03-24-2017, 10:15 AM
I actually use one of those in place of the coarse side of the stone grader, from a tip I picked up on another forum. It isn't used nearly as long as the coarse side of the grader, just a few wheel rotations, but it does a great job of putting life back into the stone for heavy removal work. 
It also doesn't take off much wheel, sadly.
Something I've actually considered is a diamond wheel for my angle grinder, like you'd use for grinding lumps out of concrete. Just run the wheel dry, set up the shop-vac with the dust deputy to capture as much dust as I can outside, and lay into it with the angle grinder until the chip is gone, then dress it until it's flat and curve-free again.
It also doesn't take off much wheel, sadly. Something I've actually considered is a diamond wheel for my angle grinder, like you'd use for grinding lumps out of concrete. Just run the wheel dry, set up the shop-vac with the dust deputy to capture as much dust as I can outside, and lay into it with the angle grinder until the chip is gone, then dress it until it's flat and curve-free again.