Hitachi DH 40FR, Technical Data And Service Manual

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4-1. Selling Point Descriptions

4-1-1. High drilling speed with low noise level

The drilling speed is maximum 40 % faster than that of similar products thanks to efficient striking energy

transmission.  Even so, the Model DH 40FR produces lower noise levels than those of similar products.

Maker 

•

 Model

Ratio of drilling speed

     %

Full-load vibration level

 dB (VL)

    m/s

2

HITACHI

DH 40FR

100

120

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 40FA/FB and the working tool smoothly penetrates into the workpiece with a light

pressing force.  The Model DH 40FR 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/

DH 40SR).  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 40FR 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.

Full-load noise level

  dB (A)

No-load noise level

  dB (A)

10.1

91

79

HITACHI

DH 40FA/FB

72

120

10.1

95

92

80

117

7.3

94

91

* Ratio of drilling speed:  A 25-mm dia. drill bit is used.
  Full-load vibration and noise levels: A 20-mm dia. drill bit is used.

B

76

121

10.8

92

86

HITACHI

DH 38YE

4-1-4. Constant speed control

The Model DH 40FR is equipped with a built-in electronic control

circuit that can adjust the number of hammering steplessly between

1320 and 2650 min

-1

 with the dial.  Even though the load varies, the

Model DH 40FR provides better operability and stable and efficient

drilling performance because the constant speed control minimizes

changes in number of rotation and 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.

4-1-6. Needle-pin type slip clutch

The Model DH 40FR is equipped with a needle-pin type slip clutch for higher slip torque accuracy and enhanced

safety (same as the Model DH 40FA/DH 40FB).

Speed-adjust dial