Technical Information技術的な案内
Core bit jammed in the hole
The bit binds in the hole and will not turn or withdraw.
Cause
Solution
Not enough water to remove the slurry.
Remove the bit and drive the core out with a spike through the hub. Increase water flow.
The core barrel is dented from hammering to remove stuck cores.
Repair the barrel and increase water flow.
A steel bar moved during drilling and jammed the bit.
Disconnect the bit from the machine. Use a spanner to turn the bit in both directions until it is released.
Source: Shibuya Overview Catalogue, Technical Information.