it’s not that tough. You need water and good quality diamond burs.
I use a tuna can about half-way filled with water. Mark on the glass
exactly where you want to drill (sharpie works well).
If you’re drilling all the way through, you should mark both sides
of the stone (use calipers to figure out the exact opposite side of
the piece of glass).
Start with a round diamond bur several sizes smaller than the hole
you want to drill. Work from the front of the glass. Drill slowly to
get started and “pulse” the bur up and down gently so that the water
in the can washes out the hole continuously. Stop periodically to
wash out the hole (a q-tip with water is a good way to do this).
Drill from the front about 2/3 - 3/4 of the way through.
Turn the piece of glass over and drill from the back through to meet
the hole in the front. This avoids “blowout” where the back can’t
take the pressure and fractures much larger than you want.
Once the small hole is all the way through, you can enlarge it by
using diamond cylinder burs to progressively move up in size a bit at
a time until you reach the size you want. With the hole drilled
through you no longer need to pulse because the water will be
continuously washing the grit away. However, you should still be
working fairly slowly (bit rotation) to preserve your bits and avoid
fracturing the glass.
Hope this helps!
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