Angle grinders are an integral tool for many trades including the steel, automotive, masonry, and landscaping trades. Used for cutting and grinding steel, concrete, stone and masonry, angle grinders require significant power to get the job done. Until recently angle grinders were not considered to be a viable cordless tool. With recent advancements in brushless motors and high capacity batteries most tool manufactures now offer solid cordless angle grinders capable of tasks that previously required a corded tool.
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With the addition of accessories angle grinders are an incredibly versatile jobsite tool that can perform a wide variety of tasks including: sanding and polishing wood, cutting drywall and plaster (with minimal dust) and leveling old concrete floors.
For this Head-to-Head the focus is on the more popular smaller 4-1/2&#; to 6&#; category which is well suited for the cordless platform.
In order to keep the tools in this Head-to-Head somewhat similar each manufacturer was given a range from 18-22 volts, 4-1/2&#; to 6&#; diameter, and battery packs ranging from 5.0 to 6.2 Ah. The following cordless angle grinders were included in the test:
The challenge for any Head-to-Head testing is developing the testing and evaluation criteria in order to create a valuable comparison for users. Obviously there are hundreds of tests that could be performed, however with limited time and resources for this article we chose the following tests as a good baseline comparison.
Each category gets ranked and the results from each are then used to determine and overall winner for the Head-to-Head.
While some of the categories above are subjective, some tests can be measured to give a relative comparison for each tool. As stated earlier, there are literally hundreds of tests that can be done to compare any tool. For this evaluation two tests were selected to give a good relative, measurable comparison including: run-time and performance (speed cutting). While this is an extremely narrow set of tests, we felt it was a good baseline. Clearly run-time is hugely important with high demand cordless tools like grinders, and productivity is always an important benefit to consider when buying any tool so hence the speed of cutting test.
For this evaluation several types of steel and concrete were used in order to get a good perspective on performance. The following materials were included in the testing:
This section of the evaluation considered ten different categories including:
Variable Speed
This is a straight-up comparison of features, a tool gets a &#;1&#; if it has the feature, and a &#;0&#; if it does not. The tool with the highest ranking is the best in this category.
There are few standout features that affect performance and safety. Not all the grinders had these features, and below we listed these &#;stand-out features&#; and the grinders that have them.
Finishing in a tie for first place were the Bosch and Makita grinders. The Bosch illuminated controls were definitely a favorite of our crew and would give it a slight edge over the Makita if we had to choose. Tied for second was DEWALT, Hilti, and Milwaukee. And in third was a tie between Metabo and Metabo HPT.
In an effort to remove as much human user variability in our test results we look to build testing jigs/rigs that provide repeatable and fair test results. This helps eliminate questions about whether or not a tester is pushing harder or holding a tool at a strange angle which might alter the results. However, with limited time and resources it&#;s not possible to build a jig for each of our tests. Below is a list of the testing stations for this Head-to-Head. The first station used a jig, while the remaining two stations used the angle grinders free-hand. The two free hand stations were used to give our testers hands on experience for the subjective rankings in ergonomics.
The three testing stations:
Each grinder used a new Metabo, metal abrasive cut-off disc, and each disc was changed out after 17 cuts.
In this test most of the tools have very similar voltages and battery pack sizes (amp-hours). However, to truly compare them as close as possible, using the total watt-hours (Total available energy) and normalizing the results helps level all of the tools. Watt-hours is simply calculated by multiplying the voltage by the amp-hour rating on the battery pack. In the specification section above we&#;ve listed the Watt-hours for each tool based on the voltage and pack size. Six of the tested tools have watt-hour ratings of 108, so the other results will be normalized to that. For example, Metabo has a watt-hour rating of 99. So the results for Metabo will be factored up by 108/99 or approximately 9%. Metabo has a 5.5 Ah pack, if it had a 6 Ah pack like the others it would more than likely do about 9% more work.
