The angle grinder is a versatile and powerful tool that has become a staple in metal fabrication, construction, and auto repair. But who can we credit with inventing this handy device?
The answer is not so straightforward, as conflicting stories and claims have emerged over the years. In this article, we’ll explore the history of the angle grinder and try to uncover the truth behind its invention.
Join us as we delve into the origins of this essential tool and discover how it has evolved over time.
Who Invented The Angle Grinder
The story of who invented the angle grinder is a bit murky, with different claims and conflicting information. Some sources suggest that a German company named Ackermann + Schmitt (now FLEX) invented the first high-speed angle grinder in 1954, while others credit a man named Thomas Joseph with inventing the tool in 1973.
Regardless of who can claim credit for inventing the angle grinder, there is no denying that it has become an essential tool in many industries. Its ability to cut, grind, deburr, finish, and polish metal makes it a versatile and valuable addition to any workshop or job site.
Early Origins Of Grinding Tools
The use of stones and other natural abrasives to process materials such as metals has been widespread since ancient times. In ancient Greece, for example, smoothing operations were carried out using these materials. These operations are the basis of what we now call grinding.
Grinding is the most important abrasive application and is involved in the manufacture of almost every product. This use may be direct, as when the product requires pieces that must be made within close dimensional tolerance limits or a very smooth surface, or when used on materials too hard to be machined by conventional cutting tools. Grinding wheels are also used indirectly, for example, to sharpen cutting tools.
The materials that are used to make cutting tools must be hard in order for the cutting tool to cut and retain its sharp edge. Abrasive grinding wheels are the only means for sharpening the dull edges of such tools.
The first grinding machine was invented around the mid-1800s when the metallurgical industry experienced an unprecedented development. While this industry was progressing, new techniques were needed for processing materials that could no longer be carried out by hand. These requirements led to the design and construction of the first grinding machines.
Leonardo Da Vinci also worked on the design of a technology for grinding with automatic advancement and discharge of needles to be rectified. This shows that even centuries ago, people recognized the importance of efficient and accurate grinding techniques.
Emergence Of The Modern Angle Grinder
The first angle grinders invented by Ackermann and Schmitt were heavy and made of solid cast iron. They lacked a mechanism to prevent the spread of force, which made them difficult to handle and required a great deal of effort. However, their invention revolutionized the trade, and the model M6 became a success.
Over time, manufacturers made modifications to the design of angle grinders to make them safer, more durable, lighter in weight, and easier to use. In 1984, a modification in the design allowed angle grinders to be used for more than just rough work. They could also be used for special operations, such as polishing work, stone grinding, and drywall grinding.
Today’s angle grinders are powered by electric motors or compressed air and have an adjustable guard and a side-handle for two-handed operation. They can be used with a wide variety of cutters and attachments, depending on the application. For instance, DeWalt’s 4.5-inch small-angle grinders are ideal for professionals who need to perform a variety of applications in tight spaces such as grinding and beveling steel, grinding welds, cutting pipe and steel plate, and concrete surface prep.
One of the most significant improvements made to modern angle grinders is the redesigned and patented dust-ejection system. This system filters debris from the air, allowing mostly clean air to pass across the motor, leading to longer motor life. With continued advancements in technology and design, it is safe to say that the angle grinder will remain an essential tool for metal fabrication jobs for years to come.
Conflicting Claims Of Invention
There are conflicting claims regarding the invention of the angle grinder. One story credits Ackermann + Schmitt, a German company, with inventing the first high-speed angle grinder in 1954. This innovation was a significant breakthrough, as it allowed for the cutting and grinding of hard materials like stone, concrete, and metal.
On the other hand, some sources suggest that Thomas Joseph invented the angle grinder in 1973. However, this claim is disputed, and there is little information available about Joseph’s invention.
Despite these conflicting claims, it is clear that the angle grinder has revolutionized many industries and become an indispensable tool for metalworking and construction. The tool’s versatility and ability to perform multiple functions make it an essential part of any tradesperson’s toolkit.
The Impact Of The Angle Grinder On Industry
The impact of the angle grinder on industry has been significant. It has revolutionized metal fabrication, construction, and manufacturing by providing a tool that can perform a variety of tasks quickly and efficiently. The availability of different sizes and types of angle grinders, as well as the versatility they offer, has made them a popular choice in various industries.
Electric angle grinders are commonly used in the construction, manufacturing, infrastructure, and utility industries. They are used for cutting, finishing, grinding, and removing excess material from a piece. Masons use them to cut off rebar, commercial contractors use them to cut metal studs, and plumbers use them to cut metal pipes. They are also great for cutting off frozen bolts, trimming down threaded rods, and cutting metal to shape for a variety of weekend projects.
