Milwaukee 7" / 9" Large Angle Grinder

The Milwaukee 7" / 9" Large Angle Grinder, model number 2785-20, has made a significant impression on me. As a cordless grinder that operates on an 18V battery system, it stands out in a market often dominated by corded options. Having extensively used this tool for a variety of applications, I can confidently share my comprehensive experience.

Design and Build Quality

First and foremost, the build quality of this angle grinder is exceptional. The durable metal housing feels robust and ready to tackle demanding tasks. Weighing in at nearly 12 pounds, it’s not the lightest tool on the market, but it's well-balanced, which aids in handling. The ergonomics are thoughtfully designed, with soft-grip handles and a paddle switch that ensures comfortable and controlled operation.

One of the standout features is the brushless motor. This design choice by Milwaukee allows for efficient power generation and contributes to the tool's overall longevity. The motor maintains consistent speeds under load, which is crucial for tasks that require steady performance, such as cutting through metal or grinding concrete.

Performance and Versatility

Performance-wise, this angle grinder is a powerhouse. It supports both 7" and 9" accessories, making it versatile for various applications. During my testing, I used it for metal cutting, concrete grinding, and surface preparation. Each task was handled with impressive efficiency. The grinder reaches up to 6600 RPM, which is more than adequate for most grinding and cutting jobs.

However, the tool’s impressive power comes with a significant caveat—battery consumption. The grinder is compatible with Milwaukee's M18 battery system, including the high-output (HO) batteries. While the tool-free accessory changes and guard adjustments are convenient, the battery life can be a limiting factor. Even with a fully charged 12.0Ah battery, continuous heavy-duty use will drain the battery quickly. For lighter, intermittent use, the battery lasts longer, but for sustained operations, having multiple batteries on hand is essential.

Battery Management and Heat Issues

Battery management is perhaps the most glaring issue with this tool. In demanding applications, such as cutting concrete or grinding metal, the batteries tend to overheat and shut down. This is particularly problematic with smaller capacity batteries like the 5.0Ah and 8.0Ah, which can overheat in just a couple of minutes under heavy load. The 12.0Ah batteries perform better, but even they struggle with extended use. This is a significant drawback, especially for professionals who need reliable and continuous operation.

Safety and Usability

Safety features on this grinder are commendable. The tool includes overload protection and an electronic clutch, which help prevent motor damage and extend the tool's life. The paddle switch has a line lockout feature, adding an extra layer of safety by ensuring the tool doesn’t start accidentally.

One minor gripe is the absence of an automatic brake. While the grinder does have a controlled start to prevent torque jerk, the lack of an automatic brake means you have to wait for the wheel to come to a complete stop after releasing the trigger. This can be a slight inconvenience, particularly in fast-paced work environments.

Accessories and Additional Features

The grinder comes with a comprehensive set of accessories, including a dust screen to protect the motor from debris, a FIXTEC spindle nut for easy accessory changes without a wrench, and a heavy-duty carrying bag. The bag is spacious and sturdy, capable of holding the tool, batteries, charger, and additional accessories.

Speaking of accessories, the tool-free guard adjustment lever is a practical feature that allows for quick repositioning of the guard. This becomes especially useful when switching between different types of grinding and cutting tasks. However, the grinder does not include a flat flange washer for flat wheels, which can be an inconvenience if you need to purchase it separately.

Durability and Longevity

In terms of durability, the Milwaukee 7" / 9" Large Angle Grinder is built to last. The brushless motor and metal housing are designed to withstand the rigors of industrial use. Despite some issues with the trigger switch mechanism, which appears delicate, the overall construction is solid. Milwaukee’s warranty service is excellent, providing peace of mind should any issues arise.

Final Thoughts

In conclusion, the Milwaukee 7" / 9" Large Angle Grinder is a formidable tool with a few notable drawbacks. Its robust construction, powerful brushless motor, and versatile accessory compatibility make it an excellent choice for various grinding and cutting tasks. However, the tool's heavy battery consumption and the tendency for batteries to overheat under continuous use are significant limitations.

For professionals who require a powerful, cordless grinder and have multiple high-capacity batteries at their disposal, this tool could be a valuable addition to their arsenal. Its performance and convenience in cordless operation outweigh the battery management issues for those who can manage the frequent battery swaps.

On the other hand, for users who need sustained, heavy-duty performance without the hassle of frequent battery changes, a corded grinder might be a more practical choice.

Overall, I would recommend the Milwaukee 7" / 9" Large Angle Grinder for its performance, build quality, and versatility, provided you are prepared to invest in additional batteries and chargers to mitigate the battery life limitations.