Harder materials and larger bits require working at a lower speed.
Ensure power tools are used with the correct shield, guard, or attachments, recommended by the manufacturer.
Get an extra battery pack when buying a drill so you won't have to wait for a battery to charge. Now the drill bit will stay where you want it to.
Most models have plenty of torque (turning force) for driving screws. A torque limiter lets the drive slip once the set torque is reached. It's useful for flush-driving countersunk screws. The final click position locks the drive for drilling.
Replace worn or bent wrenches before the next use.
Do not use machine a without guards supplied.
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.
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