Angle grinders have become standard equipment in metal fabrication shops and construction sites. They have also become popular among DIY enthusiasts due to increasing awareness among consumers in developing economies. This has paved the way for DIY tools in numerous applications, such as non-vehicular products and services.
However, the use of angle grinders also comes with risks. They are amongst the most dangerous tools used in industry and agriculture, with over 5000 documented injuries related to their use each year. Injuries are often triggered by a shattering of the abrasive wheel and are commonly accompanied by suboptimal health and safety standards. This highlights the importance of proper training and safety measures when using angle grinders.
Despite the risks associated with their use, the impact of angle grinders on industry cannot be denied. Their ability to perform a variety of tasks quickly and efficiently has made them an essential tool in many industries. As technology continues to advance, we can expect to see further developments in angle grinder design and functionality that will continue to shape their impact on industry.
Innovations And Advancements In Angle Grinder Technology
Over the years, the angle grinder has undergone significant advancements and innovations in technology. One of the most significant safety innovations in the industry was introduced by Metabo in 1966 – the S-automatic safety clutch. This invention protected operators from excessive kickback, which is one of the biggest safety concerns when using angle grinders. The safety slip clutch allowed slippage if the wheel or disc would bind in the material, reducing the reaction torque and allowing the operator to remain in control of the tool. The clutch also helped to prevent the wheel from shattering by limiting the torque built up within the tool.
In 2012, Metabo developed another important safety feature – the mechanical brake on the angle grinder. This brake stops the wheel or disc within 2 seconds, preventing injury that might result from a spinning wheel. Tethering of tools is also gaining traction as a safety measure, and Metabo has developed a solution for this as well.
On the ergonomics side, Metabo has made significant strides in reducing vibration and making the tool more comfortable to operate longer without fatigue. They started developing anti-vibration technology in the early 2000s, and in later years, they developed an auto-balance feature built onto the spindle of the tool that helped to offset vibration created by accessories. The side handle design on Metabo’s angle grinder is also offset 15 degrees to the front, making it more comfortable to operate and preventing issues like carpal tunnel syndrome.
Another recent innovation in angle grinder technology is advancements in lithium-ion battery technology. This has expanded the many uses of angle grinders dramatically, making them an even more versatile tool used by a wide range of professionals.
Finally, compressed air-powered turbine angle-grinders have emerged as a convincing alternative to conventional devices due to their incredibly favorable power-to-weight ratio (kW/kg). DEPRAG INDUSTRIAL has extended their range of innovative turbine angle-grinders to include nine different types of tools that are lighter and cause less stress on workers, thus increasing productivity.
Safety Tips For Using An Angle Grinder
Using an angle grinder can be dangerous if proper safety precautions are not taken. Here are some important safety tips to keep in mind when using an angle grinder:
1. Wear appropriate Personal Protective Equipment (PPE): Always wear wide vision goggles, safety glasses, or a face shield to protect your eyes from flying debris. Wear leather gloves, natural fiber clothing, and an apron to protect your skin from sparks and hot particles. A dust mask or respirator is recommended if working with masonry materials as the dust can be inhaled.
2. Maintain good footing, balance & work position: Ensure that you have good footing, balance, and a stable work position while using an angle grinder. Avoid working on slippery or uneven surfaces.
3. Avoid flammable areas: Never use an angle grinder near anything that can catch fire. Keep flammable items such as aerosol or gas cans and oily rags at a safe distance.
4. Use the correct RPM: Every grinding disc, wire wheel, etc. should have the maximum recommended RPM noted on the face of the abrasive, packaging, and/or the product description. Never use an abrasive tool that has a lower recommended RPM than your angle grinder is capable of spinning at.
5. Start slow: Start with the low speed setting on your angle grinder and gradually increase it as needed. Avoid using a speed that’s faster than the maximum Rotations Per Minute (RPM) as specified by the manufacturer.
6. Do not clamp portable grinders in a vise for grinding hand-held work: This can cause the grinder to become unstable and increase the risk of injury.
7. Do not force wheels onto a grinder that is the wrong size or change mounting hole sizes: This can cause the wheel to break or shatter during use.
8. Do not tighten the mounting nut excessively: Over-tightening can cause the wheel to crack or break during use.
9. Do not put the grinder on the floor or working surface until the wheel has stopped turning: This can cause the grinder to tip over and increase the risk of injury.
10. Do not wear loose clothing or dangling jewelry: Loose clothing or jewelry can get caught in the moving parts of the grinder, causing injury.
By following these safety tips, you can ensure that you use an angle grinder safely and effectively. Remember that proper safety precautions should always be taken when working with any power tool to prevent injury or accidents.