The Ultimate Buyer's Guide for Purchasing 5 inch angle grinder wheels

When choosing an angle grinder, there are several factors to consider. 

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The most important factor is the type of tasks you'll be using it for. This will influence the size of the angle grinder you buy, its power rating, how portable it is and how easy it is to manoeuvre. For example, a big angle grinder takes bigger discs to make deeper cuts than a smaller one. A high-powered angle grinder is needed for working on dense materials. And it's easier to work up a ladder with a cordless angle grinder than a corded one.

Another consideration is how long you'll need to run the angle grinder for. If you plan to use it for prolonged periods, its weight and power rating are important. For example, you'll want one that's not too heavy. A higher power rating will help get the job done quicker. And a corded angle grinder will run for as long as you need it to.    

Finally, consider how often you'll use the angle grinder. If it's for infrequent DIY use, you probably won't need as much power as a tradesperson who will use the tool frequently. And if you're a tradesperson, durability will be more important. Of course, your budget is also something to consider.

Corded or cordless?

Corded angle grinders plug into the mains electricity supply to work. This gives them unlimited running time and consistent power. They also tend to be lighter than cordless models and cheaper to buy. However, the cord means you need to be near a power supply to use them, so manoeuvrability and portability are hindered. 

Another type of corded angle grinder is an air angle grinder. Instead of being plugged into the electricity, it's connected to an air compressor unit and works using air pressure. They are the lightest angle grinders available and are favoured by metalworkers as they are safe to use when moisture is present. They also have an instant start and stop function.

Cordless angle grinders are powered through a rechargeable battery. This makes them ideal to use where there's no power supply or when working up a ladder or on scaffolding. And there's no cord to get in the way while you work. On the downside, their battery capacity limits their run time, and they are more expensive and heavier than corded models.

Brushed or brushless?

Brushed angle grinders have a motor that&#;s driven by small metal brushes. Whereas brushless angle grinders have a motor with an electronic circuit board and sensor. The absence of brushes on a brushless motor means reduced friction and heat build-up and, therefore, less wear and tear, which gives them a long lifespan. Brushless motors are also more efficient to run than brushed motors.

Angle grinders are common in most enthusiasts&#; garages. They can grind, they can cut, and in a pinch, they can sand. In fact, with the right attachment, they can polish bare metal&#;although we certainly wouldn&#;t want to use one for polishing paint!

All told, there are a few primary uses for angle grinders*:

• Grinding: Obviously, an angle grinder works great for grinding. It allows you to remove excess material and smooth metal easily.
• Cutting: The second most common job of an angle grinder is to make cuts in metal. You can use them in place of a saw, particularly when you need some tool maneuverability. With a saw, you have to move the material to make complex cuts. With an angle grinder, the material can stay in place and you can cut away.
• Sanding and Polishing: With the right attachment, an angle grinder can be used to sand and/or polish metal. Obviously (and as emphasized earlier), you won&#;t be polishing paint or chrome, but it works great for smoothing out bare metal. The key here is the wide range of attachments available.

*They&#;re called &#;angle grinders&#; because of the 90 degree angle of the handle and the head.

What Size Angle Grinder Do You Need?

When it comes to angle grinders, the diameter of the disc is what determines the use.

SummitRacing.com has angle grinders available in four through nine inch disc diameter sizes.

The larger the disc, the greater the cutting depth of the machine. The size of the disc often determines the power of the tool. And of course, the larger the tool, the less maneuverable it becomes. Typically, the smaller grinders operate at high speeds, and of course, they&#;re easier to handle. Larger grinders operate slower (in general) and for the most part, they&#;re easier on discs. Usually angle grinders with bigger disc diameters are also more powerful.

Understanding Angle Grinder Power Sources

There are several different ways a grinder can get its power. The most common grinders are corded options that use typical household 110 volt power or cordless examples with either an 18 or 20 volt rechargeable lithium ion battery. There are also several 60V rechargeable examples along with compressed air powered (pneumatic) versions.

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Some electric grinder models feature brushless motors too, which often means they&#;re more powerful, and over time, perhaps more reliable.

Electric grinders are available in different watt ratings. A higher wattage grinder will provide more power for cutting through thicker materials. If you&#;re going to be using the grinder over a long period of time, then a higher wattage is recommended.

Some grinders are equipped with paddle switches. Some are equipped with basic on-off switches. The paddle switch (or &#;Dead Man Switch&#;) is a safety device that ensures you use two hands to operate the grinder. In addition, some angle grinders are designed with a slow start feature. Here, the speed of the motor slowly increases to full speed,. This prevents the grinder from twisting immediately on start-up. Grinders with an anti-kickback function are designed to stop should the cut-off wheel become bound up.

