Hitachi DH 40SR, Руководство по обслуживанию и технические данные

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4-1. Selling Point Descriptions
4-1-1. High drilling speed with low vibration and noise level
The drilling speed is 10 % faster than that of similar products thanks to efficient striking energy transmission.
Even so, the Model DH 40SR produces lower vibration and noise levels than those of similar products.
Maker
•
Model
Ratio of drilling speed %
Full-load vibration level dB (VL)
m/s
2
HITACHI
DH 40SR
100
118
4-1-2. Self-drilling (Good feeling)
Thanks to the computer-simulated optimum striking characteristics, the quantity of body jumping is less than that
of the current Model DH 40SA and the working tool smoothly penetrates into the workpiece with a light pressing
force. The Model DH 40SR realizes quicker self-drilling with better impact feeling.
4-1-3. Internal double-insulation construction with sturdy aluminum frame
The aluminum die-cast outer frame is very sturdy (same as the Models H 45MR/H 45SR and DH 40MR).
In addition, a plastic internal S holder is adopted to realize double-insulation construction. Thus the housing has
greater rigidity and the double-insulated motor has greater durability. The Model DH 40SR is heavy-duty and the
service life of the carbon brush is greatly prolonged (1.5 times longer than the conventional one) minimizing
disconnection of the armature, deviation of the core and grease leakage.
4-1-4. Constant speed control
The Model DH 40SR is equipped with a built-in electronic control circuit that can keep constant speed in either no-
load operation or actually loaded operation. The Model DH 40SR provides better operability and stable, efficient
drilling performance even if the load varies because the constant speed control minimizes changes in speed and
number of hammering.
4-1-5. Soft-touch grip for easier handling
The double-layer molded handle consists of a nylon resin base covered with a soft plastic layer to ensure a soft
touch and firm, non-slip grip of the handles.
Full-load noise level dB (A)
No-load noise level dB (A)
8.0
95
79
HITACHI
DH 40SA
72
118
8.0
95
88
C
72
120
10.2
96
87
* Each product used a 25-mm dia. drill bit for the above measurement.