Drilling a Hole in the Side of a Glass Bowl
- 1). Mark the site of the future hole. Make a small dam using modeling clay on a flat surface. The dam should be 1-inch larger in diameter than the size of the planned drilled hole, and 1/2-inch high. Place the dam on the glass bowl. Push down on the clay to secure in place. Fill another small bowl with water.
- 2). Place the glass bowl sideways on a flat surface, such as a work bench or table, with the site of the future hole placing up; keep it secure by placing your non-dominant hand inside the bowl and holding it down against the table.
- 3). Fill the dam with your dominant hand. Enough water should be poured into the dam to lubricate the drill without spilling, approximately 3/8 inches. Then take your handheld cordless drill, with the diamond bit inserted, and place the bit on the site you marked for the hole.
- 4). Start drilling slowly at 700 to 800 RPM. Faster drilling speeds cause the drill to become hot, which may chip or crack the glass as a result. If the drill bit changes colors, slow the bit down even more.
- 5). Raise the drill several times while drilling to let water move back over the drilling site. Ease up on the pressure of the drill when you are almost through the glass. Applying too much pressure when the drill bit leaves the glass may cause chipping and cracking.
Source...