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Cordless Angle Grinder Lineup
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In order to keep the tools in this Head-to-Head somewhat similar each manufacturer was given a range from 18-22 volts, 4-1/2" to 5" diameter, and battery packs ranging from 5.0 to 6.2 Ah. The following cordless angle grinders were included in the test:
Bosch GWS18V-45 - Bosch 18V EC Brushless Connected 4-1/2 Inch Angle Grinder with No Lock-On Paddle Switch
DEWALT DCG413 - DEWALT 4-1/2 Inch 20V MAX XR Paddle Switch Small Angle Grinder with Kickback Brake
Hilti AG 4S-A22 - Hilti AG 4S-A22 4-1/2 Inch 22V Cordless Brushless Angle Grinder with Kwik Lock
Makita XAG21ZU - Makita 18V Brushless Cordless 4-1/2" / 5" Paddle Switch Cut-Off/Angle Grinder with Electric Brake and AWS
Metabo WPB 18 LTX BL 115 - Metabo 18V 4-1/2 Inch Brushless Cordless Angle Grinder
Metabo HPT G18DBAL - Metabo HPT 18V Brushless 4-1/2" Angle Grinder
Milwaukee 2980 - Milwaukee M18 FUEL 4-1/2"/6" Braking Grinder with No-Lock Paddle Switch
Ridgid R86042B - Ridgid Brushless 18V 4-1/2 Inch Angle Grinder
Ryobi P423 - Ryobi 18V ONE+ Brushless 4-1/2 Inch Cut-Off Tool /
Grinder
Cordless Angle Grinder Testing Criteria
While some of the categories above are subjective, some tests can be measured to give a relative comparison for each tool. As stated earlier, there are literally hundreds of tests that can be done to compare any tool. For this evaluation two tests were selected to give a good relative, measurable comparison including: run-time and performance (speed cutting). While this is an extremely narrow set of tests, we felt it was a good baseline. Clearly run-time is hugely important with high demand cordless tools like grinders, and productivity is always an important benefit to consider when buying any tool so hence the speed of cutting test.
Cordless Angle Grinder Testing Stations
In an effort to remove as much human user variability in our test results we look to build testing jigs/rigs that provide repeatable and fair test results. This helps eliminate questions about whether or not a tester is pushing harder or holding a tool at a strange angle which might alter the results.
The three testing stations:
Performance Rebar Cutting Sled: The cutting sled removes the human element with regard to the cutting angle, and pressure. The sled was used for both the run-time calculations and the performance (cutting speed) when cutting 5/8” rebar. The sled was designed to hold each cordless grinder with the cutting disc 90 degrees to the rebar.
Removal of Thin Set from CMU Block– Testers used the cordless angle grinders to remove thin set mortar from CMU blocks with a grinding wheel. A diamond cup grinding disc with dust shrouds, attached to a Bosch HEPA vacuum was used.
Steel Grinding – The crew used the cordless angle grinders to remove surface material from a steel angle. Again this gave the crew increased “hands on” with grinding and polishing for further evaluation.
