How to Drill a Glass Window

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Glass is a brittle material that is difficult to drill cleanly. Standard carbide-tipped bits will chip and crack glass windows, but diamond-tipped glass drilling bits can drill windows cleanly. By pointing a steady stream of water from a garden hose toward the hole being drilled, the bit will remain cool and lubricated, reducing the chance for cracking or chipping the glass.

Things You'll Need

  • Diamond-tipped glass drilling bits
  • Cordless drill
  • 2 2-by-4 boards
  • Garden hose
  • Place the two 2-by-4 boards on a flat, solid surface such as a driveway or sidewalk. Position the glass on top of the boards, with the spot to be drilled close to the edge of one of the boards.

  • Place the tip of the garden hose so that it is pointed directly at the spot where the hole is to be drilled. Turn on the water so that a small but steady stream of water is flowing over the spot to be drilled.

  • Install the diamond-tipped drill bit into a cordless drill. Set the drill's speed to low, and begin drilling the pilot hole at the desired spot. Drill as slowly as possible, applying little pressure to the bit.

  • Increase the drilling speed after the pilot hole begins to take shape. Increase the amount of water from the hose as the drilling speed increases.

  • Drill until the hole is completed. Carefully retract the drill bit from the hole.

Tips & Warnings

  • To avoid the danger of using AC power and water on the same project, use a cordless drill instead of a corded power drill. Also, wear appropriate safety equipment, including safety glasses.

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