Hitachi D 13VB3 Technical Data And Service Manual page 13

WARNING: The larger the drill bit diameter, the larger the reactive force on your arm. Be careful not to
lose control of the drill because of this reactive force. To maintain firm control, establish
a good foothold, use side handle, hold the drill tightly with both hands, and ensure that
the drill is vertical to the material being drilled.
(5) Slip clutch mechanism (Only the Model D 13VB3)
The Model D 13VB3 is equipped with the slip clutch mechanism to avoid direct and strong reactive force due
to a sudden and heavy load by slipping the transmission portion between the motor and the drill bit.
CAUTION:
Turn off the switch immediately if the rotation of the drill bit is stopped by the slip clutch. Be careful
not to actuate the slip clutch frequently.
The spindle shaft torque and the reactive force applied to the side handle when the slip clutch
actuates are shown in the table below. In the case of the low gear, the reactive force applied to the
side handle may be 150.4 N {15.3 kgf} at the maximum. Instruct the customers to use the side handle
without fail and securely hold the Model D 13VB3 with both hands standing on a sturdy scaffold, not to
be affected by the reactive force.
High gear
Low gear
Spindle shaft torque
.
N m
Minimum 6.1
Maximum
11.0
Minimum
16.8
Maximum
30.4
Reactive force applied to
the side handle
.
kgf m
30.2
0.6
54.5
1.1
83.4
1.7
150.4
3.1
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N kgf
3.1
5.6
8.5
15.3