9
2. Drilling speed comparisons
Drilling speed depends on the operating conditions. The test result is based on actual factory tests, and is
used as a reference only. The drilling speed comparisons for downward drilling. The drill bits used are the
Hitachi genuine SDS-plus shank bits.
0
100
200
300
400
500
600
700
2
4
6
8
10
12
14
16
18
Drill diameter (mm)
Hitachi
DH14DL/DH14DMR/
DH18DL/DH18DMR
Drilli
ng speed (mm/min.)
C
Pressing force: 10kgf
Test material: Concrete panel with
A compression strength of 240 kgf/cm
2