Reddit reviews OCR 4" Concrete Turbo Diamond Grinding Cup Wheel Three Row Turbo Cup Disc Grinder for Angle Grinder 12 Segs Heavy Duty (Yellow 12segs B)
We found 3 Reddit comments about OCR 4" Concrete Turbo Diamond Grinding Cup Wheel Three Row Turbo Cup Disc Grinder for Angle Grinder 12 Segs Heavy Duty (Yellow 12segs B). Here are the top ones, ranked by their Reddit score.
Heavy Duty Contractor PRO Grade 4 Inch Grinding Wheel.Large grinding segments with heat treated cup design.This aggressive turbo cup grinding wheel provides for very fast cutting action on masonry, stone and concrete.Three row design for grinding granite, marble, rock and concrete, use Dry/Wet to smooth Concrete or Field Stone.Suitable for use on grinding on marble, tile, concrete and rock.
Also if you want to expose aggregate you'll want a grinder wheel like this. Even at 50 grit the it will take you forever to expose aggregate. This one will uncover aggregate in about 5 seconds. It will attach to any 5/8-11 polisher. https://www.amazon.com/Ocr-Concrete-Diamond-Grinding-Grinder/dp/B01CQQR3DW/ref=sr_1_4?ie=UTF8&qid=1479154313&sr=8-4&keywords=diamond+cup+wheel
dry,
https://www.amazon.ca/Ocr-Concrete-Diamond-Grinding-Grinder/dp/B01CQQR3DW/ref=asc_df_B01CQQR3DW/?tag=googleshopc0c-20&linkCode=df0&hvadid=292953024923&hvpos=1o7&hvnetw=g&hvrand=8380050951177615494&hvpone=&hvptwo=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=1001920&hvtargid=pla-493842304061&psc=1
I haven't used one on a regular corderite shelf. Only silca carbide. I suspect you'd need to be a lot more careful with corderite. That said, I use silica carbide for bisque firings too, they're more expensive but it's worth it.
If you go the sanding route (which may not be the best way to go), you do NOT want to use diamond polishing pads. Those are for polishing, as in turning smooth concrete into mirror finish concrete. Not for something as aggressive as what you're looking to do.
You'd want a diamond grinding cup like this one:
https://www.amazon.com/dp/B01CQQR3DW/ref=cm_sw_r_cp_apa_i_I1eCCbNMJCFJW
With an angle grinder. It'll grind the concrete down to a finish that's smooth to the touch. It will go quick, less than an hour.
It will be MESSY. Grinding concrete creates a bunch of fine concrete dust that gets in your face, eyes, nose, etc. You'll want goggles and a face mask.