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6-2. Drilling Speed Comparisons
Drilling speed varies considerably depending on the work conditions. Use the factory test results shown in Fig. 4
as a reference, for comparison purposes only.
Fig. 4
0
100
200
300
400
500
DH 50MB
B
D
DH 50MB
B
D
DH 50MB
B
D
DH 50MB
B
D
DH 50MB
B
D
DH 50MB
B
D
DH 50MB
B
D
DH 50MB
B
D
HITACHI
B
D
HITACHI
B
D
HITACHI
B
D
HITACHI
B
D
HITACHI
B
D
HITACHI
B
D
HITACHI
B
D
HITACHI
B
D
φ
16
φ
19
φ
22
φ
25
φ
28
φ
32
φ
38
φ
40
480
380
340
430
320
290
275
250
290
225
370
225
240
190
190
160
130
120
110
110
75 *
60 *
90
90
Drill bit dia.
(mm)
Maker
Model
Drilling speed (mm/min.)
*: Note that the data marked with asterisks are test results using drill bits which are beyond the tool's rated capacity. Use the
above data as a reference, for comparison purposes only.
[Test conditions]
Orientation
: Downward drilling
Pressing force : 10 kgf
Test material
: Concrete panel with a compression strength of 240 kgf/cm
2
Drill bit size
: SDS-max shank drill bit