A concrete grinder is a heavy floor machine fitted with diamond tooling. It removes old coatings, levels high spots, and opens up the concrete so new coatings can bond.
Understanding the Concrete Grinder
A concrete grinder spins one or more heads with diamond segments across the floor. The diamonds cut into the surface to clean it and create a profile for coatings to grip. The same machine is used for polishing when fitted with finer tooling. Grinders connect to a dust extractor to control silica dust.
Types of Concrete Grinders
Walk-behind planetary grinders have multiple rotating heads and cover large floors fast. Single-head grinders are lighter and easier to move in smaller rooms. Handheld angle grinders with shrouds handle edges, corners, and stairs. Sizes range from about 10 inch handhelds to 30 inch and larger walk-behind units.
Grinder vs. Shot Blaster
A grinder works well for thin coatings, smooth slabs, and polishing. A shot blaster is faster on large open areas and leaves a rougher profile. Many crews use both, with a shot blaster for the field and a grinder for edges and detail work.
Practical Tips for Using a Concrete Grinder
Pick the diamond bond that matches the hardness of the concrete. Always connect a HEPA dust extractor and wear a respirator rated for silica dust. Overlap passes and keep the machine moving so you do not gouge the slab. Check the tooling often and replace worn segments.
Also Called
Floor grinder, Diamond grinder
