How to Drill Holes in a Glass Block Bar

Wall of glass blocks

Glass block can be a very brittle, difficult material to drill cleanly. Carbide-tipped bits can easily chip or crack the glass block, but diamond bits will drill into glass block cleanly. By keeping a fresh supply of water on the tip of the drill bit to reduce heat, you can drill into the glass block rather quickly.

Things You'll Need

• Cordless drill
• Diamond-tipped drill bits
• Water hose

Instructions

1. Place the glass block on stable, level ground (such as yard, sidewalk, driveway), with the side to be drilled pointing upwards.

2. Turn on your water hose and position the tip so that a small trickle of water is pointed toward the location for the hole. The water flow should remain steady throughout the entire drilling process.

3. Insert the diamond-tipped bit into your cordless drill. Set the drill speed to low.

4. Begin drilling the hole at the desired location. Use minimal pressure, allowing the drill bit to do the work.

5. Increase the speed of the bit after the pilot hole has started. Increase the water pressure from the hose to keep the bit cool and lubricated.

6. Drain any water that may have dripped into the block after the hole is completely drilled.

Tips & Warnings

• If you choose to use a corded power drill, use extreme caution to avoid contact with the water from the water hose. Also, be sure to wear safety glasses when drilling glass block.

References

• How to drill a hole in glass
• Drilling holes in glass block
• Glass Block Lights