How to Use an Angle Grinder for Grinding and Cutting and Cleaning Metal and Stone

Use an angle grinder and choose the right disc for your DIY job

Advice on using an angle grinder for a variety of tasks, including cutting, grinding and polishing stone or metal. You will also learn how to choose the right angle grinder for your cutting, grinding or sanding work, as well as the various accessories and discs available for angle grinders, such as cutting discs, grinding discs, polishing discs, flip discs and wire brush knot cups For cleaning rust. We will also tell you how to stay safe when using an angle grinder, including clothing and safety equipment you should wear.

An angle grinder (sometimes also referred to as a side grinder or disc cutter) is a hand-held power tool that can be used for a variety of different jobs, including sanding, cutting, grinding, cleaning, and polishing surfaces to make them Have it in your arsenal.

Although almost every major manufacturer manufactures and sells its own brand of angle grinders, they are essentially the same and have similar main features in essence, but the real difference lies in the quality of the tool and the power of the motor as a whole.

You can buy an angle grinder for less than £ 10, but as the saying goes, you paid for it. The build quality will not be that good, and the motor may lack power, but if it is used only occasionally to sharpen the mower blade, then the cheaper model will be more than enough.

However, if you expect it to be used longer or daily, then a more expensive, more powerful, and more reliable model may be the way to go, because you are almost certain that it won’t let you go halfway.

What are the different types of grinders?

When choosing an angle grinder to buy, the most important factors are the depth or size of the material to be cut or ground and the type of material to be used. This, in turn, will guide you in choosing the disc size and type you need.

Generally, most manufacturers produce grinding machines and wheels in the following sizes:

  • 115 mm-4 1/2 inches
  • 125mm-5 inches
  • 150mm-6 inches
  • 180mm-7 inches
  • 230 mm-9 inches

Binic produces grinding wheels among them in the following sizes:

Size(mm) Size(inches) Shape Specification Application Speed R.P.M.
115*6.0*22.23 4 1/2 T27 AS24 R-BF SS/S 80m/s 13300
125*6.0*22.23 5 T27 AS24 R-BF SS/S 80m/s 12200
180*6.0*22.23 7 T27 AS24 R-BF SS/S 80m/s 8600
230*6.0*22.23 8 T27 AS24 R-BF SS/S 80m/s 6600

The most common disc size used for DIY needs (and usually in most areas of use) is a 115mm cutting disc (115mm is the disc size). No matter what type of disc you use, such as cut, smooth, sanding discs, etc., you can get them in 115mm (4 1/2 inch) variety.

They are also often the cheapest due to the fact that smaller 115mm discs (regardless of type, such as cutting, grinding, sanding, polishing, etc.) are the most common and easily available.

As far as size is concerned, angle grinders are available for small, general and light use (up to 7 inches or 180mm) and large (12 inches or 300mm), smaller tools suitable for things like sharpening blades, cutting rebar or cleaning rust.

For larger jobs, such as cutting large diameter steel pipes, I-beams or large paving slabs, larger 300mm cutting discs are more suitable. They are essentially the same, but larger. They should also have the same functions as the smaller counterparts.

Due to their size and weight, they are more complex to handle and manage than smaller equipment. Although they tend to run at slower speeds, they generate a lot of torque.

Binic produces large cut off wheels in the following sizes:

Size Specification Speed
300 x 2.5 x 25.4 A30Q-BF 80m/s
350 x 3.0 x 25.4 A30Q-BF 80m/s
400 x 3.5 x 25.4 A30Q-BF 80m/s

Smaller angle grinders usually run at faster speeds, upwards and in excess of 10,000 rpm, while larger angle grinders usually rotate at 6000-6500 rpm. Generally, with the increase of speed, the wear of optical discs is getting faster and faster, but since the price of 115mm optical discs is relatively cheap, this is not a problem to consider when determining the size of the grinder to be purchased. This decision is really Misses the type of work you are about to accomplish.

Now that we know more about angle grinders, it’s a good time to look at the various sources of power for the grinder. Usually, this will come from one of the following:

  • Electrical: By far the most common type is that it can be powered from mains (230 volts, general and home), 110 volt step-down transformers (mainly for professional and construction site use), or cordless via on-board rechargeable batteries. (The most common is an 18-volt lithium-ion battery). Power or transformer-driven grinders typically have a power range of 500-2,000 gigawatts, while lower wattages are smaller products
  • Gasoline: Gasoline cutting machines are more suitable for on-site use. In fact, they are large angle grinders for cutting steel, bricks, paving slabs, etc. Therefore, it is not really suitable for grinding, just cutting. The tool has a small gasoline engine that drives the cutting disc
  • Pneumatic or compressed air: As mentioned above, this power source is mainly used in professional applications, such as mechanical garages and workshops. The air that drives the tool is generated by a compressor and then guided through the pipe to the tool itself, which then drives the cutting or grinding disc. These tools usually run slower than electric cousins

In summary, if you want to use an angle grinder for general DIY use at home, then the cheaper 115mm wired model should be sufficient for your needs, but if you want to use it in a more conventional, heavier environment On a more powerful basis, more expensive models may be better for you, or even better for larger 300 mm grinders.

