Drilling Speed Comparisons - Hitachi DH 40MR Technical And Service Manual

6-2. Drilling Speed Comparisons

Drilling speed varies considerably depending on the work conditions. Use the factory test results shown in Fig. 1
for comparison purposes only.
* 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 comparisons only.
[Test conditions]
Direction
Pushing force
Test material
: Downward drilling
: 98 N (10 kgf)
: Concrete panel with a compression strength of 2,919 N/cm
Fig. 1
--- 9 ---
2 2
(240 kgf/cm )