As you can see above DEWALT had the most cuts per charge with 50, followed closely by Metabo with 49, and Hilti with 47. 50 cuts through 5/8&#; rebar with a cordless angle grinder is pretty impressive! Clearly these new generation cordless grinders have the ability to do a serious amount of work per charge and keep up with jobsite demands.
The next test was the performance or speed test. In this test the time to cut 5/8&#; rebar was measured throughout the run-time testing and averaged for each tool to calculate the average cut time for 5/8&#; rebar. These results provide some insight into not only the cordless angle grinders disc speed, but really the combination of torque and speed which results in the overall time to complete the task.
As you can see below Metabo came in first place followed by Milwaukee and Ryobi. Metabo was nearly twice as fast than the Ridgid.
While measuring run-time and cut speeds, the external temperature of each angle grinder was measured using a thermal imaging tool. For high demand cordless tools like grinders, heat can be a big problem. Below is a chart showing the maximum measured temperature for each tool during the cutting tests. The temperatures were not used in scoring but the information is certainly valuable and worth sharing. As the chart shows, the Metabo ran quite a bit cooler than the other grinders at 92 deg. F, and the Makita topped the chart at 125 deg. F.
For the ergonomics evaluation the team evaluated the following: grip, side handle, blade guard, blade guard mount, disc change, power switch, battery change, vibration, balance, maneuverability, and brake speed. For each category, the team ranked them 1, 2 or 3, (1 being the best). For the brake speed we measured the time for the disc to come to a full stop (shown below in the chart), and ranked them 1 for grinders under 1 second, 2 for grinders that stop between 1 and 2 seconds, and 3 for a brake that took longer than 2 seconds.
Much of the ergonomics evaluation came from team members using the grinders at the thin-set and grinding station. Each team member used each grinder grinding thin-set, grinding steel, and cutting steel to get a relative comparison of each tool.
Each category was totaled up (see table below), and the lowest score being the best. As you can see there was a tie for first place between Hilti and Makita. Second place went to Bosch and Milwaukee finished in third.
For this Head-to-Head we&#;re using a different approach with the pricing evaluation. In the past we tried to use kit pricing, and if kit pricing wasn&#;t available, we&#;d use bare tool plus battery pack and charger. That seemed to be a bit inconsistent so this time the pricing is based solely on the bare tool. Every manufacturer offers bare tool pricing so this way the battery pack costs are not a factor.
Below is a chart showing the pricing (at the time of publication) of each of the bare tools. There are three distinct groups, around $100 includes Ryobi, Bosch and Ridgid. Just under $200 is DEWALT, Hilti and Metabo HPT, and the three tools over $200 include Makita, Metabo and Milwaukee. As we always do, these will be ranked on just the cost, as cost is a factor for many users when combined with the other results. Finishing in first place is the Ryobi, followed by Bosch and Ridgid in second, and DEWALT in third.
As usual the Head-to-Head competition was very close but at the end of the Day the Tool Box Buzz Crew must pick a winner and the DEWALT DCG413 is our winner of Best 4-1/2&#; to 6&#; Cordless Angle Grinder.
The DEWALT DCG413 edged out the competition by one point. It finished first in run-time, tied for second in features, third in price, and fourth in ergonomics and speed. Our team felt it was a well balanced, feature filled grinder with plenty of power and run-time to get the job done.
Finishing in a close second was the Bosch GWS18V-45 finishing first in features, second in ergonomics and price, fifth in speed and sixth in run-time. Third place goes to the new Hilti AG 4S-A22 that just hit the market. It finished first in ergonomics, tied for second in features, third in run-time, fourth in price, and seventh in speed.
Below is a summary table of all the final rankings.
Cordless angle grinders are the real deal now! When it comes to smaller size grinders in this category the run-time is sufficient for lots of tasks and when paired with an extra battery most can keep workers in the game all day. The benefits of not dragging around a cord are numerous and the freedom certainly increases productivity and safety.
