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.
Ensure ground-fault circuit interrupters are provided on all temporary construction electrical circuits.
Ensure power tools are used with the correct shield, guard, or attachments, recommended by the manufacturer.
Use an angled block to help you drill an angled hole.
Power drills come in two types, DIY quality or professional quality.
When you feel your power drill is becoming hot, run it flat out under no load - it will cool down faster than it would simply being left to cool.
A spade bit tends to tear the wood as it drills through the other side.
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