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4.5
I'm remodeling a basement and ordered this to prepare the cement subfloor for vinyl plank install. During this process, I've learned there's hard concrete and softer concrete. I'm able to grind through the softer concrete easily. For the harder concrete, it went much slower but this grinding wheel held up. Happy with the purchase.This was a great value! Take a look at the photos to compare to the on-the-shelf model at the big-box hardware store Save $40 to $50 with this. This wheel did a great job of grinding down some rough concrete around the edge of my garage. You can see that the teeth are about worn off but it was still chewing through some rough spots when I finished this job. I grinded (ground?) about 75 linear feet around the edge of my garage floor getting ready to put a smooth slurry coat and then epoxy paint. I'm done with this job but just ordered another one of these wheels because we are doing a home renovation and still have some work to do. I rented a machine to grind most of the floor but needed this to get close to the edges as the machine left like 1 &1/2 inches where it couldn't get close to the wall. It's a pretty aggressive grind and will leave lines in the concrete. It will also make a lot of dust so I invested in a dust shield that allowed me to hook up my shop vac. It worked great!We recently had to replace about a thousand square feet of outdoor tile on a concrete slab. We had done a similar project two years ago on an adjacent area, so knowing what we were getting into, we bought several wheels to help remove the old thin set. We used a new DeWalt 13amp grinder with all of them. On the previous project we used the "4 inch Diamond Segment Grinding Cup Wheel Disc Grinder Concrete Granite Stone" (blue disc) at just over eleven dollars and it worked well and lasted for about 350 square feet. We decided that this time we would try several to see if we could get more square footage out of a blade or more importantly, if we could work less hard to remove the material (i.e. we hoped another blade would be more aggressive and reduce the effort needed). Following are all of the blades including the one this review is attached to. We hope this breakdown will help.DeWalt DW4774 4-1/2" Double Row:.This blade seemed to be the best of the bunch, but at thirty-five dollars, we question whether or not it was noticeably superior enough to justify the cost. As to durability, we finished the last 200 square feet of the project with this blade and it was still going strong which might be the justification for the price.OCR 4" Concrete Turbo Diamond Grinding Cup Wheel Three Row....:This wheel did very well and for the lower priced group lasted just shy of the 4" Diamond Segment Grinding Cup Wheel Disc... (Blue version).It ultimately lasted for about 300 square feet.4" Diamond Segment Grinding Cup Wheel Disc... (Blue version):We liked this one the best of the inexpensive group (and have ordered extras). It consistently got about 350 square feet and seemed to wear out evenly. A really good buy for the dollar.Whirlwind USA GPST 4.5" Heavy Duty Grinding Cup Wheel:This was the most expensive of the group and at first we were very disappointed in it. After using it for a while though, we came to realize it is better suited for polishing work rather than fast removal of large amounts of material. It did not seem to wear much at all for the work it did and we will look forward to using it when we need to provide a smooth finished surface. For just grinding, don't pay the high price, it is definitely not worth it.4" Diamond Segment Double Row Grinding Cup Wheel Disc.... (Black Version):This was the least competent of the bunch. It worked reasonably well but only lasted for about 200 square feet. At the end, it literally lost all of its teeth and was just a smooth flat wheel. The others in the twelve dollar range were much better buys.In summary, we feel that if you are only going to grind a smaller area of concrete (or like material) and it is not a massive project like ours, the inexpensive blades are a great buy and do just as good a job, if not better.Does a good job, for being an unknown player in the grinding game. [I never heard of the company before finding this product on amazon].We ultimately needed to get one of these, to remedy an issue from our local city office. They mailed out FIX IT Notices for "Uneven sidewalk" segments.We first tried using those $2 to $4 so-called Masonry/cement grinding wheels. What a waste of money!Those are the cheap wheels hanging right above the side grinders at homedepot or lowes.Had I known just How Much better a cupping wheel like this works, I would have bought it initially.Almost a night and day difference between how this diamond cupping wheel works Vs. an el-cheapo $2 or $3 masonry wheel works.The concrete and its dust really were something to behold when this wheel went to work on those "uneven edges".Clouds of dust were produced without hardly any pressure being applied. I just let the cupping wheel float over the area needing to be reduced.Was easy to get a nice, flat, clean looking concrete junction between the two adjacent concrete segments of my sidewalk.NOTE: I tried to throw some dollars at local area businesses but their product selection and pricing was just too high.When I went to Home Depot, I saw only the well known brands like Bosch, Dewalt, Milwaukee cupping wheel grinder pieces.However, the prices on those also were "premium", starting at like $50 and going up from there.Pros:- cheaper than name brand cupping wheels- seems to last quite a long time, even when working with cement and/or concrete- arrival was a mixed bag. Supposed to be available for receipt by week's end, but then was told it would be a few days later. Ultimately it arrived a couple days earlier than the "will be late" message indicated.Final result: arrived like a day later than first indicated, in time for my needing it, so not a problem for my needs that week.CONs:- can wear down a bit faster if you bear down on it quite a bit. (Another family member took a more aggressive approach than I did and while they finished removing concrete faster than I did, the blade wore down a bit more than when I used it).Comments:- it's probably been said in a thousand places online, but these cupping wheels and use on cement/concrete WILL produce a ton of dust.When I used it, we were outside and had a nice strong wind. So we just setup upwind from the grinder's dust output. Usage inside a building would definitely benefit from some sort of vacuum system for dust.- previously when helping a relative install a new kitchen tile floor we used a large handled 9" scraper blade. Which was painful and slow going.I hadn't known about diamond cupping wheels those many years ago.Next time we re-tile, I will try a cupping wheel like this to remove old tile, adhesive, grout, etc.I'm currently renovating my basement, and the bathroom was finished with terracotta tiles. We were able to chip these up with a mallet and cold chisel, but once we got the tiles up the thinset was very uneven and we needed to level it out for a new subfloor. It was a small space (6x7 feet), so we didn't want to rent a tool from a hardware store, and decided to try this with my angle grinder. I was initially concerned with this because of the price, as all of the other grinding wheels are more expensive, but since it was a small space decided to give this a try. Fits my Makita BGA452Z grinder perfectly. Comes packaged in hard plastic, with some hilarious instructions (see the photo: "The safe use. It is forbidden to illegal"). Very effective, it makes a HUGE amount of dust - make sure you get a dust shroud.What I like- Very reasonably priced- Does what it is supposed to- Remained 'sharp' after grinding down about 42 square feet of thinsetWhat I dislike- Nothing. This is a great product.I imagine something priced like this would not last on bigger jobs, but it seemed pretty sharp after my job. All in all, I'm very happy with this purchase.Pros:Cuts through concrete like butter.Very sharp and effective right out of the packageCons:If you are using this grinder for a detail-oriented project light trying to level concrete patch, you may find yourself gouging into the ground as every little slip of your hand will result in a knick on the ground.All in all, the grinding cup works as advertised. However I would exercise caution when working on delicate projects.Arrived on time. Works great on concrete. I had to level out some areas before laying down flooring. I used this with a Milwuakee grinder and it was able to grind down a 2' area in no time. Make sure you where a mask and allow for 2 hours of clean up and an hour of settle time before clean up. Great product and a fraction of the cost compared to Lowes/Home Depot. I only needed this for a couple areas, so I am unsure on the longevity of the product?This worked great at removing thinset from the back of my ceramic tiles. I had originally tried just a grinding disk but that did not work, you really need the diamond grit disk.
