Concrete grinding is the process of removing high points, contaminants, and loose material from a concrete surface using a grinding machine. When grinding concrete, the bond of the diamond shoes should normally be the opposite of the concrete, use a soft bond on hard concrete, use a medium bond bond on medium concrete and a hard bond on soft concrete. Use a larger diamond grit (lower number) for faster removal of concrete and for harder concrete.

Grinding hard concrete does not produce much dust, and it is usually soft and non abrasive. The diamonds cut, blunt and break as normal, but the metal bond surrounding them is not worn away easily without the dust, so the diamonds are not exposed as much as with soft concrete. The diamond segment glazes over and stops working and rubs on the floor instead of cutting it. You can use larger diamonds (around 25 grit) to increase dust production. Also, reduce the surface area with fewer segments to increase the weight per square centimetre.

Grinding soft concrete usually produces sufficient gritty, abrasive dust that will wear away the bond and expose the diamonds adequately. In fact, too much dust can cause the grinding wheel to wear too fast, so vacuum up excess dust. Reduce the weight on the wheel or increase the surface area with more segments to reduce the weight per square centimetre.

Inspect your grinding shoes regularly to make sure diamonds are exposed adequately  and that they are not overheating . Even the best shoes will perform badly if used in the wrong application.

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