There are different types of concrete grinding machines on the market. And, each has built-in features and can be used for removing paints, spills, dust, imperfections, and blemishes, smoothing uneven surfaces or protrusions. Each grinding machines has built-in features and can be used for some or any of the above applications.
Planetary concrete grinders leave very few tool marks because they have either three or four grinding wheels turning clockwise and these are connected to a turntable that turns anti clockwise. The four head machines have two of the heads rotating clockwise and the opposite two rotating anti clockwise as well as the turntable rotating and these have the advantage of being very smooth to operate with almost no lateral forces that would require physical effort to control. These machines are ideal to achieve polished concrete with their smooth grinding finish and the ability to easily replace the diamond grinding wheels to move through the different grit sizes.
Another type of concrete grinder is the eight wheel, flat type with four of the grinding wheels rotating clockwise and four rotating anti clockwise. These machines also produce excellent results for polished concrete or just for preparation of concrete floors for cleaning or for coatings application. They are also designed for quick and easy replacement of the grinding wheels and do not suffer from lateral forces like the three headed planetary machines or the single headed machines.All of the above equipment can grind floors easily except for the corners and edges. The edges require an edge grinder that can place the grinding wheel against a wall and run along the wall to even the grinding up to the edge. There are walk behind concrete grinders for this purpose that have either adjustable wheel tracking axles at the rear or a grinding head that can swing to the left or right to enable the grinding wheel to run along the wall while the concrete grinder is move parallel to the wall.
The most common type of floor edger is an angle grinder with a dust shroud attached and a diamond grinding wheel underneath. These either have a cutaway section for the wheel to reach the wall edge or they have a flat seal section where the wheel protrudes slightly which has better dust control. There is also a type of dust shroud that has two flat sections for getting into the corners and a sit down style of angle grinder where the operator sits on a stool and floats the concrete grinder along the wall edge using handles located on the grinder to prevent bending. This type has the added advantage of being close enough to the floor to see if it has been ground properly.
Yet another attractive feature is that the grinding head and cup wheel is spring loaded. This keeps the grinder flat and makes it convenient to have a flat and shiny concrete surface. However, be sure to buy diamond plated cup wheels suitable for use with your grinder and specifically designed for grinding concrete. Only use diamond plated cup wheels on concrete grinders.
Learn more about Concrete Grinding Equipment
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