Milwaukee M18 FUEL™ 4-1/2" / 5" Braking Grinder with ONE-KEY™ Slide Switch, Lock-On

Opening the packaging of the Milwaukee M18 FUEL™ Braking Grinder was like unwrapping a box of potential. With each piece neatly organized, it was immediately clear that this tool was designed with precision and user convenience in mind. The design and layout spoke volumes about the thought and care put into crafting not just a tool, but a reliable companion for various grinding and cutting tasks.

One of the standout features of this grinder is its brushless motor, which cranks up to an impressive 8,500 RPM. This high-speed operation ensures that grinding and cutting tasks are performed efficiently and swiftly. Whether you're working with metal, stone, or concrete, the power delivered by this motor feels comparable to some of the best corded grinders on the market. The efficiency of the motor is further boosted by Milwaukee’s advanced electronic system, which optimizes performance and battery life.

Speaking of battery life, the M18 FUEL™ grinder comes equipped with Milwaukee's XC6.0 high output batteries. These batteries not only provide ample power but also extend the tool's operating time significantly. I found that even during prolonged use, the grinder maintained its performance without overheating, thanks to the effective energy management system in place. The balance of the tool with the battery attached is well-designed, alleviating fatigue during extended work sessions.

Safety is a critical consideration in power tools, and Milwaukee has not skimped on this front. The RAPIDSTOP™ brake is an impressive feature that halts the accessory within two seconds of releasing the switch. This rapid braking mechanism not only enhances safety but also saves valuable time between cuts. Paired with the electronic clutch that offers kickback protection, this grinder feels safer to operate compared to many other models in the market.

The slide switch design is another thoughtful addition, minimizing user fatigue and providing a more comfortable grip. I much prefer this over the paddle switch, as it offers more controlled and precise operation. The switch is responsive and can be locked in position, providing peace of mind that the tool won’t accidentally power off during use. Additionally, the tool-free guard adjustment and accessory changes are a breeze, thanks to the integrated FIXTEC technology. This user-friendly design means less downtime and more productivity.

In terms of build quality, the grinder is robust and feels durable in hand. The use of pressure-molded glass fiber reinforced polyvinylidene fluoride and heat-formed styrene-butadiene rubber wrap provides a solid grip and resistance to wear and tear. The tool’s weight, while slightly on the heavier side, feels justified given the sturdy construction and the powerful performance it delivers. The side handle is well-insulated from vibrations, adding to the overall comfort during use.

One of the most impressive aspects of this grinder is its versatility. It can accommodate both 4-1/2 inch and 5-inch wheels, making it suitable for a wide range of applications. The included guards are easy to adjust and switch between, providing flexibility depending on the task at hand. The spindle, a standard 5/8"-11, showcases fine machining quality, ensuring smooth operation and longevity.

The ONE-KEY™ feature is a notable inclusion, offering the ability to track and manage the tool via a smartphone app. This is particularly beneficial for professionals who need to keep tabs on their tools and manage inventory efficiently. The added layer of security and the ability to quickly locate the tool if misplaced is a valuable feature that adds to the grinder’s overall appeal.

However, no tool is without its downsides. The weight of the grinder, especially with the larger XC6.0 batteries, can become a bit cumbersome during extended use. While the performance and power justify the heft, it’s something to consider if you’re going to be using this tool for prolonged periods. The inclusion of a belt hook would have been a nice touch to improve portability further.

Another minor critique is the depth of the guard, which can get in the way when using cup wheels. While not a deal-breaker, it does require a bit of adjustment and planning to work around it effectively. Additionally, while the battery life is generally impressive, heavy-duty tasks do tend to drain the batteries quicker, so having a spare set on hand is advisable.

Despite these minor drawbacks, the Milwaukee M18 FUEL™ grinder impresses with its performance, build quality, and user-friendly features. The rapid braking system, advanced electronic clutch, and robust motor combine to make this tool a powerhouse in its category. Whether you’re a professional or a serious DIY enthusiast, this grinder offers the reliability and efficiency needed for demanding tasks.

Overall, I highly recommend the Milwaukee M18 FUEL™ Braking Grinder. Its blend of power, safety features, and advanced technology make it a standout choice for anyone in need of a high-performance cordless grinder. The slight increase in weight is a small trade-off for the significant benefits it offers, making it a worthy investment for your toolkit.