Putting a bit in a Dewalt drill is an easy task. There are several types of Dewalt drills on the market, but they all have chucks and jaws located on the front of them. The chucks will look different on battery-operated drills than on those with power cords attached. The chuck key also comes in several different sizes; heavy duty dewalt drills will require a larger size chuck key than the smaller drills.
Turn the chuck to open the jaws of the drill to fit the drill bit. The chuck is the cylinder that opens the small jaws at the tip of the drill.
Place the bit into the jaws of the drill. Drill bits will have different types of shafts depending on what they are made for. Make sure that when tightening the jaws that the bit shaft fits snugly against the jaws of the drill.
Press the directional switch so that it is set to drill. The switch will be located on top of the drill, located right above the trigger switch, or it will be a button located closer to the engine housing of the drill.
Squeeze the trigger of drill and hold onto the chuck at the same time to tighten jaws onto drill bit. If you are uncomfortable with this, just tighten the jaws holding the bit by turning the chuck until it is tightened by hand.
Tighten the chuck using the chuck key if possible. Most battery operated drills will not have a chuck key to tighten the bit. The drills with cords will have a tool called a chuck key hanging from the cord. Place the little round nub of the key into any of the three holes located at the base of the chuck. The teeth of the key will interlock with the teeth of the drill chuck. Turn the key so that it tightens the jaws of the drill around the drill bit.