How to put a hole in a 3" glass float?

I have a bunch of 3" glass fishing net floats and I want to put a 1/2" hole in them to put LEDs in them to make them lights.  Any ideas on how to do it without destroying the float would be appreciated?
I have attached a picture of what they look like.
Thanks for any help

Picture of How to put a hole in a 3
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you need a special drill bit like this and drill at low speed withou much strenght, otherwise the glass can crack and broke. Take as long as you need.
In my classroom two pals drilled glass. One toke 1 hour to drill a bottle. The hole got smooth. The other toke 5 minutes. The bottle got cracke and the hole square. So, take it slow.
frollard4 years ago

I've used a product like this (from any home improvement store) with GREAT ease to cut various holes in glass. Cuts the glass like butter, and leaves a nice straight edge. A little wet sandpaper (while wearing gloves) takes care of any sharp edges.

The exact ones I used looked more like
iceng frollard4 years ago
This image
makes more sense as you would not need a removal bit gap in glass :)
I'm gonna try these on rocks.

Re-design4 years ago
Which ever method you use you should wear gloves and EYE PROTECTION. These glass floats already have odd stresses in them and when cut may release those stresses and break throwing off chips. Cutting under water as mentioned by Burf will help greatly.
rhargesheimer (author) 4 years ago
Thanks all. I'll report back and let you know how it turns out.
Burf4 years ago
Use a 1/2" diamond plated hole saw. It will cost you $15 to $20 U.S. in most hardware stores.
Chuck the bit into a BATTERY POWERED drill and hold the glass under a slow but steady stream of water and slowly drill the hole where needed. Don't apply any more pressure to the drill bit than needed to lightly abrade away the glass. The break-through point, where the bit finally cuts through the glass, is the most precarious, where most breakage occurs.
Practice a few times on some old bottles to get a feel for the process. And, expect to break a few no matter how carefully you work.
rickharris Burf4 years ago
canucksgirl4 years ago
You can buy hole cutting saw blades for glass. Just pick the right diameter and steady the glass float in a padded vice (just enough that it won't move around), and carefully make your hole.

I've seen holes cut into bottles this way (which worked fine), but I don't think there's any process that can ensure you won't break a few of the floats.