Length - 05:37 Find Concrete Countertop Supplies Award-winning designer Fu-Tung Cheng discusses how to properly select and use concrete hand grinders to fabricate concrete countertops. Cheng uses a dry grinder. The reason a dry grinder is selected in certain situations is that wet grinders are often not practical when working, for example, in someone's home. When selecting a grinder, look for the following features. Any quality grinder will come with a dust-collection bag and shroud. This will automatically collect and store any air-born dust particles created during the concrete grinding process. The dust that is collected can be emptied into the trash. This grinder also has a built-in circuit breaker to prevent blowing a circuit in a home or workshop. Another nice feature is that the grinder has a shroud of bristles that prevent dust from shooting out the sides of the grinders and polluting the air. When grinding on countertops or floors, it's important to be able to grind up against corners. This grinder can reach within an 1/8-inch of a wall or vertical barrier. Yet another thoughtful feature in this grinder is that the grinding head and cup wheel is spring loaded. This helps keep the grinder flat and makes it easier to create a flat concrete surface. Because grinders operate at around 8,700 RPM (revolutions per minute) it should be noted that this tool should only be used for aggressive concrete grinding. This is not a polisher. Polishing pads should not be used on a grinder. Only use diamond plated cup wheels on concrete grinders. A grinder would be used on a concrete countertop, for example, when the surface has been poured and cured but there is a defect in the surface. Either the casting table was not flat or the troweling was done poorly and there is hump in the surface. The grinder can be used before the countertop is polished to flatten the surface. In addition, with poured in place countertops there may be times where air has been trapped in the countertop leaving a depression. Here, aggressive material needs to be removed so a grinder can be used.
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