A Guide to Angle Grinders

A Guide to Angle Grinders

Powerful, versatile, and effective, angle grinders are a must have in any tradesperson's or serious DIYer’s toolkit. These power tools can cut, grind, sand, and finish, making them a useful addition in a range of scenarios, from home workshops to construction sites.

At ToolStore UK, we’re pleased to offer high quality grinders from trusted brands including DeWalt and Makita, and we’re here to provide you with all the knowledge you need to get the most out of your angle grinder.

What is an angle grinder?

An angle grinder is a power tool designed to cut through and file tough materials such as metal, stone, and concrete. It features a rotating disc that spins at a very high speed to cut, sand, or buff. You can achieve different results depending on the type of disc you use.

When operating an angle grinder, you’ll need to recognise a few key components:

The disc - this is what will rotate and make contact with the material you’re working on.
The safety guard - goes around the disc and shields you from sparks, particles, and accidental contact.
Handle - this is what you hold to use the angle grinder.
Spindle - the shaft attached to the disc. This is what spins to provide the disc rotation.

What is an angle grinder used for?

Angle grinders can be helpful in an array of tasks. The fact that you can swap the discs means you can work with different materials and get different results.

One of the primary purposes of an angle grinder is to cut cleanly through tough materials, including metal, concrete, and tiles.

You can also use it:

To grind away rust and paint
To remove grout or mortar
To smooth surfaces ahead of painting
For rough cutting and shaping of wood

These uses make angle grinders incredibly handy for a variety of projects, from home renovation to construction work.

What materials is an angle grinder best suited to?

We can see that angle grinders are durable enough to work with very hard surfaces. From wood to masonry, let’s look at the types of materials on which you can use this power tool in more depth.

Spoiler alert: It’s all about the discs…

Can I cut wood with an angle grinder?

It’s certainly possible to cut wood with an angle grinder, however, it’s important to make sure you have the right disc type — like the Bosch Carbide Multi Wheels (available in 115mm and 125mm).

Without the proper disc, cutting wood with an angle grinder can be very dangerous. It’s challenging to achieve precise cuts because the discs spin at such a high speed. There’s also the risk of kickback because the blade can get stuck in the woodgrain.

You’re generally better off using a circular saw to ensure clean cuts.

What surfaces can you grind with an angle grinder?

As the name suggests, angle grinders are a top tool choice for grinding. Grinding is where you remove part of a surface layer, leaving a rough finish. You can grind various material surfaces, including metal, stone, and concrete.

In some circumstances, with the right disc, you can also use angle grinders to grind glass, plastic, and rubber.

Can you sand with an angle grinder?

Sanding is similar to grinding, except it results in a medium to smooth finish. You’ll want to use flap discs or sanding attachments, which can help smooth metal, wood, concrete, and tile. You may also be able to sand marble with the correct angle grinder disc.

Can you buff with an angle grinder?

Although angle grinders are known for their robust ability to remove large layers of a surface and cut through resistant materials, they can also be used for more delicate work.

Again, provided you have the right disc or attachment, angle grinders can help you achieve a smooth finish through buffing and polishing. They can work especially well on metal, helping to restore shine.

How to use an angle grinder safely and effectively

Using angle grinders can seem intimidating at first. But once you have the right gear and master the fundamentals, you’ll soon find you can get some great results from these multipurpose tools.

Preparation: Getting the right safety gear

First up, wearing the right PPE is essential. So, what will you need?

Goggles or a face shield will protect your eyes from sparks and flying debris
Ear defenders will help with the loud noise
Gloves are important for protecting your hands against hot sparks and sharp edges
If you’re working with materials that produce dust or harmful fumes, wear a respirator mask. You may also benefit from a dust extractor in your workspace
When working with metal, it’s also wise to wear flame-resistant clothing to keep you safe from sparks
Steel-toe-capped boots are always a good idea when working with power tools, especially if you’re on a construction site

How to attach and change angle grinder discs

The disc you use can completely change the tasks for which your angle grinder can be used, so learning how to efficiently attach and change the discs can help you get the most out of your power tool.

As with other tool types, the exact angle grinder make and model may require a slightly different approach. However, as a general guide, here’s how to attach angle grinder discs.

Unplug your corded angle grinder or remove the battery from your cordless angle grinder
Place your grinder flat on a surface with the disc plate facing up
Press the button at the top of the angle grinder, holding it down to lock the drive spindle. Unscrew the locking nut and remove the inner flange
Install the wheel guard, tightening it with a screwdriver
Replace the inner flange and then add your angle grinder disc on top
Replace the locking nut
Press the button at the top of the angle grinder, holding it down to lock the drive spindle as you tighten the disc using the locking tool that came with your grinder. This should slot over the locking nut
Turn it clockwise to tighten.

Mastering the proper grip and posture

Always hold your angle grinder with two hands — one on the main handle at the back, and one on the side handle. Hold securely but not stiffly.

