damage or
excessive wear on the Plunger, please make sure to
have surface of the base plate attached to the work
piece while sawing.
1. Rectilinear cutting
When cutting on a straight line, first draw a marking
gauge line and advance the saw along that line. Using
the guide (sold separately) will make it possible to
cut accurately on a straight line.
(1) Loosen the base bolt hexagonal bar wrench attached
on base. (Fig. 9)
(2) Move the base fully forward (Fig. 10), and tighten the
base bolt again.
(3) Attach the guide by passing it through the attachment
hole on the base and tighten the M5 bolt. (Fig. 11)
(4) Set the orbital position to “0”.
NOTE:
To ensure accurate cutting when using the Guide
(Fig.11), always set the orbital position to “0”.
2. Sawing curved lines
When sawing a small circular arc, reduce the feeding
speed of the machine. If the machine is fed too fast, it
could cause the blade to break.
3. Cutting a circle or a circular arc
The guide also will be helpful for circular cutting.
After attaching the guide by same way noted as above,
drive the nail or screw into the material through the
hole on the guide, then use it for an axis when cutting.
(Fig. 12)
NOTE:
Circular cutting must be done with the blade
approximately vertical to the bottom surface of the
base.
4. Cutting metallic materials
(1) Adjust the speed Dial between scales “3” and “4”.
(2) Set the orbital position to “0” or “I”.
(3) Always use an appropriate cutting fluid (spindle oil,
soapy water, etc.). When a liquid cutting fluid is not
available, apply grease to the back surface of the
material to be cut.
5. Pocket cutting
(1) In lumber
Aligning the blade direction with the grain of the
wood, cut step by step until a window hole is cut in
the center of the lumber. (Fig. 13)
(2) In other materials
When cutting a window hole in materials other than
lumber, initially bore a hole with a drill or similar tool
from which to start cutting.
6. Angular cutting
The base can be swiveled to both sides by up to 45°
for angular cutting. (Fig. 14)
(1) Loosen the base bolt by hexagonal bar wrench
attached on base and move the base fully forward.
(Fig. 9, 10)
(2) Align the scale (from 0 degrees to 45 degrees by 15-
degree increments) of the semi-circular part of the
base with the [
] mark on the gear cover. (Fig. 15)
(3) Tighten the M5 bolt again. (Fig. 9)
(4) Set the orbital position to “0”.
NOTE:
Angular cutting can not be done when adopting chip
cover or dust collector.
CONCERNING CUTTING OF STAINLESS STEEL
PLATES
CAUTION:
In order to prevent blade dislodging, damage or excessive
wear on the Plunger, please make sure to have surface
of the base plate attached to the work piece while sawing.
When cutting stainless steel plates, adjust the unit as
described below:
01Eng_CJ120V_WE 08/10/15, 10:439
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