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Granite Cutout

What tool is used to make a sink cutout in 2cm granite ? I have been told to use a contour blade but I just don't get it would work.

Thanks, Curt

Reply to
crhras
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To install a new cooktop I had to enlarge the existing cutout in my 3/4" granite countertop. I used a 4 1/2" angle grinder with a diamond masonry disk. This worked like a charm. You will need a good quality respirator (not a nuisance dust mask) and eye protection.

Jeff

Reply to
Jeff

That's what I thought. So you don't cut it, you kinda grind it, huh ? Thanks very much for your response.

Reply to
crhras

Some things are best left to the experts and in my humble opinion, cutting granite definitely falls into that category. The results of an error may be unfixable.

Call a local granite fabricator and see what they will charge. I had an extra hole drilled in my countertop after installation for a soap dispenser. It cost me $100. Well worth it considering what a mess I could have made in a $3,500 piece of stone not to mention what I would have had to listen to from my wife if I had screwed it up.

Reply to
John Reddy

you cut it... the diamond blade will do it easily...

Jeff

Reply to
Jeff

I used this grinder:

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with this blade:
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Jeff

Reply to
Jeff

Right, I've done a ton of cutting and it's cake but in order to get the nice rounded edges for an underrmount sink you need to grind, right ? Someone told me to use a contour blade. I bought one but I'm not sure how to use it.

Curt

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Reply to
crhras

Don't have a wife, brother, and that's why I'm cuttin the granite.

Reply to
crhras

Saw them do this the other day on this old house the episode before the wrap party for the Boston home they are finishing this week. He put a diamond hole saw in a

4 1/2 inch angle grinder. They build a little dam around the hole site with duct tape and filled it with water to lube the hole. Looking at that bit I would bet it cost more than a hundred bucks.

peace dawg : :

Reply to
Deputy Dumbya Dawg

Bingo!!

They got the tools, they got the expertise. You got the idea you can do it yourself.

All I'm saying is weigh the options.

Reply to
John Reddy

Diamond core bits can be rented rather cheaply.

Reply to
Chas Hurst

What are you putting in the cutout that requires nice round corners? Both my cast iron sink, and JennAir cooktop have wide mounting flanges, that will hide rough corners in the cutout.

When the original professional installer put in the countertop the cutouts were only partially made before the countertop was set. The long straight cuts were made in his shop but the corners were still attached. Once the countertop was installed he built cribbing to support the cutout from bellow, then used an angle grinder to complete the cut. Admittedly the corners were rough, but the appliance mounting flange covered them and all was well. When I re-cut the hole for my new JennAir cooktop it actually required square corners.

I few thoughts about the diamond cutting disk I used. It is designed for straight cuts, and while it can be to shape a curve it requires some patience and skill. There might be other disks or bits that are better suited for curved profiles.

Jeff

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Reply to
Jeff

I'm using under mount sinks which don't have flanges to hide the cutout.

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Reply to
crhras

From my calculations, if I spend $1000 on tools, I'm still coming out way ahead on this project alone given the amount of granite I need and the way fabricators mark the stone up.

Reply to
crhras

Finally.... A chance for me to give an opinion........... Undermount sinks are a fad, and overrated. The overhang of the countertop where it mates with the fixture is a difficult spot to keep clean and a great location for bacteria to grow and stains to set.

Jeff

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Reply to
Jeff

Not to mention you'll never be able to change the sink again.

Reply to
Steve Barker

The countertop shouldn't overhang the sink.

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Reply to
crhras

Of course you can change the sink.

Reply to
crhras

Oh really? And just how is the sink supported? You'd have to remove whatever is holding it there to get a new on in. And then it would have to fit through the cabinet doors. Do explain.....

Reply to
Steve Barker

From what you have posted you will have a BIG mess if you try to do this yourself. You have stated that you are trying to cut a finised moulded cutout in a granite slab for an undermount sink. This means you will have to cut a very precise hole and then mould the edge of this hole with a router and then polish that edge. This will be a very involved process in the field. You can look at routers and bits for this purpose at places like

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They also sell polishing kits/pads and abrasives for the subsequent steps. The router bit alone might cost 400-500 dollars. This process is normally done in a shop with a CNC router. This is not something you do with a hand held woodworking router or a grinder.

If I were you and I were really trying to pull this off on my own I would go for a square edge sink hole. You would need a diamond core bit to match your needed radius at the sink corners (square/rectangular sink), a diamond blade, and a polishing set. It will be a LOT of work and a LOT of mess and will probably result in a substandard result as compared to a shop doing it but that may be acceptable to you. You could punch holes at each corner with the core bit, cut to those holes with a diamond blade, then polish a day or two. The end result could be anything from a disaster to somewhat acceptable.

If the hole needs to be oval, round, or must have a routed edge, I would not even consider doing it.

Mark

Reply to
M&S

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