Welcome to our article dedicated to the bench grinder. Do you have a lot of dull tips and blades? If you have a workshop or you like DIY and you are one of those who use a lot of saws and drills, you will know how annoying it is to find yourself with cordless bits and blades. What are you doing? Do you buy new tips? It is a waste. The solution to have your tools always ready for use is a bench grinder.
These tools are designed with two wheels or one wheel and one belt sander, ideal for wire recovery from drills, saws and any other tools. They are very powerful and, as they are not very big, you can place them on any table. In this article we want to help you find the bench grinder that best suits your needs. Read on!
- The bench grinders incorporate plastic protections. Without these protections you should never use the equipment, as the sparks could damage your eyes.
- The grinding wheels must always be selected according to the material with which you intend to work. If necessary, you can also replace the wheels with cutting discs.
- When choosing a bench grinder, purchase criteria such as engine power and its RPM (revolutions per minute) should be taken into account. The higher the RPM, the faster the material is removed and the better the sharpening or polishing will be.
The best bench grinders on the market: our selection
With wheels closer together, further apart or with a belt sander, you will find a wide variety of bench grinders on the market. Each of them will better suit a specific space and job. To help you choose the best one for your needs, we have analyzed the market and selected these models:
- The bench grinder of choice for online shoppers
- The best combined bench grinder
- The favorite grinder for DIY enthusiasts
- The cheapest bench grinder
The bench grinder of choice for online shoppers
A versatile and powerful bench grinder. It is a compact model, with 150mm discs and a 150W (watt) electric motor. It has speed adjustment and runs at 2950 RPM.
Two wheels are included in the machine: one fine and one coarse for corrections. The case is made of metal, resistant and with closed side discs and adjustable protection screens.
The best combined bench grinder
Einhell is renowned for producing tools with excellent value for money. In this case we have a combined grinder, with grinding wheel and abrasive belt. It has a 240W motor and the bearing shaft is ball bearing, which allows for more precise work.
It is ideal for soft metals and wood. It has four rubber feet to improve stability and a sturdy metal casing.
The favorite grinder for DIY enthusiasts
The Silverline grinder is a very compact and light model, ideal for your personal workshop. It has a 150W motor and a 150mm shaft. With it you will have enough strength to sharpen tips and blades.
It has two wheels, one of medium grain and the other of fine grain. Includes two large eye protectors, rubber feet to improve stability and steel mounts.
The cheapest bench grinder
This equipment is perfect for domestic and semi-professional jobs. It has a 120W electric motor and 125mm shaft. It has a compact design. It offers a very stable rotation, without jumps, is silent and does not vibrate.
It is ideal for drills, knives and any work on soft materials. It shouldn’t be used until it warms up, but it offers optimal results at an affordable price.
Shopping guide: Everything you should know about the bench grinder
Bench grinders are present in all workshops around the world. They are very versatile tools, as you can use them to sharpen, polish a material or rough up freshly cut pieces. To make a good purchase, you will need to know the tool, so below we explain everything you should know about the bench grinder:
What are the differences between an angle grinder and a bench grinder?
Angle grinders, as we have seen in the article dedicated to them, are hand tools. These should under no circumstances be used to sharpen or work on hand held parts. In this case they are machines designed to cut and bevel corners.
What types of bench grinders are there on the market?
- Grinder: manual cutting machine.
- Angle grinder : when the two axes are perpendicular to each other it is an angle grinder. Manual cutting machine.
- Bench grinder: like the bench grinder.
- Belt grinder: instead of grinding wheels, use a strip of abrasive material.
- Grinding machine : very similar to a milling machine, it is a more complex machine.
- Pipe grinder: specific for pipes.
What are the uses of the bench grinder?
|Roughing and sharpening for cutting tools||It is made with a traditional grinding wheel. Excess material on the edges of a freshly cut piece is removed.
It can also be used to sharpen cutting tools such as saws or blades. In this case, the procedure must be carried out wet, that is, applying a coolant.
|Cleaning of materials||In workshops and factories, parts must be cleaned before anodizing, sandblasting or welding. This process requires the removal of rust, paint and any impurities, leaving the pieces smooth.
In this case the grinding wheel must be replaced by a disc with metal bristles (cardboard or brush).
|Sharpen the twist drills||To sharpen drills or cutters it is better to use a sharpening liquid.
The drill bit must be placed at the right angle on the grinding wheel, then it must be rotated, always with the point in contact with the abrasive material.
This takes some practice, as it is very important to maintain the correct angle of the tip on the material.
|Sharpen hedge trimmer or lawn mower blades||The bench grinder can be used to sharpen the blades of a lawn mower or lawn mower.
Both sides should be evenly sharpened and once finished, balance the blade again.
