Thread: Cutting granite bench tops

are you using "real" stone or an enginered stone.

Real stone, not synthetic or composite. Probably Chinese or Indian. Black & hard.

maybe get the front edges factory cut and polished, then just trim the back to suit your wall. diamond disk in grinder would be worth a shoot but very messy unless you wet it down. you will have it take it slow whe cutting..
3

Fronts are bullnosed, problem areas are two joins on each change of angle and the sink. Sink s/b ok but jointing worries me. Any suggestions, apart from leave it alone?

When they put in my granite benchtops they cut out the sink & stove openings with angle grinders using diamond cutting wheels . they also beveled the edges the same way . This was 20mm thick stuff.
Mind you these blokes did this for a living they came from gosford so no help there i'm afraid
But if you could get a 5" grinder or larger, a diamond wheel and practice on a spare bit, it wasn't that hard they lent me their grinded and i cut one of the offcuts up for a couple of breadboads to match the bench top SHMBO was very pleased
Not sure of the quality of the diamond wheel however proberly pretty expensive from the cost of the granite and fitting they could afford the best.



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Originally Posted by gnu52

I have a reno underway which includes granite bench tops. No local stone cutter exists and the nearest available is 2 1/2 hours away @ $180 / hr.

Paying $900 for the stone mason to travel to you is maybe not such a bad deal. If you're flexible on when you want him to come you could possibilly talk him down to $500 and a night's accomodation.

If you want to do this yourself the tools I suggest you need are either:
an angle grinder with a diamond blade -- very very messy, and it's difficult to hold a straight line unless you've had lots of practice. or
a dustless cutter (Makita make one) connected to a good dust extractor. The Makita dustless cutter is like a portable power saw and can be guided by a battern making straight cuts pretty easy. The dust extractor works and is essential if you want to keep the owner's house clean. The tool is also very handy for cutting cement sheet.

But the big cost is smoothing the exposed edges arround the cut outs and on the edges that but against walls. What needs to be done is akin to sanding the saw marks out of a piece of timber. However with granite you need to use diamond polishing disks to do it and these are not cheap. The guys who installed the granite counter top in my kitchen used an angle grinder style polisher and commented that the polishing disks cost $800 each. Very Ouch for a one off job.

Bill,
if it was my own kitchen I'd probably give it a go, but as it's for a client I'd be getting the specialist in. I've seen them cut on site with a diamond blade in an angle grinder for the cutouts. For cuts to areas that will be seen, a Festo plunge circular saw on a guide rail and the matching dust extractor. Edges polished with stones of varying grit in a 7" sander/polisher. Have to work on getting all the carcasses really level. Tops are glued down with a specialist epoxy - very thick and with grit in it.

Mick

Bill,

Granite dust is very bad for the lungs, if you are into inhaling large amounts of MDF dust this is just as bad over time and it is not advisable to add it to what ever nasties you may have breathed in. Although granite is very tough, and your black could easily be Irish or European as well as Australian, it is also brittle if there is a flaw running through it and the black makes it difficult to spot the flaws. As alluded to the gear for polishing and cutting is expensive and as it is a contract job I would be very reluctant to give it a go, if you crack the slab or stuff the joint the stone mason suddenly does not look so bad after all. Your basic diamond gear will eventually cut it but any flushing along the joins will show as a very clear light grey.

JohnC

Bill
you may want to browse through Hoskin Diamond Products at
http://www.hoskindiamond.com.au/index.htm

a tip, watch the areas around your cutouts. i.e sink and hotplate.

make sure the cabinet carcase has a good size rail on the vertical to support the stone or these areas will be prone to cracking.

if it were me, i would make a set of 3mm ply/mdf templates with the exact detail, scribed to the walls and get the professional to do the joins in his factory. the attempt to do the cutouts myself onsite with a grinder and diamond blade as these dont need to be pretty.

G

could you mark the cuts you need and take it to the stonemason yourself? It would save the hassle of doing it yourself and would be cheaper than getting him to come to you.

Trav

Thanks to you all for your imput which I am now chewing over.
Probably we will take the granite to Brisbane & have it professionally cut from templates of 5mm craftwood.
The mason tells me even if he does the cutting in his workshop I will still have to cut out the sink on site as they are prone to cracking in transport. I see his point.
Again, thanks from Bill

if it was my own kitchen I'd probably give it a go, but as it's for a client I'd be getting the specialist in.

Bill

Listen to Mick's advice. The owner is trying to save a buck at your expense. Who is responsible for replacing the material if you stuff up? Let the owner pay someone who can do the work (it is a relatively small amount in the grand scheme of things), rather than you stressing over something that you are not qualified to do.

Regards from Perth

Derek