I have therefore honed to about 2 weeks old concrete in front of my garage. The area is about 30cm x 220cm with 2 driveways. I operated the grinding head first on a small machine with 800 watts from the disc lower. After about 10 min., The machine was overheated and died. That was also grind tedious, because the speed with a little more pressure immediately went to the basement. Then I have the grinding wheel on a brand machine mounted for normal discs 250 and 2200 watts. So that I could grind the concrete in a short time. I have to also a Bosch exhaust hood used with vacuum cleaner connection. One should make sure, otherwise it extremely dusty. After the grinding work I could find minimal wear on the pane.
