Before you lay the granite slabs back on top, lay down some cardboard to protect the sink overnight. Stone fabricator says they have to cut the sink hole on-site -- in our kitchen. Put another way, cutting and handling granite is an “all or nothing” affair. Make it about 1/8' larger than the line you drew. (I already asked for cutting in the driveway instead, but no.) The more typical choices of metal or porcelain, in contrast, are joined to a surround of a different material using an adhesive. For making a hole in the sink will be the best if you install a drop in sink. This article covers the procedure to cut a hole in those countertops. As long as you have a template of the larger cooktop, all that’s required to create the new opening is a circular saw and a power sander. This cutout is the layout for the sink. He explained that if it was an undermount sink, they'd cut & polish the edge at the shop, but a drop-in sink is rough cut on-site. However, not every kitchen is a maze of 6-foot-wide islands or inside and outside corners. "Hole saws" for larger-diameter holes usually have a drill bit in the center that either sets or benefits from a pilot hole, so tilting might be highly problematic with the hole saw. Granite is a tough and durable stone, making it an ideal choice for countertops. Increasing the size of your cooktop cutout in a granite slab countertop requires the same cutting process used to create the original cutout. After identifying the position of the tap hole, using a diamond tip 35mm hole saw suitable for ceramic or granite kitchen sink or the same size hole saw of your scorch mark. In this first video, I like the way this guy starts the hole but I don’t like how he runs that diamond hole saw bit dry For smaller-diameter holes this is not an issue, but also there's no real advantage to tilting at the beginning of the cut. If there are clips then the sink usually can be removed by loosening the fasteners, heating up the sealant between the the sink and the granite with a heat gun and with a stiff putty knife, cutting the bond between the granite and the sink. Granite sinks are unique because the sink and the surround are often one piece. When installing granite, though, you may need to drill a hole in the sink for attachments such as plumbing fixtures. We took a piece of matching "pre-fabbed" granite slab (by pre-fabbed we mean the edge has been pre-fabricated), cut the sink hole and polished the entire sink edges. Now identify the area where you want to cut the granite for the sink. The sink should drop out the bottom. All the new cooktop models available (even the 30" size that my old cooktop supposedly is) require the rough opening in the countertop to be about 1/2" to 1" larger on each side than the existing hole in my granite counter. Question by Bittybee8: I need to replace my glass cooktop that broke. It may not seem so ideal when you need to drill a circle into the granite to add a new fixture near your sink … The project was to replace a top mount granite kitchen sink with an undermount granite kitchen sink. I have some granite that is 1.5 inches thick that I want to cut a hole in for a round bathroom sink. Drop in the sink. use jigsaw to cut sink hole Use a spade bit to make a pilot hole in the plywood, and use a jigsaw to cut the sink hole. If you have a stone countertop or a ceramic countertop you will need a special diamond hole saw. Get the sink cutout wrong by ½ inch and the sink is either off-center or it hits the base cabinet when you try and drop it in the hole—or both! Cutting the hole for the faucet. Caveat #2. If you do this then you do not need to worry much about the smooth cut. Now take a paper as a cutout and a scissor. 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