Milwaukee Braking Die Grinder

When you're working on metal projects, having a reliable and powerful die grinder can make all the difference. Enter the Milwaukee Braking Die Grinder, model 2939-20, a cordless powerhouse designed to offer the performance of a corded tool with the convenience of battery operation. After putting this tool through its paces, I've gathered some insights that I think will be valuable for anyone considering adding this grinder to their toolkit.

Performance and Power

One of the standout features of this grinder is its power. Milwaukee claims it generates the equivalent of 11A corded power, and I found that to be a fair assessment. Whether I was removing weld beads or preparing surfaces, the grinder maintained speed and did not bog down, even when working on thick steel with carbide bits. This level of performance is impressive for a cordless tool and ensures that it can handle demanding tasks without faltering.

Battery Life and Convenience

The grinder is part of Milwaukee's M18 lineup, which means it's compatible with their M18 batteries. I used a range of battery sizes during my testing, from smaller packs to the XC 5.0, and found that the tool performed consistently well across the board. Smaller batteries held up for several minutes of continuous use, which was sufficient for most of my tasks. The convenience of being cordless cannot be overstated; no more dealing with air hoses or extension cords means you can take this grinder anywhere, making it ideal for jobs in remote locations or tight spaces.

Ergonomics and Design

Ergonomically, the grinder is well thought out. It features a barrel grip that fits comfortably in hand, even when wearing gloves. The tool is relatively well-balanced, especially with a battery attached, shifting the center of gravity back to the handle. However, it's worth noting that the grinder is somewhat weighty, which could be a concern for prolonged use. The rubberized nose and handle provide extra control, and the overall build quality feels robust and durable.

Safety Features

Safety is a crucial aspect of any power tool, and Milwaukee has integrated a RAPIDSTOP™ brake that halts the accessory in under two seconds. While it doesn't stop instantly, the braking mechanism is quick enough to enhance safety significantly. This feature is particularly useful when you need to switch tasks quickly or if you accidentally trigger the tool.

Usability

The grinder includes a slide switch that is easily accessible and can be controlled with just a thumb. One standout feature is the locking button, which simplifies the process of changing accessories. You only need one wrench to change out the tooling, which is a small but significant improvement over other models that require two wrenches. However, I did find the button for the locking mechanism to be a bit too inset, making it slightly tricky to manipulate with gloves on.

Drawbacks

Despite its many strengths, the grinder is not without its flaws. Some users have reported issues with battery connections, experiencing wobble and severe vibration, which can make the tool hard to handle. Overheating within a few minutes of use has also been noted, which is concerning for long-term projects. Additionally, the tool does not come with any starter bits or blades, requiring you to purchase these separately before you can start using it.

Final Thoughts

Overall, the Milwaukee Braking Die Grinder is a robust and powerful tool that offers the convenience of cordless operation without sacrificing performance. Its ergonomic design, safety features, and ease of use make it a valuable addition to any workshop, especially for those who frequently work on metal projects. However, the weight and some reported issues with battery connections and overheating are worth considering.

Recommendation

Would I recommend this tool? Yes, I would, but with some reservations. If you're looking for a powerful, cordless die grinder that can handle demanding tasks and you already own Milwaukee M18 batteries, this tool is a fantastic option. Its performance and convenience make it a game-changer for many applications. However, if you plan on using it for extended periods, be mindful of its weight and potential overheating issues. For those new to die grinders or Milwaukee's ecosystem, it might be worth exploring other options or waiting for potential improvements in future models.