Ensure ground-fault circuit interrupters are provided on all temporary construction electrical circuits.
When you want to drill one or more holes to a certain depth, wrap tape around the drill bit so the bottom edge of the tape contacts the material at the desired depth
Make sure all cord-connected, electrically operated tools and equipment are effectively grounded or of the approved double insulated type.
If you want to drill thru a tile or other breakable material, mark the spot where you want to drill and cover with a couple of pieces of masking tape. The drill bit should not wander.
Keep the compressor tanks drained of moisture.
Always buy a drill with a two-speed gearbox. In high gear (typically 0-1000rpm), the tool spins fast enough for quick drilling, and in low gear (typically 0-400rpm) you get controllable, grunty, screwdriving. You change gear using a slide: make sure it operates smoothly and without excessive force.
Maintaining your tools increases their life.
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