Things You'll Need
Masonry grinding pad
Grease pencil or marker
Many reasons exist for you to use an angle grinder to grind concrete. For example, you may want to grind a drain groove into a concrete walkway. You may need to scuff the surface of a patio surface that is too smooth. Alternatively, you may want to grind a radius onto the top of a stair tread to remove a sharp edge. Using an angle grinder is not a process that requires finesse but it does require that you pay attention to details; otherwise, the grinder could slip out of your hand and hurt you.
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Press the lock pin located on the housing of the angle grinder to lock the grinding pad in place. Place the nipples on the spanner wrench into the two holes on the bottom of the retaining nut that holds the grinding pad in place and then loosen the nut. Remove the nut and the old pad and then install a pad suitable for masonry work. Thread the retaining nut in place and tighten it with the spanner wrench. The spanner wrench is supplied with your grinder.
Mark the width of the area you want to cut into the concrete with a grease pencil or marker. This shows you the width of the cut.
Hold the grinding pad at a 45-degree angle to the concrete and pull the trigger. Hold the grinder away from you, make contact with the concrete and then pull the grinder towards you in a smooth, slow and consistent manner. Do not force the grinder into the concrete. Allow the grinder time to cut into the concrete. This will minimize heat buildup and prevent the concrete from prematurely destroying the pad.
Always wear proper eye and ear protection at all times when working with an angle grinder.