Angle Grinder Safety

When using grinders, safety is a big issue. Not only does an angle grinder create a lot of flying sparks, it can also throw up debris from the cut. Because of this, safety glasses are a must. Many folks won&#;t operate them without a heavy set of shop gloves. The reason for this is the fact angle grinders mix a high speed spinning motor with a sharp cutting disc&#;a dangerous combo if you&#;re not careful.

Depending on the circumstances and ventilation, the use of a personal dust mask isn&#;t a bad idea either, particularly if you&#;re cutting masonry or ceramics or composites (such as fiberglass or carbon fiber). In close quarters, these materials tend generate considerable dust. Additionally, grinders can also prove to be noisy. As a result, you might want to consider ear protection.

Prior to plugging an angle grinder into a power source, always ensure the machine is switched off&#;and make it a practice to always turn the switch off before you unplug it too.

How to Select the Right Grinding Disc for the Job

It&#;s important to use the right grinding discs (aka grinding wheels) or other attachment for the specific job. The correct disc diameter is obviously important, but so is the right type of disc for the material you&#;re working on. For example, a disc designed for metal won&#;t last long if you&#;re using it on ceramic material. You also run the risk of breaking the disc or damaging the material you&#;re working on when the wrong disc or wheel is used.  

Finally, it&#;s always a good idea to operate an angle grinder with two hands, as they have a tendency to twist if you&#;re not careful. The exception here are the positively tiny pneumatic angle grinders available. They&#;re actually designed to work with one hand.

Popular Angle Grinder Options

A quick trip to SummitRacing.com will reveal dozens of grinder types, including corded, battery powered, and pneumatic options in a huge range of sizes. See the photos below, and you&#;ll get a good idea of what&#;s available.

Check them out&#;because once you have a grinder or two in your shop, you won&#;t know how you worked on cars without them!

This is a Milwaukee Tool 4-1/2 inch corded grinder (part number MWT--30). It incorporates a paddle switch and operates to 11,000 RPM. (Image/Milwaukee Tool) This is a big power 20 volt, cordless, brushless angle grinder from DeWalt (part number DET-DCG416B). It will accept 4-1/2 or 5 inch diameter wheels, and the motor delivers 1,550 max. watts and up to 9,000 RPM. (Image/DeWalt) Here&#;s a 4 inch pneumatic angle grinder from Viking Industries (part number SNI-VT). Typical for air powered tools, the overall size is much smaller than any electric tool. Obviously, that makes it convenient when working in tight quarters. (Image/Summit Racing)

DeWalt makes this 5 inch variable speed corded grinder (part number DET-DWENVS). It operates by way of a paddle switch with five speed settings up to 10,500 RPM. (Image/DeWalt) Need a big cordless grinder? This Milwaukee Tool M18 FUEL grinder accepts 7 to 9 inch discs. It has brushless motor with a maximum speed of 6,600 RPM. It&#;s sold separately, or available in a kit, complete with a battery and charger assembly. (Image/Milwaukee Tool) If you prefer a corded tool, Milwaukee Tool makes this big 9 inch angle grinder (part number MWT--30). It&#;s rated at 15 amps and has a maximum RPM of 6,600. The motor is conventional (with brushes) and it&#;s equipped with a trigger grip. (Image/Milwaukee Tool) Here&#;s a complete 4-1/2 to 6 inch cordless grinder kit from Dewalt. It&#;s based upon a &#;Flexvolt&#; 60 V Max battery arrangement. The tool is brushless and has a maximum no-load speed of 9,000 RPM. Included is a clutch operated kickback brake that shuts down the motor if it detects a pinch or a stall. The complete kit comes with the tool, battery pack, charger and carrying case. (Image/DeWalt) Milwaukee Tool manufactures this 4.5 to 5 inch angle grinder kit. It comes complete with a paddle switch and according to Milwaukee Tool, it can deliver up to 135 cuts on a single charge. Included in the kit are two 18 volt batteries, a charger, a clip-on guard, a side handle as well as a carrying case. (Image/Milwaukee Tool) This grinder from AIRCAT (part number AIT--A) is a 4.5 inch diameter example with a 1 HP rating. It can operate up to 11,000 RPM. The small size and light weight of this tool allows it to be used with one hand. Note the size of the body in relation to the disc size. (Image/AIRCAT)
 

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