We get lots of comments about how we make the final rankings. As we&#;ve stated, there are hundreds of ways to compare tools. The good news is we&#;ve openly shared ALL the data from our tests, and you can rank the tools however you want. Don&#;t care about the price? No problem eliminate that from the matrix above and re-rank them. Hopefully you&#;ll find this Head-To-Head useful in comparing a wide range of small cordless angle grinders.
You may think a cordless angle grinder is mainly used for cutting metal, but experienced do-it-yourselfers will find this power tool handy for all kinds of projects. You can buy a variety of different abrasive wheels and cutting wheels that make this a helpful tool when you know how to handle it. When changing the wheels, ensure the tool is powered off and the battery is removed.
So, what are you going to learn in this article?
One of the key advantages of a cordless angle grinder is its portability. Without the encumbrance of a power cord, you can take the tool wherever it's needed, whether you're working at a remote job site or in a home workshop. Furthermore, the angled head design improves your visibility and control over the tool, allowing you to work with greater precision.
Cordless angle grinders are typically equipped with a side handle, which you can use for a two-handed grip. This additional grip enhances stability and control, making it easier and safer to guide the tool through cuts or over a surface. When maneuvering the grinder, always ensure you maintain a firm grip and utilize the safety guard to protect yourself from sparks and debris. The safety features along with precise control provide both efficiency and security in your grinding tasks.
At the heart of many modern cordless angle grinders is a brushless motor, which is more efficient and longer-lasting than traditional brushed motors. This efficiency means more power and a longer runtime on a single battery charge. Among ONEVAN, this 12V 500W Cordless Mini Brushless Angle Grinder is particularly popular and can meet most people&#;s needs for Pipe cutting, equipment maintenance. Hydropower installation, PVC pipe cutting, daily maintenance etc.
When you press the power button, the lithium-ion battery supplies electrical energy to the tool's motor. The motor then converts this electric energy into mechanical energy, causing the grinding wheel or cutting disc to rotate at speeds typically exceeding several thousand RPM. As the grinding wheel spins, you can bring it into contact with the material you're working on. For example, if you're cutting through a metal pipe, the high-speed rotation of the wheel will slice through the pipe due to the abrasive surface of the wheel. Or, if you're using a flap disc, the rotating motion is ideal for polishing and smoothing surfaces such as metal or stone.
One significant difference between the two models is how they get their energy. Although it is self-evident from the names, you can differentiate order from an angle grinder with a wire, which gets its energy from a power outlet.
On the other hand, a cordless angle grinder works on a battery. This rechargeable battery provides energy to the grinder, distinguishing it from corded models. A cordless angle grinder has several significant advantages over corded models, including portability, ease of use in tight spaces, and freedom from tangling cords. Battery-operated angle grinders are easy to carry and operate in confined spaces, such as tight corners or small workshops.
Which is the best cordless angle grinder for you? Your choice depends on several factors, such as:
A polisher and angle grinder are both power tools. Both have round ships and come with spin attachments, which are used to give the finishing touch. However, they have completely different designs.
Angle grinders are built differently. They are aggressive in removing material. Their spinning power is very high, and they also incorporate aggressive discs to green cut or shape metal. You can even use to cut concrete or other metals like aluminum. Interestingly, sheet metal fabrication companies use powerful angle grinders to cut hard metals.
However, as the name sounds, a polisher is a delicate item that spins at a lower speed and uses soft pads and polishing compounds above different services to make them smooth. Car detailing companies commonly use polishers to enhance the shine of vehicle surfaces.
Their appearance is similar; however, both tools are made for totally different purposes.
Angle grinders and polishers have specific roles. As we already discussed, they may appear similar, but their functions are entirely different.
Angle grinders are perfect tools for removing rust, cutting metal, and grinding concrete. They are also used to shape a wide range of custom metal products. As a result, angle grinders excel at completing rough tasks.
For example, the 125mm Brushless Cordless Angle Grinder is known for its efficient, high-precision grinding. It features a durable brushless motor, providing high output and long battery life. The grinder can operate from six gears across a range of speeds between and RPM, offering precise control for different jobs.
