What to Consider When Choosing the Best Cordless Angle Grinder

Before choosing a grinder, it’s best to learn about the characteristics of the best cordless angle grinder. The following sections include some of the top “need-to-knows” when picking out the best cordless angle grinder for a workshop, a particular project, or a range of other uses. Keep these qualities in mind when comparing models. Motor In cordless angle grinders—and all power tools—manufacturers produce two types of motors: brushed and brushless. Brushed motors have been around longer, while brushless motors are more or less the new school of electric motors. Brushed motors require more maintenance than brushless motors, and because of their design, they are generally less energy efficient. However, they’re also less expensive than brushless motors, so many folks prefer them. Brushless motors require less maintenance, and they have complex onboard electronic controls to modulate their output. These motors offer more power and improved energy efficiency, but they cost more than brushed variants. Which motor to go with depends on the user. For those who don’t mind swapping out brushes every few years and prefer to save money, brushed motors are a good choice. DIYers who want the most power and efficiency they can get may want to check out brushless models. Power and Speed Cordless angle grinders must have the power and speed to complete the job. Power is usually determined by the battery output. Models that use 18-volt or 20-volt batteries offer more power than those that use 9-volt or 12-volt batteries, which allows them to handle heavier-duty tasks, such as cutting metal stock or grinding welds. Speed is also a factor. Angle grinders that offer 8,500 to 10,000 rpm are the most versatile. Speeds in this range allow the user to cut through metal and grind welds quickly. Some models even have variable speeds, allowing the user to modulate battery usage while keeping the metal and grinding disc cooler. Battery Cordless angle grinders use a lot of power, so they must have batteries that can meet their needs. Batteries that can provide 4.0-amp-hours, 5.0-amp-hours, or even 8.0 amp-hours are often the best, as they can power the grinder for a long time before requiring a recharge. Some kits come with two batteries, allowing the user to swap between them when a battery dies. DIYers invested in a specific cordless power tool brand may already have a slew of batteries. They may want to buy a “bare tool” angle grinder that uses those same batteries. These grinders, which are available at a lower price, may be an ideal way to grow a tool kit without making a huge investment. Weight and Ergonomic Design Some cordless angle grinders weigh less than 5 pounds (without the battery), which means a user can comfortably hold and manipulate them for longer periods of time. Angle grinders sometimes have over-molded rubber grips to reduce the amount of vibration the user feels. Multi-positional handles give the user the ability to hold the grinder in the most comfortable, safest position for each task. Disc Size Cordless angle grinders typically come with 4.5-inch discs, which are versatile for most tasks while also being small enough for the grinder to spin quickly. They can cut metal stock, angle iron, and sheet metal, as well as flatten welds and sand paint. Some models can handle larger discs in the 5-inch range. These models are typically brushless and have advanced electronic systems that modulate speed and power output. However, they’re often more expensive than the 4.5-inch disc models. Tool-Free Adjustments Grinding often requires changing angles, grips, and even speeds, so having the ability to make quick adjustments helps production speed. For this reason, many cordless angle grinders offer tool-free adjustments. When changing the angle of the grinder, it’s often necessary to adjust the shield to get it out of the way and protect the user. Many models have small tabs that the user can flip open to facilitate this adjustment. Many tools allow users to adjust the speed with a dial or push-button, which allows them to work carefully and avoid overheating the metal. It also makes grinding and cutting wheels last longer. Additional Features and Accessories While these sections address most of the important features to consider, a few additional characteristics and accessories to consider include: Safety features, such as two-stage triggers, electronic brakes, and kickback brakes, help keep the user safe. Accessory kits come with certain cordless angle grinders that include grinding and cutting wheels, as well as sanding discs and even wire wheels. Carrying bags and cases are also available, allowing users to safely store their cordless angle grinders when not in use and transport them to a project.