Drilling into Concrete
Drilling in Concrete is a regular activity in a construction project. In home, sometimes we do the drilling in concrete too. Especially when you want to put a special hanger on a concrete structure, such as column or concrete wall. This drilling into concrete activity, if we do not do it carefully, it can cause a victim. So, for this work, we have to take care for the safety.
Drilling into Concrete Tools
If you want to drill into concrete, you may need these following tools :
Wood bit (optional).
Carbide driver bit.
Drilling into Concrete Procedure
Based on sfgate[dot]com, here is the drilling procedure :
Determine the exact location of the item you’re installing and snap chalk lines on the concrete floor. In the case of a wall, you would snap a chalk line to represent both sides of the bottom floor plate.
Predrill the item you’re attaching, if necessary. Drilling through wood and concrete requires two separate bits, so if you were building a wall, you would determine your stud layout and then drill holes through the wood plate with a standard drill and a bit about 1/16 inch larger than the screw diameter.
Position the item you’re installing on the concrete floor.
Fit a hammer drill with a carbide bit, sized for the size screw you’re using. Bit specifications appear on the concrete screw package.
Drill through the predrilled holes in the wood and into the concrete to a depth ¼ inch deeper than the screw length. For a standard 1 ½-inch bottom wall plate, if you were using ¼-inch-by-2 ¾-inch concrete screws, you would drill to a depth of 3 inches from the top of the wood. That gives you ¼-inch of space at the bottom of the drilled concrete hole, which is necessary to keep the screw from hitting the bottom.
Reposition a hole if you hit rebar while drilling in the concrete. Rebar, or steel reinforcing bars, are typically 3/8 inch to ½ inch in diameter and spaced on a 2-foot grid pattern. The odds are good that you won’t hit rebar, but if you do, the drill will come to a stop, or you might see metal shavings. Reposition the hole about an inch and redrill.
Fit a standard drill with a driver bit and adjust the speed to “Low.” Insert the concrete screws through the wood or the anchor plate of the item you’re installing. Hold the drill vertically and insert the screw only until the head is snug against the wood or anchor plate. Don’t countersink the screws.
Drilling into Concrete Tips
Familyhandyman[dot]com explained that there are tips you can use when drilling into concrete, here they are :
Clear the debris
The flutes on a drill bit are designed to pull up the debris from the hole as you drill, but the best way to clear the hole is to occasionally pull the bit out of the hole as you’re drilling. Less debris in the hole reduces friction, which means smoother drilling, less chance of binding and longer-lasting drill bits.
Most hammer drills and rotary hammers are sold with a side handle and depth stop. Do yourself a favor and use them. There’s no reason to burn up both time and bits by drilling deeper holes than you need to. And you don’t always want to drill all the way through a concrete block to its hollow core—some plastic anchors need a back to stop them or they will get pushed right through the hole.
Don’t push too hard
There’s a “sweet spot” where the right rpm combined with the right pressure drills fastest. But you won’t find that sweet spot by pushing down as hard as you can. In fact, too much pressure will slow the drilling process and put a whole lot of unnecessary wear and tear on the motor gears. Plus, you’ll break bits.
Drill a smaller hole first
If you need to drill a couple holes that are larger than the recommended capacity of your drill, start with a smaller hole first. This will significantly reduce the load on the drill. Also, smaller bits don’t skate around as much as larger bits do, which is helpful when you need a hole in a precise spot.
For your visualization, please check this following video of drilling into concrete activity :