Polishers, on the other hand, give a super finishing touch. One of the most common examples is car painters, who use this tool to buff out imperfections. A polisher can also be used in projects involving plastic and wood.
Before using any power tool, it is crucial to read and follow safety guidelines. Since Cordless grinders are powerful tools that can pose serious risks if not used according to safety instructions.
Prioritizing safety is crucial; always wear appropriate personal protective equipment and follow all safety guidelines while operating the grinder.
The company is the world’s best Cordless Angle Grinder Manufacturer supplier. We are your one-stop shop for all needs. Our staff are highly-specialized and will help you find the product you need.
A well-prepared workspace is essential for safe and efficient operation.
Step 1: Charge the battery
Before starting any work, ensure your angle grinder's battery is fully charged. Consult the user manual for instructions on how to charge the battery accurately. Depleting the battery can result in interruptions and possible safety risks.
Step 2: Put on the right wheel or attachment
Grinding: A grinding wheel is made of aluminum oxide or zirconia. It suits most metals, while a diamond grinding wheel is a good choice for cutting concrete.
Cutting: A masonry blade can cut concrete and brick. Subsequently, a cut-off wheel effectively cuts through metal.
Polishing: Choose a polishing pad and recommended compound following your object requirements.
Remember to attach the correct wheel according to the manufacturer's instructions.
Step 3: Secure The Material
Clamp or secure down the material you will be working on where possible so it doesn't move. Securing the material prevents it from moving and reduces the chances of accidents. Use adequate supports or work benches for larger pieces.
Step 4: Power on the grinder
Turn on the angle grinder following instructions from the manufacturer. Ensure your grip on the handle of the tool is firm before starting.
Step 5: Start Grinding, Cutting, or Polishing
Grinding: Maintain constant pressure while moving the grinder in one smooth, controlled motion. Avoid applying too much force, as this can cause the wheel to bind and kick back.
Cutting: Let the wheel do the job; make slow, deliberate cuts. Try to avoid pushing through with force using a grinder.
Polishing: Apply moderate pressure in a circular motion. Overlapping passes may achieve consistent finishings.
Wear proper protective gear all the time you operate the tool.
Step 6: Monitor your Progress and Make necessary Adjustments.
Periodically inspect the workpiece and the condition of the wheel or attachment. If necessary, adjust speed, pressure, or angle based on the material you are working with and the desired finish. Take breaks if you face overheating issues.
Step 7: Power off and Remove debris
Ensure the grinder is turned off and has completely stopped before setting it down. Approach any debris on the work or around it with care.
Step 8: Clean, store tool
Wipe the angle grinder's outer surface using a damp cloth. Remove dust or dirt from air vents. Store the tool in a dry place away from children's reach.
ONEVAN 125mm Grinding Wheel Metal Polishing Sheet Set
Onevan provides a complete package of essential tools for different metalworking projects.
Use Cases:
For instance, our ONEVAN 125mm Grinding Wheel Metal Polishing Sheet Set Cutting Disc includes a wire wheel designed for efficient material removal. It offers a comprehensive solution for all your metalworking needs. This kit consists of a high-performance wire wheel designed especially for heavy-duty tasks such as quickly and accurately removing rust, scale, and old paint from metallic surfaces.
Installation and Safety Tips:Use Cases:
Installation and Safety Tips:
Use Cases:
Use Cases:
Note: Never forget to read the manufacturer's instructions for wheel installation, usage, and safety tips.
Cordless angle grinders are versatile tools essential for cutting, grinding, polishing, and sanding. Proper maintenance and care of your cordless angle grinder are very important to ensure its efficient performance and long service life. Here is a professional guide on maintaining your cordless angle grinder, focusing on routine cleaning and battery upkeep.
1. Regular Inspection: Cordless grinder batteries must be regularly inspected. If you notice any damage to the battery or grinder components, you should replace them.
