ONC Granite
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Curved work · How it is built

How curved stone is cut: radius, templates and CNC

Curves are possible in stone, but only within limits. Here is what decides whether a curve can be built and kept safe.

A curve in stone starts with an exact template of the room as it was built, not as it was drawn, because a curved piece has to meet walls, cabinets and other pieces along its whole length.

The curve is then cut by a CNC machine that follows the template. The cutting tool has a diameter, which sets the smallest inside radius the machine can make; a corner tighter than the tool allows has to be opened up or finished by hand.

Stone is strong when it is pressed and weak when it is bent or left unsupported in a thin section. Long, narrow or heavily curved pieces can crack during cutting, handling or installation, so we check the width, the support and the weight before we promise a shape.

The edge is finished and polished by hand so the curve has no flat spots. A curved backsplash can follow a curved countertop or bar top, but the pieces have to be planned together.

Questions about your stone?

Send us a photo or the slab name and a person from ONC will answer.

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