What Does an Angle Grinder Do?
Angle grinders are used for a variety of workshop and jobsite tasks including cutting metal and stone, grinding, sanding, and polishing materials that otherwise would be difficult to work on. With the numerous attachments and abrasive wheels to choose from, you can handle almost any task including sharpening blades.
These tools get their name from the 90° angle of the disc on the tool when you hold it while working. The disc sits on a threaded shaft and is kept in place with a clamping nut. These discs rotate at high speeds to accomplish the desired result, be it grinding metal or removing rust. All grinders have the same basic setup, with a molded handle, either a slide or paddle switch, motor, side handle, disc and guard.
Sliding Switch vs. Paddle Switch
There are two main types of angle grinders, either a sliding switch or a paddle (or trigger) switch.
Slide switches are like the standard on/off switch and are located on the top or side of the tool. Moving the switch to the “On” setting turns the power on to the grinder and remains running until the switch is returned to the “Off” setting.
Paddle switches (or trigger switches) are located along the handle of your grinder. Depressing the paddle will turn the grinder on until the switch is released, stopping the motor and disc instantly.
A majority of users prefer the paddle switch for its safety and control features. For example, if you drop your paddle switch grinder, the disc stops immediately, avoiding potential damage to the work material or yourself. One drawback is having to hold the grinder in unusual positions for long periods of time. Keeping the paddle pressed while using welder’s gloves can be an issue also.
Slide switches don’t have the trigger for power, so the grinder is running constantly. This can be a concern if the tool is dropped.
Angle Grinder Sizes
Grinders come in different sizes for differing tasks. Below are some of the most common grinder options.
4.5 Inch
4.5-inch angle grinders (115mm) are so named due to the diameter size of discs they will use. Lightweight and easy to handle, they are a solid choice for exacting completion tasks. Some of the work this small angle grinder is best suited for is cutting tile, filing a new edge on blades, and working on elaborate designs. 4.5-inch angle grinders can cut to a depth of 1-1/8 inches and do best for small work areas rather than larger pieces.
5 Inch
5-inch angle grinders (125mm) use 5-inch diameter discs. A step up in size from the smaller 4.5-inch angle grinders, they can cut to a depth of 1-1/2-inches and are best for regular scale tasks like cutting metal, grinding, deburring, and sanding and polishing.
9 Inch
As the heavyweight of the group, 9-inch angle grinders (230mm) are the most powerful to use. This also means they are the most cumbersome to work with. 9-inch grinders are the construction jobsite choice thanks to their ability to cut depths up to 2-3/4-inches in materials like metal, brick and masonry. They are also good to deburr and smooth out weld beads.
The higher the wattage of your grinder, the more power it’ll have ready for use. The larger the wheel or disc on your grinder, the more power you need, thus a higher wattage is necessary.
What Materials Can an Angle Grinder Cut?
In addition to cleaning and polishing metal, there are also cutting abilities that these tools can do. Using a diamond blade will enable you to cut through stone, reinforced concrete, brick and other masonry. This blades can also cut through aluminum, stainless steel, cast iron and steel. Regular cutting discs will go through plastics, wood, ceramics and tile. It is important to match the right cutting disc with the right material you are cutting.
Angle Grinder Safety
- Always wear protective clothing such as safety eyewear, ear muffs, gloves and a dust mask.
- When using a corded angle grinder, make sure the switch is turned off before plugging it in.
- Use the proper disc for your project and materials.
- Always use the safety guard for added protection.
- Always use both hands to control the angle grinder.
Tool Rental
Maybe you just need an angle grinder or other tools for a day or two. If so, the tool rental program at select Lowe’s stores can be just the thing to keep you projects on schedule. You can rent the same commercial-grade tools and equipment many professionals choose to buy, without the high cost associated with purchasing new. Plus, with a rental, you don't have to worry about maintenance or storage.