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I don't know about routing granite, but it's easily cut with your average wet saw.

Now if you could find a bit for your router that was covered in diamonds, that should work. But maybe carbide bit would work as well. Do they make diamond bits for routers?

Not sure if it would need water or not, but you could easily take care of that.

Are you trying to cut it neatly? Or do some sort of design?
 

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Discussion Starter #4 (Edited)
Dan, I'm living in a land that makes concrete copies of ancient sculptures.

Apart from that, I'm a cheapskate. Having paid over 700 US$ for the worktop, I dont particularly want to pay twice for the same piece.

I had a much smaller granite top that I tried to remove when I enlarged the outside kitchen area, but it broke. Because i was buying the new piece, the company cut the old piece square and rounded over the edges for free. So I have one 30" (75cm) square coffee table, I thought a smaller oval, about 30" x 15" would be nice.

What I really would like is a round over edge, I dont see any way I can make that evenly around a permanently curving edge with a disc cutter.
No fancy designs, just a rolled edge oval
 

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Monuments are cut with specialty bits, not sure what kind, but they create a ton of dust, and water is used for lubrication, as well as dust control. Haven't cut or carved granite, but have used a diamond drag bit with my CNC router on granite for some pretty impressive floral designs. A diamond drag bit just scratches the surface, with the router turned off, basically just a bit holder. Not going to help with rounding over, but food for thought for the top.
 

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Bob, do you have a picture of the piece?
 

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Dan, I'm living in a land that makes concrete copies of ancient sculptures.

Apart from that, I'm a cheapskate. Having paid over 700 US$ for the worktop, I dont particularly want to pay twice for the same piece.

I had a much smaller granite top that I tried to remove when I enlarged the outside kitchen area, but it broke. Because i was buying the new piece, the company cut the old piece square and rounded over the edges for free. So I have one 30" (75cm) square coffee table, I thought a smaller oval, about 30" x 15" would be nice.

What I really would like is a round over edge, I dont see any way I can make that evenly around a permanently curving edge with a disc cutter.
No fancy designs, just a rolled edge oval
It cannot be done with a router, end of story. N
 

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The edge can be rounded over with a series of small grinding/sanding wheels in your angle grinder. But they are not cheap.

Somewhere on YT there are videos of this method, and the edge ends up being polished the same as the surface.

I needed to smooth over some edges on some pink marble tile a few years ago, but it ended up being cost prohibitive.
 

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havent bothered with a picture. its a cut out for a sink, dark grey granite, 30" long, about 20" across oval shaped, and an inch thick.

looks like i need to ask the company nicely because its not worth spending large sums of money on specialist bits.
Probably the best idea.
 

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we used either silica carbide paper or disks impregnated with diamonds of various grits.
The disk were used with an offset grinder wet & costed about $100 usd about 10 yrs ago.
Check the internet for THK Diamonds out of Hong Kong for diamond stuff--pretty reasonable.
the silica was used wrapped around a wooden dowel to form the cove.
Eased or round over edges were rather quick & easy with the diamonds
 

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Bob

When we had our kitchen counter tops replaced with granite, we actually bought the new granite counter tops from a "monuments" place, you know that service the cemetery industry. Don't laugh, they work with granite every day, were a lot less expensive then a counter top business and did a great job. Yes, the advertise kitchen counters in their show room. Everything was measured/laid out with some new fangled laser machine and the counter tops fit perfectly. Included the sink cut out, the cut out for the slide in gas range, etc. The initial cut was done on a CNC machine probably, but the final fit was done with a grinder.

You must have one of these businesses in your area - you might want to check to see what they'll charge you to do the shaping for you.
 
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