Selling Point Descriptions - Hitachi WH 12DMR Technical Data And Service Manualice Manual

5-1. Selling Point Descriptions

Common selling points (Models WH 12DMR and WR 12DMR)
(1) High durability
Owing to the shift of demand from nails to screws and increased demand for long screws, impact drivers
having high heat resistance in continuous operation are much sought after. However, there are problems such
as heavy noise or vibration of the ball bearings and decrease in power if the impact drivers are used harshly in
dusty environments. In addition, higher strength and longer service life are required to continuously tighten
and loosen bolts in scaffolding and demolishing works. The Models WH 12DMR/WR 12DMR have high
durability, dust resistance and long service life in continuous operation as described below.
1 Enhanced heat resistance of the motor
Example: When tightening M12 bolts continuously (Cycle of operation: 5-second impacting and 10-second
stopping, 3.0 Ah battery used)
The heat resistance comparison between the Models WH 12DMR/WR 12DMR and P is shown below.
The cooling efficiency is improved thanks to the powerful full-fledged large radial fan and the computer-
analyzed air ducts. Thus the Models WH 12DMR/WR 12DMR are protected from burnout due to long-time
continuous use and decrease in speed due to temperature rise.
250
200
150
100
50
Selling points of the Model WH 12DMR
Top-class tightening speed and torque 130 N . m (1320 kgf . cm, 1150 in-lbs.)
Although the Model WH 12DMR is equipped with an anisotropic bonded magnet that is cheaper than that of
the Model WH 12DM2, the performance is almost equivalent to the Model WH 12DM2 thanks to the large
hammer and the optimized impact timing. Comparison of measured data with the Model WH 12DM2 and
competitors is shown below.
Tightening time comparison
1
Figure 1 shows the time required for tightening a wood screw (5.3 mm dia. x 120 mm length) into a lauan
workpiece. (5 % higher than the Model WH 12DM2 and 5 % lower than P).
P: Smoking
2 batteries
1 battery
0
P
Burnout
3 batteries
HITACHI WH 12DMR
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