Core Drill Safety

Core drills cut cylindrical holes through concrete, masonry, and stone using diamond-tipped barrels.
The drill rig must be securely fixed to the surface using anchor bolts or a vacuum pad system.
Water supply is essential for cooling the diamond barrel and suppressing concrete dust during drilling.
Slurry water from the drilling operation is highly alkaline and must be contained and disposed of properly.
Drilling through reinforcement can snag the barrel, causing violent rotation of the rig and operator injury.
Hidden services including electrical cables and water pipes behind the wall or in the slab must be located.
The core plug at the far side of the hole can fall uncontrolled when the barrel breaks through.
Noise levels during core drilling typically exceed 85 dB, requiring mandatory hearing protection.
Wet drilling on walls creates slippery floor surfaces from water and slurry runoff.
Operators must be trained in core drill setup, operation, and emergency shutdown procedures.

Rig rotation	A snagged barrel causes the rig to spin violently, throwing or injuring the operator in an instant.
Service strikes	Drilling through hidden electrical cables or gas pipes causes electrocution, fire, and explosion.
Silica dust	Dry core drilling generates extremely high concentrations of respirable crystalline silica.

Do

Don't

Fix the drill rig securely to the surface using anchor bolts or a rated vacuum pad
Locate hidden services using a cover meter and CAT scanner before drilling
Use a continuous water supply to cool the barrel and suppress silica dust
Contain and collect slurry water for proper disposal — do not let it enter drains
Wear hearing protection throughout the core drilling operation
Support the far side of the hole to catch the core plug when breakthrough occurs
Wear eye protection and waterproof clothing during wet drilling operations
Ensure the operator is trained in core drill setup and emergency shutdown
Clean up water and slurry from the floor to prevent slip hazards for other workers
Inspect the diamond barrel and rig components before each drilling session

DON'T operate the core drill without securing the rig firmly to the surface
DON'T drill into walls, floors, or slabs without locating hidden services first
DON'T dry drill concrete — always use water supply for cooling and dust control
DON'T allow slurry water to run into surface water drains or watercourses
DON'T force the drill into reinforcement — withdraw and reassess if the barrel snags
DON'T stand in the rotation plane of the rig in case of barrel snag and spin
DON'T leave the far side of the hole unprotected where falling core plugs could injure
DON'T operate without hearing protection — noise levels are consistently high
DON'T use a worn diamond barrel — it overheats and reduces drilling control
DON'T leave wet slurry on floor surfaces where others could slip and fall

See also: Cutting Concrete and Block | Disc Cutter and Cut-Off Saw Safety

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