How to Use a Grinder

how to use a grinder

For those who do a lot of wood, metal or construction work, an angle grinder is an essential tool. You’ll see them in most workshops or building sites where they are used to polish metal or remove excess pieces of material. If you’re new to these types of power tools, you might be wondering how to use a grinder.

In this article, we will be explaining what they are, what they do, as well as the best way to achieve the results you are looking for.

What is an Angle Grinder? 

Angle Grinders are special power tools that have a spinning blade that allows you to grind, cut, or polish hard materials including metal, steel, and tiles. There are lots of different types available, though, depending on your preference and the type of project you are working on. The main differences are found in the size of the disc and how powerful the motor is.

The Bosch 4-1/2-Inch Angle Grinder 1375A.
Find deals for this model and other angle grinders on Amazon now.

However, there are other options when it comes to the power source (which can be electric or pneumatic) and how fast the disc spins (the rpm). Normally, pneumatic powered grinders are better suited to smaller and more precise jobs, whereas electric ones are better for larger projects.

Most tool manufacturers make angle grinders, with the only real differences coming from the amount of power, build quality, cost, and durability.

What can you do with an Angle Grinder?

Angle grinders perform two main functions; they cut and they grind. With cutting, they are best for making straight cuts. Although after gaining more experience with an angle grinder, you can learn to cut curves as well. They are versatile tools, which means they can do a number of jobs, thereby removing the need for having lots of different equipment. Here are some examples of what you’ll be able to do with an angle grinder:

  • Cut tough materials like sheets of steel, rusted bolts, rods, bricks, tiles, slabs.
  • Removing worn mortar.
  • Sharpening edges on blades, spears or axes.
  • Smoothing surfaces by removing paint, debris, and rust.

If you want to grind a concrete surface, click here read our dedicated post and read our expert review of concrete grinders and sanders

How to Use a Grinder Attachment

The reason why angle grinders can perform a variety of tasks is that you can replace the discs with ones that are specifically suited to the required task.

The types of discs available are as follows:

Cut Off Disc

These are available in either a metal or stone version and are used to cut various objects

Diamond Cutting Disc

These discs are diamond tipped on the edges, providing extra toughness so you can cut hard materials like tiles, slate, marble, granite, and asphalt. If you are using one of these, you should familiarise yourself with the way they work, because some materials need to be wet when cutting, while others need to be dry

Abrasive Discs

These replaceable discs are made from sandpaper with an attachment on the rear to keep it mounted on the grinder. They are available in whatever coarseness you need and can be used to smooth down different types of surfaces. Once they wear out they can easily be replaced.

Grinding Discs

These are available in various shapes and sizes, which are designed to work on metal or stone. They are also used to grind the material and turn it into a uniform shape.

Flap Sanding Discs

These are mainly used to sand the surface, but it also has a slight grinding effect. Therefore, it can be a better choice when working with delicate materials or when you need to be particularly precise.

Polishing Pads

These pads are used on delicate surfaces, such as paintwork, for polishing.

Compare discs on Amazon now.

How to Use an Angle Grinder to Cut Metal

With all of this in mind, it’s easy to get started with your angle grinder to cut metal. Of course, the more you practice the better you will get, but even your first attempt shouldn’t be too problematic.

First, you must be aware of the type of metal that you are working with and what you want to do with it. This will determine the type of disc that you need. If you want to cut a length of rebar, for example, you will need to attach a metal cut-off disc to the grinder. Next, attach the piece of rebar firmly within a clamp so there is no risk of it getting free.

Ensure that the place where you will be making the cut is clear from the clamp. Now, you’re ready to cut. Slowly lower the grinder over the rebar and let the weight of the tool do all the work. Be ready to let the free end of the bar drop to the ground without getting in the way.


Angle Grinders are versatile tools that can be used to cut or grind a wide variety of materials in place of more specialized tools. By changing the discs as required, an angle grinder will do a great job in a short time.

This lets you focus on the other elements to your project. It doesn’t take long to learn how to use a grinder, but with practice, you can unlock the full potential of this great tool.

Read more about grinders and sanders in our dedicated section.

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