Milwaukee 4-1/2" / 5" Grinder

Every once in a while, a tool comes along that redefines your expectations. The Milwaukee 4-1/2" / 5" Grinder (model 2780-22) did just that for me. As a long-time user of Milwaukee's M18 series, I already had high expectations, but this grinder managed to exceed them.

From the moment I unboxed it, the grinder felt sturdy and well-constructed. The packaging included a side handle, a guard, a wrench, a battery, a battery charger, and a contractor’s bag. The first thing that struck me was its weight—at 5.8 lbs, it’s substantial enough to feel robust, yet light enough to maneuver easily, even during extended use.

One of the standout features of this grinder is its brushless motor. This design not only improves efficiency but also significantly extends motor life. I’ve used it for everything from grinding metal to surface preparation and cutting through various materials. The power of the brushless motor is evident in every application. It delivers a consistent 8,500 RPM, which is more than enough for most tasks.

The intelligent electronics integrated into this tool optimize performance and protect against overload, overheating, and over-discharge. These are essential features, especially when you're pushing the tool to its limits. I’ve put this grinder through its paces, running it on heavy-duty tasks, and it never faltered.

Another aspect I appreciated was the tool-free accessory changes and guard adjustments. The FIXTEC nut allows for quick and easy accessory swaps without the need for additional tools. This feature significantly reduces downtime, which is crucial when you’re in the middle of a project. The guard adjustments are also tool-free and can be moved to five different positions for optimal safety and convenience.

The paddle-switch design deserves special mention. Initially, I was skeptical about this feature, mainly because safety switches can sometimes be cumbersome. However, the Milwaukee grinder’s paddle switch is comfortable to operate and provides an added layer of safety. It requires a firm grip to keep it running, which means any accidental release will immediately stop the tool. The safety lock-out mechanism is well-designed, though it takes a bit of getting used to. It’s a small price to pay for the peace of mind it provides.

Ergonomically, the grinder excels. The anti-vibration support handle and the anti-slip grip make it comfortable to use over extended periods. I found that the vibrations were significantly reduced compared to other grinders I’ve used in the past, which made a noticeable difference in reducing hand fatigue.

Battery life is always a concern with cordless tools, but the Milwaukee grinder performs admirably in this regard. While the included 5.0 Ah battery provides ample runtime, I found that using a larger battery like the 9.0 Ah or even the 12.0 Ah offers extended use without a significant increase in weight. The tool's efficiency means you can get a lot of work done on a single charge, and the rapid charger included in the kit ensures you’re not left waiting around for long.

The grinder’s versatility is another highlight. It can accommodate grinding, cutting, and sanding discs, as well as various brush wheels within the 4.5-6 inch range. This makes it a highly utilitarian tool, capable of handling a wide range of jobs without the need to switch between different tools.

However, not everything is perfect. One minor gripe I have is with the disc guard. While it’s easy to adjust, it can sometimes become detached if not secured properly. This is something to be mindful of, especially when storing the tool in a crowded toolbox. Additionally, the instruction manual could be more detailed. While experienced users might find it straightforward, novices could benefit from clearer guidelines.

Despite these minor issues, the Milwaukee 4-1/2" / 5" Grinder stands out as a top-tier tool. Its combination of power, efficiency, and user-friendly features make it a valuable addition to any toolkit. Whether you’re a professional contractor or a DIY enthusiast, this grinder offers the performance and reliability you need.

In conclusion, I wholeheartedly recommend the Milwaukee 4-1/2" / 5" Grinder. Its robust build, powerful brushless motor, intelligent electronics, and ergonomic design make it a standout choice in the cordless grinder market. The convenience of tool-free accessory changes and the added safety of the paddle switch further enhance its appeal. While it’s not without its minor flaws, the overall performance and reliability of this tool make it a worthwhile investment. If you’re in the market for a cordless grinder that can handle a variety of tasks with ease, look no further than the Milwaukee 2780-22.