Applications; Prior To Operation - Hitachi Koki DC 120V Mode D'emploi

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(3) Dust Extraction Range
Dust Sucker-Large (Fig. 5-1)
Dust Sucker-Small (Fig. 5-2)
Dust Swivel (Fig. 5-3)
Extention Rod for Dust Swivel (Length 230mm)
(Fig. 5-4)
CAUTION:
When using the dust swivel, connect the vacuum
cleaner hose before turning on the main unit
switch.
Used to such chips by connecting a vacuum cleaner.
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3
Optional accessories are subject to change without notice.

APPLICATIONS

Drilling various blocks and bricks products
Boring holes in metals, wood and plastics.

PRIOR TO OPERATION

1. Power source
Ensure that the power source to be utilized conforms
to the power requirements specified on the product
nameplate.
2. Power switch
Ensure that the power switch is in the OFF position. If
the plug is connected to a receptacle while the power
switch is in the ON position, the power tool will start
operating immediately, which could cause a serious
accident.
3. Extension cord
When the work area is removed from the power
source, use an extension cord of sufficient thickness
and rated capacity. The extension cord should be
kept as short as practicable.
CAUTION:
Damaged cord must be replaced or repaired.
4. Mounting the side handle
Mount the side handle in the main body, as shown in
Fig. 1.
Rotate the handle in clockwise direction to tighten
the side handle and rotate it in counterclockwise
direction to loosen it.
When mounting the side handle, loosen the handle
and mount the side handle to the gear cover. Then
press it to the proper position in the side handle
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4
Fig. 5
mounting section of the gear cover and tighten it.
Before operation, securely tighten the side handle.
(The side handle can be secured in any position over
360°.)
5. Clamping
Insert the diamond core bit or drill bit as far as it will
go into the open chuck. Clamp tightly in normal
manner by inserting the toothed end in the chuck
wrench into the three key holes.
PRACTICAL HANDLING PROCEDURES
1. Switch operation
Switching-on: Push the trigger.
Switching-off: Release the trigger.
CAUTION
Securely hold the handle of the main body and the
side handle when switching on as there is danger
that your hands may be turned by force of reaction.
2. Adjusting the operating speed
The machine is equipped with an electric control
circuit which enables non-step speed control. To
adjust the speed, turn the dial shown in Fig. 2. When
the dial is set to "1", the diamond core drill operates
at minimum speed (600/min). When the dial is set to
"5", the diamond core drill operates at maximum
speed (1400/min.). Adjust the speed according to the
material to be drilled and working efficiency.
CAUTION:
When continuously operating the diamond core
drill at low speed for a long time, the motor may
be overloaded and burn as a result.
When using a diamond core bit, use the low speed
operation only for positioning.
3. Diamond Core drilling
(1) Place the diamond core bit in the drilling location.
(2) When drilling, always hold the tool squarely against
the material.
(3) Do not force the core bit, but allow the core bit to do
the work. This will prolong the life of the core bit and
reduce breakage.
(4) Ensure that masonry dust/swarf produced during
drilling is regularly removed. Allowing dust/swarf to
accumulate will result in overheating and excessive
clutch/torque limiter wear and loss of segments from
the core bit.
(5) When entering or leaving a hole, ensure that the core
bit is rotating.
(6) If the core bit starts to vibrate and when the core bit
begins to break through the material, reduce pressure
immediately.
(7) After use, store the core bit carefully in its box and
remember that it is a diamond core bit.
cDrilling method by using Pilot Spigotv
For easy positioning, carry out the following steps
when using a diamond core bit.
(1) Make a pilot hole at the center position of the material
to be drilled with a 13 mm stone drill bit.
(2) Attach a pilot spigot to a diamond core bit.
(3) Align the pilot spigot to the pilot hole and begin the
drilling operation to make a guide groove.
(4) When making the guide groove, temporarily stop the
drilling operation and remove the pilot spigot.
(5) Align the diamond core bit with the guide groove and
start the drilling operation again.