Stand with your feet shoulder-width apart, and stand slightly to the side of the grinder. If you stand directly behind it, there’s a chance you could experience kickback.

How to use an angle grinder to grind a surface

If you’re grinding, hold the grinder at a 15°-30° angle to the surface, then move the tool smoothly back and forth. Apply gentle, even pressure as you go.

How to use an angle grinder to cut metal

If you’re cutting metal, you’ll need to hold the grinder at a 90° angle to the surface. Once you have your angle grinder in the right position, you’re ready to start cutting. Apply light pressure and move the tool along the cutting line.

Common mistakes to avoid when using angle grinders

As with any power tool, getting the best results from your angle grinder takes a bit of practice. Here are a few common mistakes to avoid so you can soon become an expert.

Using the wrong disc: If you want to buff a surface, using a disc that’s too coarse will remove too much of the top layer, resulting in a rough finish. Ensure you have the correct disc for the surface material and the desired results.
Not checking the grinder for damage before use: It’s essential to visually inspect the grinder for signs of damage before every use. A quick check can help avoid snags and kickbacks.
Failing to clamp the workpiece: The surface you’re working on needs to be stable and secure. If not, you could end up slicing through the wrong area, or the material may fall from the workbench.
Applying too much force: Although a bit of gentle pressure can help guide the tool, excessive force can cause the material or the grinder disc to shatter. It can also cause kickback.
Using on or near flammable materials: Angle grinders often cause hot sparks to fly. You could end up with a fire hazard if you’re not working in a safe area or you try to grind flammable materials.

Expert tips for getting the best results with your angle grinder

So, you know what not to do — now here are some top tips to help you become an angle-grinding pro.

Choose the right disc

There are various angle grinder discs for different jobs. As a whistlestop tour, here are your options and when to use them:

Grinding discs: For removing surface material — they’re available in different grits, so make sure you choose the best abrasion level for your project.
Flap discs: Ideal for sanding, buffing, and finishing — again, these come in different grit options.
Cutting discs: For when you need clean, precise cuts through metal and other materials.
Diamond cutting discs: Heavy-duty discs for cutting through materials like concrete.

You’ll also notice that grinder discs are available in various sizes — ensure you select the correct dimensions for your specific power tool model.

Maintain your angle grinder

Like any power tool, the better care you take of your angle grinder, the longer it will last and the better results you’ll get from it. Care for your grinder by:

Cleaning it after every use
Lubricating any moving parts
Changing the disc when needed
Storing in a cool, dry place
Inspecting it before each use for any damage

Invest in accessories

Along with the right safety gear, it can be wise to kit yourself out with reliable batteries and chargers (if you have a cordless angle grinder). We also suggest stocking up on various discs that are compatible with your angle grinder, so you’ll be able to handle any task as needed.

Take a look at our full range of accessories for inspiration.

Top angle grinder picks at ToolStore UK

We have an excellent collection of angle grinders here at ToolStore UK, and we’ve found that some of the stand-out models are from Makita and DeWalt. Here are some of our top recommendations.

The Makita 9557HNR 240v 115mm 840w Angle Grinder is perfect for medium-duty tasks at home and in professional settings. It’s lightweight and ergonomic, with the ability to grind, cut, and polish a diverse range of materials.
When you need to work with more demanding materials, the best-selling Makita GA5021 110v 125mm 1050w Angle Grinder can handle the job. It has a soft start to ensure smooth control from the outset and is ideal for construction, metalwork, and fabrication tasks.

(Note: This will need to be used in conjunction with a transformer.)
Complete with a carry case and range of accessories, the DeWalt DWE4206KL 110v 115mm 1010w Grinder with Kitbox has everything you need for reliable cutting and grinding in professional settings. The grinder itself is lightweight and features a dust ejection system to protect the motor. You can also benefit from tool-free adjustments.

(Note: This will need to be used in conjunction with a transformer.)

If you’re after a reliable cordless model, the DeWalt DCG405P2 18V XR Brushless 125mm Angle Grinder is a great choice. This grinder is ideal for heavy-duty applications and features a brushless motor for enhanced longevity.

Ready to upgrade your toolkit?

Whether you’re considering an angle grinder for the first time or looking to upgrade your kit, these powerful tools can be incredibly useful. They are versatile and powerful, capable of handling a wide range of tasks and materials.

Here at ToolStore UK, we stock angle grinders from reliable manufacturers, and can highly recommend DeWalt and Makita angle grinders. Take a look at our range and order yours today.

FAQs

Is it worth buying an angle grinder?

Angle grinders have more to them than meets the eye. In addition to cutting through dense materials, they can also offer more specialist applications, such as sanding and buffing. For this reason, they are a great addition to any power tool collection.

Do you need a licence to use an angle grinder?

No, you don’t need a specific licence to use an angle grinder. However, if you are using it for work, you will need to ensure you have adequate training.