How To Cut A Granite Slab.
Cutting a granite slab may not be as complicated as you think. Start by making 4 non-connected straight cuts leaving each cut 2″ shy of the adjacent cut. Then, use a core drill for connecting the cuts. You now have a hole with some really funky looking “corners”. A diamond core bit like this one is best for this job. It’s dry cutting, and will go on any electric angle grinder.
Next, you take a grinding drum and grind that “corner” back into an inside arc. The grinding drum’s diameter will be dictated by the radius of the arc you want. Grinding drums with 1″ - 3″ diameters are here.
If only reading about it isn’t good enouigh, you can see this process demonstrated on a DVD video titled, “The undermount sink from start to finish”
If you’re cutting tiles, you could cut the tile from both sides, and tilt the tile up in the tile saw to get it close, but you may still want to finish grinding the inside arc with the diamond brazed grinding drum.
Either way, you will have to polish it when it’s ground to match the face of the stone tiles. This all applies when you are doing an undermount sink… where it will all be visible. If it is not going to be visible then finishing it is unnecessary. Just make sure the hole is big enough to accommodate the sink and small enough where the sink flange will cover it.