What can an angle grinder do?

This power tool is primarily designed for cutting materials or grinding. In terms of cutting, they are mainly suitable only for straight cutting, but can be used for curves if you have more experience.

As mentioned earlier, the real benefit of having one of these tools is its versatility and ability to use a variety of discs and brushes for a variety of different jobs.

In essence, grinders can be used:

  • Cutting of steel plates, bars or rods, rusted bolts and screws
  • Cut bricks, bricks, tiles, floors, and even cut old mortar from the seams
  • Sharpen blades such as moving knives, scissors, shafts and other shredding tools
  • Clean debris, paint and rust from metal surfaces (such as doors and fences, car parts, trowels and shovels, cement mixers, finishing welds, etc.).
  • If you need to cut out apart from the center of a tile or slab, you can also use them to cut into the tile
  • After a lot of practice, they can also be used to shape objects and materials

As you can see, what kind of trade you can do on weekends or as a hobby, the angle grinder is an essential tool and you will definitely use it often.

After doing some exercises with the tool, you will begin to get used to how and how it works, and you may find other uses for it.

With some exercises, you can even cut the curves and shapes of bricks, tiles or slabs. If you are particularly convenient, you may find that you can do this with one click, but this usually takes several steps.

For example, to cut a curve on a terrace slab, you first need to mark the curve you want to cut on the slab, then use a series of straight lines to cut, and remove excess areas along the curve along the cutting blade. When you’re done, you should have a rough shape, and then you can continue shaping until you get a nice smooth curve.

Grinding disc types and accessories for angle grinders

Cutting discs are created specifically for cutting, grinding, sanding, polishing or sanding. Do not attempt to cut or grind with a grinding wheel.

Each disc should be marked as “Stone” or “Metal“.

Stone Cutting discs

Stone Cut Off Wheel

Metal Cutting discs

Metal Cut Off Wheel

Use only discs with discs marked with the material to cut or grind the material.

Stone cutting blades actually cut metal, but they can easily tear and break during the cut-in process, so flying debris can cause great harm and damage to yourself, those around you, and anyone nearby

With the above in mind, you should always grind and cut with the open part of the blade facing away from you.

One thing that may come to your attention when looking at an angle grinder is that the protective cover covers about half of the disc when it is inserted. The shield is adjustable and you can adjust it just by loosening it slightly so that the shield will be between you and the disc no matter where you are using the grinder.

Therefore, never use a grinder without a protective cover, for a reason!

Now that we have determined that you should not use any discs or accessories to cut or grind unwanted materials, and we should always use a protective cover, it is time to look at the various accessories available:

Cut off the discs (metal and stone): these can really be done as said on tin. Metal cutting blades for cutting metal objects, stone cutting blades for cutting stones or bricks

115 mm metal cutting blades – available in our online store

Metal Cut Off Wheel


  • Fast cutting the wheels even for metal cutting.
  • Relatively smooth cutting experience.
  • Applicable to DIY market

115 mm stone cutting blades – available in our online store

Stone Cut Off Wheel


  • Stone cutting disc for angle grinder.
  • Fast cutting for various materials with Minimum friction and low-calorie output, to reduce the pollution of the material.
  • With excellent cutting performance and super-long service life for the application.

Diamond cutting discs (tiles, mortar rakes, slate, marble, granite, abrasive, asphalt): again, they do describe themselves. This type of disc is usually set with diamonds on its edges, so it can handle the cutting of hard materials as described above. When buying these types of discs, you need to check whether they are wet-cut or dry-cut (wet-cuts need to be kept wet while cutting, and can be used with dry grinding without water)

BSP tools manufacture provide sintered blades (cold pressed), mostly used in angle grinders for DIY market, which is divided into the premier, standard and economic. That can be applied: construction materials,  brickwork, concrete, reinforced concrete, natural stone. for use on electric circular saw and angle grinder.


Abrasive Discs/Pads and Sanding Discs/Pads: they usually come in replacement form, basically just a piece of sandpaper, but the difference is that they are usually Velcro backings or have attachment methods so they can be fixed to Pad or base, then connect it to a grinder or sander. From 40 grit to 400 grit, there are various “grit” grades (measurement of the advancement of the paper) available. After the paper runs out, you can pull it out and replace it with a new one

Abrasive Discs/Pads– Available in Our Online Store

fiber disc-abrasive tool

BINIC Fibre Disc is a versatile and general purpose metalworking disc, designed to help with a variety of applications from grinding, weld removal & finishing to blending on common metals like carbon steel.