To balance the blade, excess material must be removed from each side.
|Sharpen chisels and screwdrivers||To sharpen screwdrivers and chisels, the tool must be placed at the correct angle.|
Why are there different types of wheels for bench grinders?
- Deburring: consists of removing metal debris after a cut with a grinder or a miter saw.
- Fine deburring: is the same, but much finer. Cutting in this case is performed with a metal or jigsaw.
- Formatting: is an operation designed to shape metal.
Each finish has a specific purpose. For example, the burr does not form the material, but it removes excess debris (spikes or burrs) and leaves the part smooth. This is why there are different types of wheels:
|Double wheel||Mixed wheel||Grinding wheel for sharpening|
|Form||Two wheels, one at each end of the axis.||Two different systems.||Use adapted speeds and wheels.|
|Speed||They run at the same speed.||The speed of each end can vary.||Use adapted speeds and wheels.|
|Extra||It can be sharpened on the one hand and formatted on the other.||It can be sharpened,
formatted and sharpened in wet.
|Suitable for fine sharpening work.|
Why are there different colored wheels on a bench grinder?
We remind you that, whatever the color, you must not use the wheel to sharpen or deburr soft materials, as it will clog it. The colors of the wheels are as follows:
- Brown: intended for coarse work, especially deburring.
- Gray – for sharpening ordinary steel.
- White: for sharpening tools (knives, scissors, among others).
- Green: Silicon carbide, used for fine sharpening of carbide blades, tips and tools.
How can I sharpen a saw blade or lawn mower with a bench grinder?
- Use a gray wheel to work and retrieve the edge of the object.
- Remember to always keep the correct angle.
- Switch to a white wheel to sharpen the line to the maximum without damaging it.
- Use cold water or some coolant to avoid overheating the metal.
- It is possible to finish the process by bluing or polishing on leather to free the blade of residues and leave it shiny.
What precautions should I take when working with the bench grinder?
- Always check the protective materials of the machine before using it.
- Check that the shafts are properly adjusted and that the wheels do not vibrate or “wobble”.
- Check that the wheels are not too tight, as this could cause problems.
- Make sure the machine shaft rotates on free-play bearings smoothly.
- When you start the grinder, try to increase the revolutions little by little. Never go full throttle.
- At the first start-up, and especially when the wheel is uncovered or not very protected, be very careful to increase the revolutions.
- It is necessary to protect the grinding wheel and especially the discs from blows.
- If one of the discs is cracked or dented, replace it, do not use it as it may explode and cause serious damage.
- Prevent the wheel from overheating during sharpening. This warm-up shouldn’t happen too quickly. If a cold grinding wheel is subjected to rapid and severe stress, it can come off. This is especially important during the winter.
- If you are going to stress the grindstone, try using coarse-grained stones. If the work is continuous, use the shape wheels.
- If you are unfamiliar with sharpening tools, use templates to help you with the correct angle.
- Try to always work with adjustable and robust positioners.
- Above all, to use all personal protective items, especially glasses.
We have already explained everything there is to know about bench grinders and their features. We will now see which factors to take into consideration to buy the equipment that best suits your needs. In the next section of our article you will find a guide with the purchase criteria we consider most important.
- Safety accessories
- Speed regulation
Power is often a determining factor in all power tools. Power is determined by the engine, so more engine, more horsepower and more RPM. The higher the number of revolutions, the higher the working speed, as you will remove more material in less time. Depending on the size of the wheels and the space between them, you can find equipment up to 3600 RPM.
Even for sporadic and domestic use, it is advisable to avoid any equipment with a power lower than 250W, as the grinding wheel could get stuck and cause an accident. For professional use in the workshop or factory, look for a power of over 500W, which guarantees a strong and durable grinder.
The type of wheel you choose will largely determine the jobs you can do with your machine. For example, for home use and low intensity, the best is a simple double wheel, which will allow you to work comfortably with both wheels without problems.
For professional work, it is best to look for a machine with mixed wheels or a belt grinder. These machines, although they are more expensive, are also more versatile and will allow you to do different jobs. For this use you should look for models with the wheels separated from the shaft, to work more comfortably.
The only safety accessory that cannot be missing in your bench grinder are the grinding wheel protection shields. Never buy a tool that doesn’t have these shields. Working without them is very dangerous, as the wheels turn very quickly and when they “eat” the material, they throw waste in all directions.
From here you can search for other accessories that improve the safety of the machine. Some bench grinders have emergency lock or stop systems that stop the units. There are also those with built-in lights that improve visibility while working. Some models include protective eyewear.
As we have already explained, the higher the speed (RPM), the better you will work. This aspect is particularly important for professional jobs. The speed of rotation depends on many things: the power of the motor, the size of the grinding wheel and the distance. A 5 HP bench grinder can reach 12000 rpm, while a ⅓ HP grinder rotates at 3600 rpm.