Ryobi D552HK English Manual - Page 13

operation WARNING: Before connecting the drill to a power supply source, always check to be sure it is not in lock-on position (depress and release the switch trigger). Failure to ensure that it is not locked-on could result in accidental starting of the drill resulting in possible serious injury. Do not lock the switch trigger in applications where the drill may need to be suddenly stopped. DRILLING See Figure 10.  Depress and release the switch trigger to be sure the drill is in the OFF position before connecting it to power supply.  Check the direction of rotation selector for correct setting (forward or reverse).  Secure the material to be drilled in a vise or with clamps to keep it from turning as the drill bit rotates.  Plug the drill into power supply source.  Hold the drill firmly and place the bit at the point to be drilled.  Depress the switch trigger to start the drill. Do not lock the switch ON for jobs where the drill may need to be stopped suddenly.  Move the drill bit into the workpiece applying only enough pressure to keep the bit cutting. Do not force the drill or apply side pressure to elongate a hole. Let the drill and bit do the work. WARNING: Be prepared for binding at bit breakthrough. When these situations occur, drill has a tendency to grab and kick opposite to the direction of rotation and could cause loss of control when breaking through material. If not prepared, this loss of control can result in possible serious injury.  When drilling hard smooth surfaces use a center punch to mark the desired hole location. This will prevent the drill bit from slipping off center as the hole is started.  When drilling metals use a light oil on the drill bit to keep it from overheating. The oil will prolong the life of the bit and increase the drilling action.  If the bit jams in the workpiece or if the drill stalls, stop the tool immediately. Remove the bit from the workpiece and determine the reason for jamming. 13 Fig. 10