When it comes to grinding, finishing and polishing a concrete floor, there are hundreds of different products to choose from. Some concrete grinders are better than others, and it’s our job to separate the good from the bad. If you are in the market for the best concrete grinder, here are five product reviews and a buyers’ guide to help make your decision considerably easier.
|MK Diamond 166859|
|Bosch 1773AK||15 lbs||4.7/5|
(Best for the Money)
|Metabo US606467800||22 lbs||4.3/5|
|Makita VC4710X1||13 lbs||3.9/5|
If you are looking for the very best concrete floor polisher, look no further than the MK Diamond. While it is obviously a walk-behind surface grinder, it’s not overly expensive or designed exclusively for industrial usage. The simple, sleek design and moderate price tag make it ideal for both industrial applications and smaller projects. It attaches to a traditional industrial shop hoover to wick away the dust and debris while it’s in use, reducing the risk of respiratory problems. It’s also incredibly lightweight and portable for a floor grinder of this size. The handles are wide and comfortable and even removable to allow for more convenient storage.
The diamond cup wheels are powered by a 15 amp electric motor, producing RPM’s of up to 3500. It’s ideal for concrete, marble, rubber, adhesives or anything else that needs grinding off the floor. It’s undoubtedly the best angle grinder for concrete and if your budget permits, we highly recommend going with this one.
In a close second is the Bosch 1773AK. Although it’s a handheld concrete grinder, it competes with the MK Diamond in almost every department. Its 10-amp electric motor produces RPM’s up to 11,000, allowing the 5-inch diamond-cup wheel disc to grind, buffer and polish any concrete. The reason why it’s in second is simple: It’s not ideal for larger projects like the MK Diamond. With that being said, the Bosch 1773AK can work in tighter areas, making it suitable for smaller and irregularly shaped areas.
The wrap-around auxiliary handle is comfortable to hold and makes handling a breeze. The vacuum attachment fits most shop vacuums and provides the perfect exit route for any dust and debris. It’s portable, practical, easy to use and excellent value for money. If you would prefer a handheld to a walk-behind concrete grinder, this is the one we would recommend.
The Bosch CSG15 is a surprisingly powerful and versatile floor grinder that can be used for both concrete grinding and finishing. It’s lightweight at just 23 lbs, and the compact nature makes it ideal for grinding those harder to reach spaces. The single diamond cup-wheel is only 5″ in diameter and is easily detached and replaced. The diamond cup used on this model is ideal for both concrete grinding and surface polishing. The auxiliary handle is ideally situated to equally balance the weight making long grinding sessions comfortable.
The three-part dust guard does a fantastic job of wicking away the debris and dust that the grinding plate kicks up. It’s one of the best guard systems we have ever seen. Considering the price point, we were surprised how well the Bosch CSG15 performed in all areas. It’s not going to perform as well as the MK Diamond, but a hand grinder never will. At this price point, there are no better concrete floor grinders on the market.
The small, ergonomically designed concrete grinder from Metabo is as portable as they come. At just 8 inches tall (including the handle) and weighing only 22 lbs, this high-quality concrete grinder was designed with portability in mind. It’s ideal for grinding both concrete and some metal materials, and it works well for all stages of finishing. The best feature is the dust shroud. It’s one of the best on the market for protecting you against respiratory issues. If your job requirements include a lot of grinding, it’s always a good idea to choose a grinder that does an excellent job of protecting your lungs from runaway dust.
The single, 7” disc makes it the largest on our list. If you are interested in grinding more surface area with every spin of the diamond-cup wheel, this is probably your best option. Overall, it’s a portable, compact and easy-to-use concrete grinder that deserves its spot on this list.
Being avid users of Makita tools, we were expecting good things from the VC4710X1. Unfortunately, not only did it fail to surpass our expectations, it completely changed our opinion of the entire Makita brand. To say this wet/dry concrete grinder with a built-in vacuum is overpriced would be an understatement. We loved the idea of an integrated vacuum to collect dust while we were using it continuously, but it just failed to work. The sound was almost unbearable, and the heat it was producing was worrying. The power was underwhelming and the vacuum connector detached from the grinder at least a dozen times during our tests.
What disappointed us the most was the blatant lie that we uncovered in their product description. The Makita VC is marketed as having “self-cleaning” filter which will help to prolong its shelf-life, however, after just a few days of using the concrete grinder the filter was blocked with dust and was struggling to collect anything else. It’s the complete opposite of a self-cleaning filter.
Overall, Makita has really disappointed us with this one. There are four other concrete grinders on this list so do yourself a favor and stick with one of those.
If you have taken the time to read our concrete grinder reviews and you are still unsure about which one to choose, here is a break down of the different factors that you need to consider before making your decision. The price of a concrete floor grinder does not indicate it’s quality. You need to choose the best product for your specific needs. Without further ado, let’s jump straight in.
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The disc is one of the most important aspects of the concrete floor grinder. More specifically, it’s the size and the material of the disc that are the most important factors to consider. The material of the disc will vary depending on what sort of material you are grinding. While concrete is the most common use for a floor grinder, they can also be used on marble and granite.
The most commonly used materials for grinding discs are silicon carbide and diamond tools. The term diamond tools simply refer to diamond-studded materials that are attached to the grinding disc. When it comes to the material, the more expensive a grinding disc is, the more diamond is usually involved.
The other important factor to consider is the size of the disc. The bigger the disc, the more surface area it can cover per spin. With that being said, there are several concrete floor grinders that utilize multiple discs at the same time. These are referred to as dual-disc and triple-disc. The grinding discs are generally between 8 and 12 inches in diameter.
The depth of grind simply refers to the level of grinding that takes place per revolution of the blade. Smaller, handheld grinders will have a much lower depth of grind when compared to the walk-behind industrial floor grinders. The walk-behind floor grinders typically utilize multiple discs at the same time which will obviously produce a better depth of grind.
For larger surface areas, a walk-behind grinder will get the job done quicker and more efficiently. For smaller tasks, a handheld grinder will be more than sufficient.
Depending on the sort of application you need it for, a walk-behind concrete floor grinder might be overkill for most people. Unless you need to polish a large surface area, a handheld grinder is usually the best option. They are lightweight, compact, easy to transport and great for hard to reach places.
Handheld concrete floor grinders downfall is the obvious fact that they are smaller and require more effort from the user to work. If the floor you are working on is more than a few square meters, it will make more sense to choose a walk-behind floor grinder instead.
All concrete floor grinders on the market will use either gas or electric as their power source. Both have advantages and disadvantages, so it’s up to you to decide how you want to fuel your machine. If electricity is widely available in the area that you are grinding, it’s more than likely the better option. If you are working somewhere remote, for example, the middle of a building site, a gas-powered grinder may be your only option.
Regardless of whether you need a concrete grinder for a home DIY project or a professional setting, choosing the best product for your needs the first time will save you a considerable amount of time, stress and money. Hopefully, our concrete grinder reviews have helped to clear the fog and made your decision easier.
If you are still struggling to decide which is the best grinder for you, consider sticking with the MK Diamond or the Bosch 1773AK. They both are powerful, easy to use and reasonably priced. The only difference is that the MK diamond is a walk-behind and the Bosch is a handheld. They both have their own advantages and disadvantages, but they are both fantastic concrete grinders that will serve you well and help you get the job done correctly.