Concrete grinders serve a wide variety of purposes and can be used in several different settings. They are used for things like smoothing surfaces, leveling concrete floors, removing paint, and grind down concrete slabs. For commercial contractors, stone fabricators, and DIY enthusiasts, buying an effective, efficient, powerful, and user-safe concrete grinder isn’t the easiest thing to do. Luckily, we cover some of the top concrete surface grinders you can buy to make the choice easier.
Bosch CSG15 is a 5’’ electric surface grinder tool with a powerful 12.5 amps motor for concrete grading, concrete applications, and surface preparation. It offers superb work progress than other options. It was voted best-in-class performance due to an advanced guard system. This unit also has a quality dust guard when grinding concrete. The 4-stage dedicated dust seal system not only protects gears and bearings from dust but also prevents entry of crystalline silica particles into the worker's lungs.
For maximum durability, this concrete polisher features a sealed motor and switch. The flush grinding shroud lets the user grind along walls, while the rotating guard element ensures no part of the guard is lost.The air inlets reduce suction onto the working surface for smoother work progress. Besides, the auxiliary handle has a wraparound design for multiple grip positions regardless of the user’s working angle.
Due to the steady response electronics technology, the high torque motor handles extended and sustained loads by maintaining speed.The Bosch CSG15 concrete surfacing grinder comes complete with a grinder, 5'' cup wheel, dust shroud, spanner wrench, and a carrying case. Plus, it also offers a 1-year limited warranty.
DEWALT DWE46253 is another powerful and effective handheld concrete floor grinder. It's a corded grinder with a brushless motor to reduce downtime of brush replacements. Equipped with a kickback electronic fast brake system, the DEWALT grinder immediately stops the cup wheel with maximum force. The E-clutch protection feature senses the tool’s motion and automatically stops the whole unit in less than one second during any bind-up event, stall, or pinch situation.
This causes less backward movement towards the user and reduces the chances of getting hit by the tool. Thus it offers maximum user protection without compromising performance. Shocks active vibration control eliminates vibrations felt by the user at the side handles. With multiple speed functionality, the wheel speed is adjustable for various applications and grinding discs. Furthermore, the included bail handle provides multiple user-preferred positions. Overall, this DEWALT tool offers high user control, dust collection, and low vibration making it a good choice for any tough material removal job.
The powerful 1900 watts Metabo Renovation grinder is an excellent choice for concrete removal (or any material removal job), spot standing, coatings, and screed exclusion. The high-performance professional concrete 5” 125mm cup wheel is usable on rigid materials. Due to the 3800 to 8200 RPM no load-speed, Vario-Constamatic, and 15 amp Marathon powerful motor, it can effectively handle overload while maintaining a constant speed and still remain easy to handle.
High over-load capacity makes it an excellent grinder for tough continuous use on construction sites. It can seamlessly grind close, near, and along the edges with a built-in folding segment with a robust guard. For best extraction results, the spring-mounted brush rim is capable of adapting any segment height and surface. The Metabo all-purpose vacuum cleaner offers exceptionally effective dust extraction via MPULSE Auto-clean system. The Metabo handheld grinder comes equipped with restart protection and an S-automatic mechanical safety clutch in addition to soft-start.
The ergonomic front grip handle adjusts easily without using any tools. This offers excellent user safety and uniform guidance during operation. The 7.7lbs lightweight tool has wave electronics for customized speed to match material needs. Skilled builders and contractors also appreciate the variable speed control right at the fingertip for ease of operation.
The QuickT SPW702A is a variable speed wet polisher, grinder, and sander machine for concrete countertop, marble, stone, and granite. Mostly used by professional contractors, this tool has an 800W power motor that offers optimum wet/dry polishing speed. Variable speed and finger-operated dial control let you select the required speed with ease for best polishing results. Plus, the heavy head design transfers the entire machine weight on the polishing surface for more pressure, which naturally improves performance.
It comes complete with all the tools needed; 4 polishing pads, a set of backing, and buffing pads. With an integrated quick-connect system, it connects seamlessly to a garden hose. Ease of use features includes water stopper, pressure control, adjustable flow, 120 ̊3-hole water hole for even water distribution, splash guard, and soft jerk-free start. Besides, the adjustable D-handle on top with good-grip is a must-have feature for polishing concrete/stone. With regards to safety, the QuickT is Class-A GFCI for superior electric protection. Rubber covering the handle, double-insulated motor, and industrial-grade 12-feet long cable offers excellent electric shock safety.
