How to CUT GLASS with a Dremel?

dremel glass cutting tool

Want to turn a bottle into a drinking glass, vase or candle holder? The best and quickest way to cut glass is with a Dremel rotary tool.

Indeed, whatever your reason for cutting glass, there is a tool that can certainly help you. The Dremel rotary tools comes with a variety of useful accessories that will help you meet all your glass cutting needs. The trick is to choose the right Dremel bit for the job.

If you want to cut glass with a Dremel, all you need is the right Dremel bit. There are several Dremel bits for cutting glass, and which one you should choose depends on the type of cut you plan to make. Place tape against the glass, draw the outline, run the piece under water and cut!

In this article, we will show you the steps to follow to cut your glass with a Dremel. This way, you will not run the risk of breaking it and you will be able to complete your project.

Safety first!

Precautions to take when cutting glass

It is essential to consider your safety when cutting glass, no matter what the circumstances. This is especially true when cutting glass with a high-powered manual rotary tool.

To cut glass, the bit on a Dremel tool must spin very fast - usually between 10,000 and 35,000 rpm, depending on the speed setting you select. As the bit cuts the glass, glass splinters and dust escape at high speed from the cutting areain the direction of rotation of the Dremel drill bit.

Precautions to take :

  • Be sure to wear safety glasses when cutting glass.
  • Wear a dust mask.
  • Pay attention to the direction in which the glass cutting bit rotates.
  • Wear gloves to protect your hands in case of breakage.
  • Keep your work area free of debris.
  • Fix the glass before cutting it.
how to cut glass dremel

Setting up your Dremel for glass cutting

To prepare your Dremel for cutting glass, you need to insert the right bit. There are bits designed to cut a wide variety of materials. However, Glass bits are the easiest to use and give the best results.

Inserting the tip is a simple task. Simply insert the glass cutting bit into the Dremel. Once inserted, tighten the collet to secure the bit in place. The choice of bit depends on the type of work to be done.

Common Dremel bits for glass cutting

If you are cutting a straight line, a tip like the "545" diamond disc is a perfect choice. The 545 diamond disc has a thickness of 0.6 mm and a diameter of 22.2 mm. It is fully coated with diamond dust, making it perfectly suited for cutting glass.

The 663DR 1/4″ Glass Drill Bit is an ideal choice for drilling holes in glass of all types. It is also available in a variety of sizes. You can choose either the 1/4 in size or the 1/8 size depending on the size of the hole you want to drill.

For engraving work, a Dremel bit such as the Dremel Fiber Bit is the best choice. The diamond particles that coat the engraving surface make this bit ideal for engraving hard surfaces.

How to cut glass with a Dremel

The method of cutting glass with a Dremel varies slightly depending on the cut you are looking for.

If you use a Dremel cutting discThe method will be very similar to cutting PVC pipe. The disc rotates at a high speed and you must guide it along the line you wish to cut. It is essential to hold the tool very firmly while cutting.

When using a drill bitThe method will be similar to that of a standard drill bit. However, the same heat management and safety precautions that apply to cutting straight lines also apply to drilling holes.

Step 1: Tape the glass

Put masking tape along the line you want to cut. Whether it's cutting a bottle in half, reshaping a mirror or anything else, make sure the tape provides a good line guide for you to follow. Masking tape is ideal for this purpose because it adheres perfectly to the glass and does not leave a sticky residue when you remove it.

Step 2: Draw the lines

Use a marker to draw a line on the tape, indicating where you will make your cutout. Be sure to use a waterproof marker for this step, as there will be water in the next step. It is also advisable to let the ink dry completely.

Permanent markers are perfect for this step because they do not fade under water and they dry relatively quickly.

Step 3: Run the glass under water

Place the glass under a small stream of water and slowly begin to make your cut. The water helps to keep the temperature low during the cutting process. Water also makes cutting smoother and faster.

If you use a Dremel It is essential that you hold the Dremel tool at an angle that does not allow water to drip onto the wire.

Step 4: Sanding

Once you've made your cut, a rough edge will remain on the glass which will probably be very sharp in some places. Use a diamond file, an 80 grit sandpaper bit or a piece of 80 grit sandpaper (wear gloves!) to smooth out the cut edges on the glass.

