Selling Point Descriptions - Hitachi DH 50MB Technical Data And Service Manual

4-1. Selling Point Descriptions

4-1-1. Dial type, constant speed electronic control with stepless variable-speed
The Model DH 50MB contains and electronic control circuit which allows the number of revolutions and the
number of strikes to be stepless adjustable from levels 1 to 5 on the dial. The number of revolutions and the
number of strikes are within the range of values in the graph shown below, due to variations of products.
The constant speed control minimizes the change in the number of revolutions or number of strikes at the position
set on the dial even if the load fluctuates, thus providing ease of use and stable drilling efficiency.
3000
2500
2000
1500
1000
1 2
Speed-adjust dial
Fig. 2
Blow
Rotation Speed
3
Speed-adjust dial
Fig. 3
--- 3 ---
4 5
350
300
250
200
150
100