Powered Hand Tools - Drills

• Follow manufacturers' instructions when selecting and using bits or attachments, especially with unfamiliar drills or work.
• Select bits or attachments that: 
  • match the size and capacity of the drill.
  • are appropriate for the material and the type of work.
• Ensure all bits or attachments:
  • are properly seated and tightened in the chuck.
  • turn true to avoid vibration or imbalance.
• Use the auxiliary (second) handle for large-scale work or continuous operation.

• Wear safety glasses or a face shield (with safety glasses or goggles).
• Keep drill air vents clear to maintain adequate ventilation.
• Keep drill bits sharp.
• Inspect for frays or damage before each use.
• Keep all cords clear of the cutting area during use. 
• If using a battery-powered drill: 
  • inspect the battery for any damage, cracks, or leaks before use. 
  • follow the manufacturer's instructions for charging and storing the battery. Avoid overcharging or exposing it to extreme temperatures. See the OSH Answers on Battery Charging - Lithium-ion Batteries for more information. 
• Disconnect the power supply before changing or adjusting bits or attachments.
• Tighten the chuck securely. Remove the chuck key before starting the drill.
• Secure workpiece being drilled to prevent movement.

• Slow the feed rate just before breaking through the surface to prevent damage.
• Drill a small "pilot hole" before drilling large holes to improve accuracy and to reduce stress on the bit.

• Clamp small stock securely to prevent twisting or spinning.
• Never drill with one hand while holding the material with the other.

• Do not use bent drill bits.
• Do not exceed the manufacturer's recommended maximum drilling capacities.
• Do not use a hole saw cutter without a pilot drill.
• Do not use high-speed steel (HSS) bits without cooling or using lubrication.
• Do not attempt to free a jammed bit by starting and stopping the drill. Unplug the drill and then remove the bit from the workpiece.
• Do not reach under or around the stock being drilled.
• Do not overreach. Always keep proper footing and balance.
• Do not raise or lower the drill by its power cord.
• Do not use the drill in wet or muddy locations. Use a nonpowered drill instead.
• Do not use excessive force to drill into hard material. Reduce drill speed if possible.
• Do no use 

Refer to Powered Hand Tools - Basic Safety for Electric Tools for general safety tips.