You should still be wearing your goggles throughout this process in order to protect against any concrete dust and shards that might fly in your face and scratch your eyes. Once you have drilled your hole to the necessary depth, blow all of the concrete dust out of the hole with a can of compressed air then vacuum up whatever has fallen to the ground. Considering you can bore a two-inch hole in under a minute using a hammer drill, pausing every 15 to 20 seconds should suffice. Periodically pull the drill out to brush away concrete dust. When you’re done, resume drilling the concrete at a slow speed until you’re sure you’ve passed the rough patch. Put the tip of the masonry nail at the problem spot and give it a few taps-not hard whacks-with the hammer to break up the obstruction. Whenever you reach any too-tough-to-crack spots that impede progress, set the drill down and grab the masonry nail and hammer. This can damage the bits or drill, or cause you to lose control of the drill and mess up your hole, damage the concrete surface, or worse.
If you hit obstructions, never force the drill farther into the concrete. If you’re feeling confident, turn the speed to full, keeping a firm grip on the tool with both hands, and drill into the concrete until the hole is complete.īeware: Concrete can have air pockets and pebbles or stones that can make resistance unpredictable, with the result that it can be disturbingly easy to lose control of the tool for a moment. When you start with a guide hole at least 1/8 inch deep, your drill will be easier to control, but all the same continue to operate the drill with a steady, light-but-firm touch so you’re never forcing it in. The guide hole needs to be just 1/8 to ¼ inch deep. If your drill has only one speed, then work in short, controlled bursts of a few seconds each until you’ve established a hole. Many hammer drills offer only two speeds, so turn your drill on at the slower speed for best control when making the guide hole. Be prepared for some recoil from the drill’s hammer action. When you lean in to bore the hole, the drill bit should be perfectly perpendicular to the concrete.
It’s critical to control the drill so it doesn’t run away once you begin work. Hold your drill securely with both hands: Grip it in one hand like a handgun, and, if there’s no auxiliary handle for your spare hand, use that hand to brace the back of the drill. Tools & Materialsĭon your goggles, then insert the appropriate tungsten carbide masonry drill bit for your desired hole size into the hammer drill. Next, get into position to drill by planting your feet firmly on the ground, shoulder-width apart. Note that although the Dewalt tool (about $100 on Amazon) costs more than twice as much, it offers more power than either the SKIL (about $50 on Amazon) or Black & Decker models (also about $50 on Amazon). Among others, DeWalt, SKIL, Black & Decker each offer a popular model suitable for most DIY applications. When renting or buying a hammer drill, look for one with good power, ideally more than one speed setting, a stop function, and an auxiliary handle for your spare hand for enhanced comfort, control, and safety. A quality hammer drill (also known as a rotary hammer) can bore a two-inch-deep, ¼-inch-wide hole in less than a minute, which is much faster than a rotary drill and thus justifies its roughly $40 afternoon rental cost. Specially designed for drilling into masonry or rock using a rapid hammer action, these drills and their carbide-tipped masonry bits are widely available at tool rental shops. When you’re working with older concrete-or if you’re planning to drill multiple holes about two to four inches deep and up to ¾ inch wide-it’s best to upgrade to an electric hammer drill. You can, in fact, drill a hole in a concrete interior feature wall armed with nothing more than your trusty rotary drill and a masonry bit-so long as you take care to not burn out the motor of the drill or demolish the bits. Older concrete, however, is often much more dense than some of the cosmetic concrete used in modern finishes, so boring through a 50-year-old concrete foundation with your old-school rotary drill just won’t cut it.
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