For power tools, excess heat is the enemy. It shortens motor and battery life and can even completely burn out an otherwise great tool in a few minutes.
Overheating is mainly caused by overloading a tool, especially during long work sessions. If the motor of your drill or circular saw gets more than warm to the touch, stop, take a break, and let things cool down for at least 15 minutes.
Got a cordless tool that just quit suddenly in the middle of a tough job? A growing number of cordless power tools shut down automatically when internal motor or battery temperatures get too high. Cordless tools may also have safeguards that prevent charging a battery when it’s too hot (or too cold).
Drills are typically the most susceptible to overheating, especially if you’re drilling metal. Cutting oil that contains sulphur makes a huge difference when drilling metal. It not only eases the load on the drill, but also makes drill bits last. Cobalt and titanium bits have more working life when drilling metal than cheaper high-speed steel bits, and since they stay sharp longer, they also put less load on your drill. Always drill metal with the slower gearbox setting on your drill, typically at about half of the tool’s maximum speed.
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If you’re drilling sheet metal, be cautious with regular twist bits. They will grab the metal and try to make it spin as the bit breaks through the bottom of the hole. Step bits are much safer—they’re unbeatable for boring smooth-edged holes in thin steel or aluminum, and there’s no danger of them overheating.
When you’re drilling big holes in wood, remember to draw out the bit after every inch or so. This clears out shavings that would otherwise create friction, heating the bit and making the drill motor work harder.
Overworked extension cords can also heat up. Choose one with enough amp rating for the tool you’re using and, if possible, don’t use a cord that’s way longer than you need. Unwind the entire cord before use to reduce electrical resistance.
This article was originally published in the August 2023 issue of Cottage Life.
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