Grinding discs (metal and stone): two types of grinding discs for metal and stone (make sure to use the correct grinding disc) for grinding metal or stone to shape or remove lumps or peaks

115mm Metal Grinding Discs – Available in Our Online Store

Metal Cut Off Wheel


Product advantages:

  • 115mm Metal Grinding Discs can be used to cut various types of bars and causes no pollution or damage.
  • It prevents the products from clogging pores, thus slowing the grinding process or failing to grind at all.
  • It maximizes the friction to improve sharpness, making it more cost-effective than alloy blades.
  • It is equipped with smooth and flexible handles to grind various steel shapes.
  • It accelerates the process of grinding and avoids air hole blocking in the process of grinding.
  • The type of 6.0mm thickness is widely used for various grinding, causing much less dust.

115mm Stone Grinding Discs – Available in Our Online Store

Stone Cut Off Wheel

Product advantages:

  • Fast cutting the wheels even for different material’s grinding.
  • Relatively smooth grinding experience.
  • Applicable to DIY market

Wire brushes and kink cups: These are basically wire brushes for grinders. Twist multiple sets of wires and place them around the cup, then screw them to the grinder. When tightening, be sure to tighten it.
You need to press the disc lock button to lock any rotation, and then use a wrench to tighten the nut on the top of the lid.

The twisting action of the wire makes it very tough, allowing you to easily remove paint and rust. This accessory shreds most surface coverings, so use it only if you want to completely remove the covering

Wire brush cups and kinks for angle grinders – available online here

Cup Wheel Brush


  • The brushes are ideally suited for use on stationary machines, angle grinder, pneumatic grinders and electric tools.
  • We supply them with a threaded or plain arbor hole to suit your machines.

Flap discs: If you have a grinder, these sanding are very convenient. Although mainly used for sanding and cleaning surfaces (mainly metals), they also sand some, so if you need some fine grinding, they are the best solution because they are not as harsh as a proper grinding disc. They also offer a variety of grit types, so by combining rough particles with smooth particles, you get excellent finish.

115mm Metal Grinding Flap Discs – Available in Our Online Store

Aluminium Oxide – Metal Grinding


  • Mild steel, tool steels, plastic, primer, lacquers and wood.
  • Cleaning of welding seams, deburring, chamfer, De-rust, preparatory works for lacquer of car-bodies, machines, swich boards, tank constructions, sanding of wooden surface such as parquet for furniture

115mm Stone Grinding Flap Discs – Available in Our Online Store

Silicon Carbide – Stone Grinding


  • For working on concrete, stone, tiles, ceramics, non-ferrous metals.
  • Used on marble, granite, stone, and concrete.

Polishing pads: As above, screw them to the threaded part of the grinder and tighten with a wrench. The polishing head or cover can then be secured to the pad. Again, these are replaceable. This type of pad and cover is mainly used for polishing and finishing harder surfaces. Well-known polishers or mops can also be used to polish paint and other fine surfaces. When working on delicate surfaces, it is sometimes better to use larger 230 mm grinders because they run at lower speeds

The quality of discs and accessories varies widely, and the best indicator is usually price. Cheap discs (grinding and cutting discs) wear much faster than expensive discs, but they are cheaper, so this may be balanced depending on how often you use them.

Different parts of the angle grinder

Regardless of the manufacturer, almost all angle grinders will have the same basic characteristics.

  • Most models sold have a basic on / off button slide switch, so the disc will power up immediately. This should be followed and the power tool should be held firmly when the power is on.
  • Regarding switches, most manufacturers configure them so that you have to hold your finger to make the tool work. The second you release your finger, the power to the tool will be cut off. This is mainly for safety reasons, and if anything happens, you will most likely release your finger first.
  • As with all power tools, eye and hand protection should always be worn. Even with the protective cover in place, there are a lot of debris and sparks when using this power tool to machine metal.
  • All grinders are equipped with guards to protect the user from debris thrown by the disc, which is usually transported away from the user. The shield can be moved to allow use in awkward work positions.
  • The grinder lock nut will always be tightened in a direction that does not allow movement. As we already mentioned, the grinder also has a disc lock button that can be used to lock the rotation of the wheel when you undo and tighten a new disc or accessory.
  • Most also come with a removable side handle. In most cases, this can be fixed for left and right hand use, and sometimes it can be fixed on top of the tool, which means that it can be completely controlled no matter where it is used.


angle-grinder-parts-and-attachments (1)

The main components of the angle grinder and some of the available accessories-Note: The disc protector has been removed from the grinder for easy viewing only! Never use it with the protective cover removed

The last thing to mention about the grinder itself is the motor brush. The brush is located on the outside of the motor and makes it work.