2. Proper Charging: Use compatible accessories provided by the manufacturer. Also, follow the right charging guidelines. For this purpose, you can read the user manual. Do not overcharge the battery; itcan reduce its life and working efficiency.
3. Storage: IF you are not using cordless angle grinder for a longer time, store the battery in a cool, dry place. Do not expose the battery to extreme temperatures, affecting its performance.
Problem
Possible Cause
Solution
The grinder won't turn on.
Battery not charged
Charge the battery according to the manufacturer's instructions.
The grinder won't turn on.
Faulty battery
Replace a compatible battery.
The grinder loses power quickly.
Worn-out battery
Replace the battery
Grinder overheating
Excessive pressure applied
Reduce pressure and let the grinder to cool down. Take breaks to prevent overheating.
Grinder overheating
Blocked air vents
Clean dust and debris from air vents.
Excessive vibration
Imbalanced wheel
Tighten or replace the wheel.
Bent or damaged wheel
Impact or dropping the grinder
Replace the damaged wheel.
Difficulty controlling grinder
Loose grip
Maintain a firm grip on both handles.
Slow grinding performance
Dull wheel
Use a sharp grinding wheel.
Sparks while grinding
Incorrect wheel type
Use the correct wheel type.
Here are some additional tips to fix common wireless angle grinder issues:
Unusual noises: If your grinder makes strange sounds, it may be a sign of a severe problem. Stop using the tool immediately and call a professional.
Burning smell: Electrical problems or overheating could cause a burning smell. Stop using the tool immediately and let it cool down. If you still smell it, do not use it; take it to an expert mechanic.
Loss of power: Sudden loss of power in grinders can occur for numerous reasons, like breaker tripping, faulty outlet, or issues with the grinder itself. Before proceeding, start by checking your circuit breaker and outlet.
Cordless grinders are a jack of all trades. They can be used for several grinding tasks. In this blog, you have read about the basic understanding of cordless grinders and their main components. Similarly, in which way are grinders and polishers different? After reading the practical steps to use a cordless grinder, you can use this power tool for day-to-day grinding projects.
Can I use a cordless angle grinder for heavy-duty tasks?
To some extent, the answer is yes. However, the battery life typically ranges from 15 to 45 minutes, which may not be sufficient for extended heavy-duty tasks. As you read above, cordless power tools are made for light&#;to medium-duty work, such as metal fabrication, construction, and automotive repair.
How long does the battery last on a cordless angle grinder?
The battery life of a cordless angle grinder typically ranges from 15 to 45 minutes per session However; it depends on the following factors:
What precautions are there to change wheels?
Always unplug the grinder or remove the battery before changing the wheels. You should also wear protective gear. Subsequently, the new wheel or attachment should be securely tightened.
Is it possible to attach a saw blade to a cordless angle grinder?
An angle grinder cannot be fitted with a saw blade. The function of an angle grinder is mainly for grinding, cutting, and polishing.
Is my cordless angle grinder workable in wet conditions?
Avoid operating a cordless angle grinder in damp or wet conditions, as this can lead to tool damage and increase the risk of electric shock. Although particular waterproof models exist, they should not come into contact with water during operation.
How to store my cordless angle grinder?
Angle grinders must be kept in a dry, cool place. The battery must be charged up to 50% before storing it.
Also, follow the given protocols:
What is the spinning direction of the cordless angle grinder?
The angle grinder should turn clockwise when viewed from the side on which a tool is held. This is usually denoted by an arrow on the grinder&#;s body.
What should you NOT cut with a cordless angle grinder?
Avoid cutting through materials that generate a lot of heat, such as thick metals or concrete. Also, don&#;t cut asbestos-containing materials, wet materials, plastic pipes, or ceramic tiles.
Which direction do you cut with a cordless angle grinder?
The material and the kind of cut it requires determine the cutting direction. Usually, the workpiece is fed into the rotating wheel for straight cuts. For bevel cuts, position the grinder accordingly. Be sure to adhere to safety guidelines and follow manufacturer guidelines.
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