When sanding or filing, be careful not to press too hard. If you press the file too hard, you may crack the glass or even break it.

It can happen that your glass object breaks

During all these steps, it is important that you are as gentle as possible. The vibrations of the Dremel can affect the glass, which is why it is advisable to wrap the area with tape.
In addition, keeping the glass at a certain temperature also reduces the risk of breakage. For example, never try to use the Dremel on cold glassbecause it would be even more fragile.
Also, don't press too hard. If you make a hole and the Dremel catches on a shard of glass, the rest of the glass may crack. That's why it's important to take it slow.
glass cutter dremel

How to cut a glass bottle with a Dremel?

Wine bottles are great for decorative projects. They are sturdy pieces of glass that can be used for everything from candle holders and glasses to planters and lamps.

But "How do you cut a bottle of wine in half?" and the answer is simple: with a Dremel tool of course.

To show you the process, we will guide you step by step to easily cut the bottom of glass wine bottles with a Dremel tool.

You will need the following equipment:

  • Safety glasses
  • Safety Mask
  • Dremel rotary tool
  • Diamond cutting disc
  • Sanding device

You will also need the following materials:

  • Glass wine bottle
  • WD 40
  • Adhesive tape
  • Sandpaper (for glass)

Guide to cutting a glass wine bottle with a Dremel tool


Mark your cutting line

When cutting glass bottles with a Dremel, it can be difficult to keep a straight line unless you mark it beforehand.

Wrap the wine bottle with tape to create the cut line.

Tip: Tape is better than ink for drawing a cut line when cutting glass bottles with a Dremel tool.

The WD-40 used to lubricate the glass during the cutting process can erase the lines drawn with a marker.


Make the first notch

Before cutting around the entire circumference of the glass wine bottle with a Dremel tool, it is best to first make a small notch. This notch will be your starting point when you carefully cut all the way around the bottle.

First, put on your mask and safety glasses.

Place the bottle on a stable work surface that will not move while the Dremel tool - and its very sharp blade - is in motion.

Spray with WD-40 at the point on the glass where you will make your cut. This will lubricate the Dremel tool as it cuts the wine bottle in half and keep it from cracking!"

Info: By lubricating the bottle, you prevent the Dremel disc from heating up when cutting the glass wine bottle, which could cause the glass to shatter.

Using the edge of your tape line as a guide, slowly push the diamond disc into the glass until you have gone all the way through.


Cut the rest of the bottle

Carefully extend your first notch with the Dremel's diamond disc until the glass bottle is completely cut in half (or as needed for your particular DIY project).

Continue to apply WD-40 to the glass, working your way around the bottle. Never touch the cutting disc in an area that has not been lubricated beforehand.

Warning: Due to the nature of the glass wine bottle, it can be difficult to hold it in place while cutting. To be safe, always hold the bottle by the end furthest from where you are cutting.

While working, tilt the bottle and the Dremel tool away from you in case the cutting wheel slips.


Sand your glass bottle with the Dremel

Now that you know how to cut a glass wine bottle in half with a Dremel tool, it's time to learn the finishing techniques.

At this point, the glass will be rough and sharp, and therefore dangerous, especially if you use the cut half of the wine bottle as a drinking glass.

Change the tip of your Dremel to a sanding/grinding attachment and add WD-40 to the cut edges of the glass to lubricate them.

Run the sanding attachment over the cut edges of the glass bottle until they are smooth and even, adding lubricant if necessary.


Sand your wine bottle by hand

Use a high-grit sandpaper suitable for use on glass, and thoroughly wet the sandpaper with water. Sand along the cut edges of the wine bottle until they are smooth.

All you have to do is wash the bottle and wipe off any remaining oil or glass dust, and you're done!

YouTube video

Cutting glass with a Dremel: Frequently asked questions


Up to 3 quotes in 5 minutes.
Click here


Experienced handyman, I had the pleasure to build myself my last 2 houses. But my real passion is to create, modify or give life to all the objects that decorate my home. That's why I'm sharing my experience with the intensive use of Dremel tools. They are indispensable to me and I use them every day 😀

DIY Tools Buying Guide