Using Grinder Bit To Make Holes

Drilling holes in glass can be a bit frightening to start with. Once you get the hang of it, you’ll be able to hang suncatchers and fused pieces up without unsightly hooks.

You don’t need lots of expensive equipment.

  • If you already have a grinder you can simply add an extra drilling bit for it and get going for a few bucks.
  • If you’re interested in engraving your stained glasswork, or want smaller holes for hanging your panels invisibly, then either a Dremel or a flexible drill is for you.

The most crucial thing to remember when learning about drilling holes safely and without breakage is that you need water. It acts as a coolant and stops the glass from over-heating and cracking.

Drilling Holes In Glass With A Grinder

  • Wear goggles to protect your eyes.
  • The cooling water is provided via a wet sponge that you keep under the glass.
  • Introduce your stained glass slowly over the top of the drill bit at an angle to start with, and then slowly straighten it up so that it’s flat on top of the drilling bit.
  • Don’t press too hard otherwise it will break. The diamond will do the work.
  • Just before the drilling bit comes through the top, reduce the pressure a bit so that it doesn’t chip the stained glass.

Here’s a helpful 52-second video of drilling holes in stained glass :

Video showing how to drill a hole in stained glass with a grinder

Grinder Drill Bit Suppliers

This is the cheapest option for drilling holes in stained or fused glass. You can buy drilling bits that fit on your grinder head, either 1/8″, ¼” or 3/8″ in diameter.

Most manufacturers supply diamond drilling bits for their grinders, so you should be able to find suitable drill bits.

You may have to buy an adapter too, depending on the make of your grinder. It can stay fixed on top of your day-to-day grinding drum, making it ready and easy to use whenever you want to drill a hole.

Amazon sell all these types of products. All you need to do is screw the Inland Bit Adapter on top of your grinding drum, and then screw the diamond drilling bit into that.

How To Make Holes With A Drill

Water is the key to safety and success, and with a drill you have to keep the stained glass cool by putting it in water as you do the drilling.

  • Put on an apron and goggles.
  • Put the glass in a shallow container. I use a plastic photographic tray, but ice cream tubs will do.
  • Put a bit of newspaper or polystyrene at the bottom to stop you drilling a hole through the container.
  • Cover the stained glass and paper with about ¼” (6.5mm) water.
  • If you can’t find a tray big enough, simply dab water on with your left hand throughout the drilling/engraving process so that it doesn’t get hot and break.

Here’s a very helpful 2 minute video showing how to drill a hole in stained glass with a flexible shaft drill by my friends at Warm Glass, Bristol UK.

Drilling a hole in stained glass with a Dremel with a flexible drive

– Turn the drill on. The fastest speed is best for drilling holes.

– Holding the hand piece like a pen, introduce the drilling bit to the glass slowly, from the side to start with to make a small dip to prevent slipping and scratching.

– Once the hole is started hold the drilling bit vertically and let the diamond burr eat into the glass with a little bit of pressure.

– Gently move up and down, so that water can get into the hole.

– Don’t push hard or you’ll break it; let the diamonds do the work.

– When nearly through to the other side reduce the pressure even more so that you don’t chip around the hole.

Types Of Drills Available

Flexible Drive Drill

rotary shaft tool

This type of drill is very similar your dentist’s drill, with a moveable ‘arm’ and a hand piece that holds the diamond drill bit.

These drills are the most flexible of the drills available as it doubles up as an engraving tool.

The speed is adjustable with a foot pedal. Go fast for holes, slower for engraving.


– They’re small, inexpensive and excellent for drilling smaller holes. This is great if you want to hang your glass work up invisibly with thin wire or fishing wire , or bolt a small shape of glass on to a base glass.

– These drills are also fantastic for engraving pictures or text on to the surface of the glass. You could use it for copying your children’s drawings or your favourite poem on to your stained glasswork.

Stained Glass Drill Suppliers

The best quality and value drill with a flexible ‘arm’ option is the Dremel 4000. (affiliate) This set up – drill with a flexible shaft – really gives you the freedom to sign your name, copy drawings or make other marks on your glass really easily.  I have a video showing you how to sign your name on glass here.

engraving children'spictures

The flexible shaft that connects to this Dremel can be found on Amazon here. (affiliate)

It’s been rated 4.5 out of 5 stars by Amazon reviewers, who say it’s a “good quality tool” and “great value”.

Of course Dremels are very good drills for all sorts of craft work, not just stained glass.

You need decent drilling bits, the cheap ones go blunt too quickly and end up being a false economy. You can get diamond bits from dental suppliers.

You can get packets of six diamond drill bits but if you really want the best, you need the impregnated diamond coated bits – sintered –  which cost more. I get mine from a specialist drill supplier and they last for ages.

blue stained glass with drilled holes and bolts
Stained glass with holes and bolts

So that’s it, simple! Hopefully you’ll have a really good idea now about drilling stained glass, and the equipment that you need to do it.

If you don’t already own a grinder, there’s a page of grinder reviews of the best available here.

Tech Talk – Drilling Glass

You can buy diamond drill bits with three different types of diamond coating, ranging from single layer (cheaper and not so durable) to impregnated (longer lasting but more expensive). The diamond drill bits come in sizes from 1/16″- 2″ (3-50mm) – the bigger the bit the slower the recommended rpm. To give you a rough guide; drill bits up to ½” (13mm) can be used at speeds from 3500-4000rpm, for ½”-1″ (13-25mm) bits go at 2000rpm, slow down to 1000rpm for drill bits between 1″-2″ (25-50mm) FrancesStained Glass TutorialsGrinding and Drilling Tools,IntermediateUsing Grinder Bit To Make Holes Drilling holes in glass can be a bit frightening to start with. Once you get the hang of it, you'll be able to hang suncatchers and fused pieces up without unsightly hooks. You don't need lots of expensive equipment. If you already have a grinder...Create beautiful things. I'll show you how.
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