Use the mandrel on your drill to create the first hole in the glass.
How to drill hole in glass shower door.
Begin at very low rpm to create a dimple in the glass then remove the cardboard and continue at about 400 rpm.
Double check the speed of the drill.
Drilling a hole in a pane of glass or a mirror is simple.
After a long time you can drill a hole.
Then placing a hard wood behind the glass you must use the stylus very gently tapping with a hammer.
Buffer the area between the glass and the clamp with the rubber.
Tape a small scrap of dense cardboard to the glass.
Clamp the glass down with the c clamps.
Position the glass under the drill or position the drill on the glass where you want to drill.
In this video we drill a hole using a spear shaped glass drill bit.
Then put the saw on the drill and place it into the hole you created with the mandrel.
Place the point of the drill at the center of the marked point on the glass pour a few drops of lubricating oil on the area around the drill tip and glass beginning at low speed with medium pressure drill a small starter hole into the glass.
The key is to use a carbide bit made especially for glass and tile.
But if you can use a steel needle or stylus absolutely thin and spikes you can.
Yes the tempered glass will completely shatter if this is even attempted.
Drill the hole through.
Start on a piece of cardboard.