The Stadea SWP101K is a 5’’ fully-featured polisher kit designed specifically for wet surface polishing, edge shaping, grinding, coring, and dries polishing. It runs on an 800W power dual torque motor with a gear system to maintain optimal power and contact speed. Moreover, it ensures work accuracy with a soft, jerk-free start. No compromise on electric safety, the Stadea features a double-insulation motor, integrated GFCI security to cut circuit during electrical shock. The 12-feet electric cable along with flexible rubber splash guard offers multi-layered protection to the operator.
Non-intrusive under the waterline, garden hose quick connect, water flow controller, zero dry spots, water pressure control, 3-hole even distribution of water, make it a highly-efficient wet polisher.
Another great thing about this handheld Stadea polisher is the ease of use. Users can change speed while the polisher is in use with just one finger touch. The variable speed control and quick access on/off buttons in the front are easily reachable from the handgrip. Ergonomic grip soft back-handle and top D-handle offer non-tiring more prolonged operation with better control and balance. Then there’s an arbor lock for fast accessories release and a continuous run lock safety switch.
Concrete Grinder Buying Guide
A concrete grinder is a versatile power tool that's used for material removal like glues, coatings, paint, epoxies, screed, and clears up concrete for polishing. It uses abrasive tools to create a tailored, smooth finish on the surface. The tool has a horizontal rotating disc with various wheel attachments. When selecting the right concrete grinder, essential things to consider are the size of a job you have, diamond tools, and grinding discs all depending on what you plan to grind.
Walk-behind vs. handheld - The two common types of concrete grinders include the walk-behind floor grinders to grind larger sections and handheld portable grinders for tight spaces like corners and edges. Walk-behind grinders are heavy-duty and require at least 240V of electric power or propane engine that is not always available on the job site. It's a large and heavy machine designed especially for extensive production work. It is best suitable for larger concrete grinding jobs as means of transportation are necessary. However, a more considerable RPM speed enables it to grind or remove the hardened coating from the larger surface, like concrete floors, more quickly.
For smaller jobs and residential areas, handheld grinders with 110V with 15-20 amp electric motors are a more convenient, easy to handle and cost-effective option than walk behind grinders. Easy to maneuver, the handheld grinders work on horizontal as well as vertical surfaces. They usually hold one diamond grinding cup-wheel that works on a 5-7'' concrete section. This makes them more lightweight and portable. When it comes to stripping applications, a low-speed and high torque concrete grinder is most suitable.
Diamond cup wheel - The diamond cup wheel is mounted on a concrete grinding machine for grind and paint removal purposes. It's made from an industrial-grade diamond segment that's cold-pressed and welded on a plain metal disc. Grind cup wheels have various specifications, strengths, and types depending on the application. It's suspended in a bond made of plastic, metal, resin, etc., and ranked as soft, medium, or hard. Then there are different grits and concentrations of a diamond segment. A soft-bonded cup wheel works best on hard concrete, while a hard-bonded one works better for soft surfaces. The size of the grinding disc will be important depending on the type of job you are doing. A 7-inch diamond grinding disc and 5-inch diamond grinding cup-wheel are common.
Materials with different roughness require different grit/mesh numbers. It’s recommended for initial rough grinding to select a high-quality diamond cup wheel with soft bond and coarse grit to improve work efficiency. Find grinding requires fine-grit segments. By using the right diamond grinding cup wheel, one can prevent undesirable outcomes.
Dust collection - Small particles found in grinding dust, or also known as silica dust, found on construction sites can be harmful to the workers. A concrete grinder with dust attachment, dust extractor, and a collector with filters has become necessary for the user's health safety which makes it important for any construction company to have them. Many of the new concrete grinders are equipped with dust ports or shrouds for silica dust. Every component of the grinding tool needs a practical design to remove dust. An effective dust collection system reduces the spread of airborne dust for a healthy and safe work environment. You can connect the vacuum to the dust ports for easy dust extraction and clean-up.
Safety - Handheld concrete grinders should have all safety features for utmost user safety. For electric-corded grinders, ensure they have a safety lock, guards, and GFCI for electric shock protection. Another safety feature to look for is the fast brake system to stop the wheel cup and motor immediately. Never use the grinding wheel without a guard since it protects the user from flying debris and restricts the attachment of an over-sized wheel. Don't forget to wear personal protective equipment like gloves, safety goggles, and masks while operating the concrete floor grinder.