Now that you have marked the drilling spot and you have taken all the necessary precaution if you want to drill a large hole begin by fitting a smaller bit on your tool then drill a small or medium hole before you change your bit to the appropriate size.
How to drill hole in concrete wall.
Next get into position to drill by planting your feet firmly on.
Drill forward with steady light pressure.
Start the drill at its lowest speed for better control.
Drill the guide hole to a depth of 1 8 to inch.
Drill the hole again until it s the right thickness.
Next turn on the drill s hammer function and start drilling applying firm but not forceful pressure.
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Do not force the drill.
Once the core drill starts to go through the concrete wall maintain a smooth low speed.
Increase the drill bit by 1 8 inch each time.
Then drill a shallow pilot hole using a low speed or short bursts.
Once you ve drilled down as deep as you need to go change to a slightly larger drill bit.
Don your goggles then insert the appropriate tungsten carbide masonry drill bit for your desired hole size into the hammer drill.
Position the tip of the drill on the mark you made on the concrete and keep the drill perpendicular as you drill.
If any time you feel the drill bogging down back off some.
Once you have the right drill and drill bit mark the spot on the concrete you want to drill through.
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After the core drill has gone through the wall up to about 0 5 inches it is advisable to unscrew the guide drill bit at this point.
Start drilling slowly with the attached guide drill on the core drill.
To drill into concrete use a hammer drill with a carbide tipped masonry bit.
Begin drilling into the concrete applying steady pressure on the drill.