Drilling Sink Holes in Granite
- 1). Place a piece of duct tape over the area of granite you'll be drilling. Mark the center of the hole with a pen. The tape helps prevent the drill from sliding while also protecting the surrounding granite against scratches.
- 2). Place a hole saw with diamond cutting tips on the end of a drill with a variable-speed trigger. The variable speed helps prevent the drill bit from overheating because you'll drill at a lower speed. The saw needs a pilot bit in the center that you match up to the ink mark on the duct tape. The hole saw should be equal in size to the hole you need.
- 3). Dip the end of the hole saw in cutting oil. This helps prevent overheating. Set the drill at the lowest speed possible, which ideally should be about 100 to 200 rotations per minute.
- 4). Press the center tip of the hole saw against the ink mark on the tape while the bit is still moist with oil. Use minimal pressure initially and press the trigger of the drill to start drilling the sink hole.
- 5). Moisten the tip of the bit and the hole saw every 20 to 30 seconds with more cutting oil to help prevent overheating. Wipe the bit with a rag before continuing to remove debris. Continue drilling until the hole is fully formed in the granite.