Hitachi Koki DV 14DMR Handling Instructions Manual page 10

English
3. Rotation to Impact changeover (See Fig. 4)
The "Rotation (Rotation only)" and "Impact (Impact
+ Rotation)" can be switched by aligning the drill
mark " " or the hammer mark " " with the triangle
mark on the outer body.
To make holes in the metal, wood or plastic, switch
to "Rotation (Rotation only)".
To make holes in bricks or concrete blocks, switch to
"Impact (Impact + Rotation)".
CAUTION
If an operation which is normally performed at the
"Rotation" setting is performed at "Impact " setting,
the effect of making holes does not only increase but
it may also damage the bit or other parts.
4. Change rotation speed
Operate the shift knob to change the rotational speed.
Move the shift knob in the direction of the arrow (see
Figs. 6 and 7).
When the shift knob is set to "LOW", the drill rotates
at a low speed. When set to "HIGH", the drill rotates
at a high speed.
Work
Brick
Wood
Drilling
Steel
Aluminum
Machine screw
Driving
Wood screw
6. How to select tightening torque and rotational speed
Use
Machine screw
Driving
Wood screw
Brick
Drilling
Wood
Metal
CAUTION
The selection examples shown in Table 5 should be
considered as general standard. As different types of
tightening screws and different materials to be
tightened are used in actual works proper adjustments
are naturally necessary.
When using the impact driver drill with a machine
screw at HIGH (high speed), a screw may damage or
a bit may loose due to the tightning torque is too
9
Table 4
Use for drilling purpose.
Use the bit or socket matching the screw diameter.
Use after drilling a pilot hole.
Table 5
Rotating speed selection (Position of the shift knob)
Cap Position
LOW (Low speed)
For 4 mm or smaller
1 – 22
diameter screws.
For 8 mm or smaller nominal
1 –
diameter screws.
For 14 mm or smaller
diameters. (DV14DMR)
For 16 mm or smaller
diameters. (DV18DMR)
For 45 mm or smaller
diameters. (DV14DMR)
For 50 mm or smaller
diameters. (DV18DMR)
For drilling with a metal
working drill bit.
CAUTION
When changing the rotational speed with the shift
knob, confirm that the switch is off.
Changing the speed while the motor is rotating will
damage the gears.
When setting the shift knob to "HIGH" (high speed)
and the position of the cap is bitween "16" and "22",
it may happen that the clutch does not engaged and
that the motor is locked. In such a case, please set the
shift knob to "LOW" (low speed).
If the motor is locked, immediately turn the power
off. If the motor is locked for a while, the motor or
battery may be burnt.
5. The scope and suggestions for uses
The usable scope for various types of work based on
the mechanical structure of this unit is shown in
Table 4.
Suggestions
strong. Use the impact driver drill at LOW (low speed)
when using a machine screw.
NOTE
The use of the battery EB1426H, EB1430H, EB1826HL
and EB1830HL in a cold condition (below 0 degree
Centigrade) can sometimes result in the weakened
tightening torque and reduced amount of work. This,
however, is a temporary phenomenon, and returns
to normal when the battery warms up.
HIGH (High speed)
For 6 mm or smaller
diameter screws.
For 4.8 mm or smaller
nominal diameter screws.
For 10 mm or smaller
diameters. (DV14DMR)
For 12 mm or smaller
diameters. (DV18DMR)
For 20 mm or smaller
diameters. (DV14DMR)
For 22 mm or smaller
diameters. (DV18DMR)