Essentially, you need to connect the motor coils to form a complete circuit. To do this, you need to use a spring to fix the brush on the spring and a copper or brass slip ring (or well-known communicator) on the spring shaft. A piece of copper wire on the ring to conduct and supply current.

The brush itself wears out to such an extent that the tool stops working. At this point you will need to replace them.

How to use an angle grinder

How you use the grinder will depend on the grinder you need to use:

  • Cutting or sanding (generally): This applies to metal and stone – ensuring that the item to be processed is firmly clamped to a solid surface. In order to secure the project in place, ideally you need to use a vise fixed on the workbench, workbench or a suitable fixture to secure the project firmly on the workbench or on a solid workbench.
  • Cutting paving slabs: Due to the size and weight of most paving slabs, it is best to do it outdoors or in a garage or in an area with sufficient space. Before you start cutting and grinding, place the slab on a suitable sand bed. This prevents the plate from cracking due to vibrations generated during the cutting process.
  • Cutting tiles: This is a very tricky job and can only be done if you need to cut a part from the center of the tile. Place a thick piece of cardboard under the tile to prevent it from cracking due to vibrations, and use a clip (make sure it has a pad for the clamping part) to gently clamp the tile to the work surface. Too tight, it will crack, loosen, and possibly fall to the floor. This is a good line between too much pressure and too little pressure, so this is probably what you are trying
  • Sharpening the blade: It is best to use a vise or Workmate, as this will allow you to hold the blade firmly in the upward direction, so that you can clearly see the angle required to fix the wheel on the surface to give you the correct cutting blade
  • Cleaning and sanding: It depends on what you are dealing with. As mentioned above, if it is small enough, make sure it is firmly fixed in a vise or clamp, but if you are dealing with large items such as doors or fences, make sure it is placed on the floor. If needed, you can use bricks or some solid wood to support it on the floor

The main point here is that the project you are working on is retained while you are working on the project.

It is not good to try to hold the item with one hand and use the grinder with the other hand, and even ask a friend or family member to hold it for you, because the angle grinder generates considerable torque and it is easy to “bite “Or” slide “and shoot, causing countless injuries to opponents and other parts of the body, so please pay attention to safety and operate correctly!

With the item properly secured so that it cannot be moved, install the correct disc or accessory for the job and make sure it is securely fixed to the grinder.

Before you start cutting, sanding or grinding (without actually running the tool), practice your items a few times so that you know exactly how you need to hold the grinder and where you want to place the grinder. Addresses the need to make tools more manageable.

After practicing, you can really start. Start the tool and start, and gently move it over the desired surface or mark. Don’t try to “level everything” and stop every 10 to 20 seconds to make sure you work in the right area or follow the markings.

Let the tool do the work for you, if you don’t need to put too much pressure on it.

When finished, turn off the grinder and let the disc run down until it stops. Do not drop the disc while it is still spinning, as this may cause damage. Also, allow the item to cool down (especially when it is metal). Grinding, sanding and cutting can cause the object you are working on to heat up, and in most cases, until the object turns red, so don’t burn yourself.

Check your work to make sure everything is fine and you are happy. If you need to do something else, go ahead, but check your progress regularly because once you remove or cut it, you cannot reinstall or rejoin it together.

How to stay safe when using an angle grinder

As we have emphasized many times in this project, these tools, while useful and versatile, are also very dangerous, so please respect them. To ensure safety and ensure successful work, when using an angle grinder, make sure to observe the following:

  • Clothes: Wearing old clothes can be cumbersome, and make sure there are no tassels or loose items. When the grinder is running at high speed, loose objects can easily become entangled and pull the tool into your body, causing serious injury
  • Safety gear: Always wear goggles, ear protectors, sturdy gloves and proper foot wear, such as a pair of heavy boots or even better steel toe caps
  • Protect the things you’re working on: Make sure any items are securely fastened to a decent workbench. If this is not the case, the torque generated by the grinder will launch it into the distance
  • Work in space: give yourself plenty of space to work safely, so you can move tools without pinching anything, and also make sure you don’t get stuck
  • Exercise: Regardless of whether the power tool is running, get used to its feel and weight. Gyro forces from spinning discs or attachments can be a little weird, so it’s worth getting used to
  • Grind and cut yourself: Always grind and cut yourself off, and make sure the guards remove any debris from you
  • Power off: When not using the tool, make sure the power is off. If you accidentally lean or stand on it, it may start and cause damage
  • Secure attachments: make sure all attachments are securely fixed to the grinder so that they do not fall off when the tool is running
  • Use the right attachment: use only a grinding disc for grinding, cut with a cutting disc essentially, use only a given grinding disc or accessory for the intended use
  • Safeguards: Never try to use tools without a safeguard

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